Eckhardt Advances in Turbulence XII

Proceedings of the 12th EUROMECH European Turbulence Conference, September 7-10, 2009, Marburg, Germany
1. Auflage 2010
ISBN: 978-3-642-03085-7
Verlag: Springer
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 973 Seiten

Autoren/Hrsg.

Eckhardt, Bruno

Inhaltsverzeichnis

1;Advances in Turbulence XII;3
1.1;Preface;5
1.2;Contents;7
1.3;Part I Lagrangian aspects;28
1.3.1;Lagrangian modeling and properties of particles with inertia;29
1.3.1.1;1 Lagrangian structure functions;31
1.3.1.2;2 Finite particle size;33
1.3.1.3;3 Conclusions;34
1.3.1.4;References;35
1.3.2;Effect of Fax´en forces on acceleration statisticsof material particles in turbulent flow;37
1.3.2.1;Lagrangian models for particle dynamics;37
1.3.2.2;Eulerian-Lagrangian Numerical simulations;38
1.3.2.3;Results;38
1.3.2.4;References;40
1.3.3;Lagrangian analysis of turbulent convection;41
1.3.3.1;1 Introduction;41
1.3.3.2;2 Lagrangian particle dispersion;41
1.3.3.3;3 Heat transport and acceleration;42
1.3.3.4;References;44
1.3.4;Linear and angular dynamics of an inertial particle in turbulence;45
1.3.4.1;Experimental setup and method;45
1.3.4.2;Linear motion;46
1.3.4.3;Angular dynamics;47
1.3.4.4;References;48
1.3.5;Collision rate between heavy particles in a model turbulent flow;49
1.3.5.1;1 Introduction;49
1.3.5.2;2 Direct measurements;50
1.3.5.3;3 Indirect estimation;51
1.3.5.4;References;52
1.3.6;From cloud condensation nuclei to cloud droplets: a turbulent model;53
1.3.6.1;Introduction;53
1.3.6.2;Model;54
1.3.6.3;Results;55
1.3.6.4;References;55
1.3.7;Lagrangian statistics of inertial particles in turbulent flow;57
1.3.7.1;References;60
1.3.8;Lagrangian statistics of two–dimensional turbulence in a square container;61
1.3.8.1;References;64
1.3.9;Measurement of Lagrangian Particle Trajectories by Digital in-line Holography;65
1.3.9.1;1 Introduction;65
1.3.9.2;2 Hologram recording and reconstruction;66
1.3.9.3;3 Particle detection, validation and tracking;67
1.3.9.4;4 Conclusions;67
1.3.9.5;References;68
1.3.10;3-D Particle Tracking Velocimetry (PTV) in gas flows using coloured tracer particles;69
1.3.10.1;References;72
1.3.11;Two-particle dispersion in 2D inverse cascadeturbulence and its telegraph equation model;73
1.3.11.1;1 Introduction;73
1.3.11.2;2 Results and Discussion;74
1.3.11.3;References;76
1.3.12;Numerical simulations of particle dispersion in stratfied flows;77
1.3.12.1;1 introduction;77
1.3.12.2;2 Numerical simulations and results;78
1.3.12.3;3 Conclusions;80
1.3.12.4;References;81
1.4;Part II Instability and Transition;82
1.4.1;Experimental study of the von Kármán flow from Re = 102 to 106: spontaneous symmetry breaking and turbulent bifurcations;83
1.4.1.1;1 Effect of the Reynolds number: onset of multistability;84
1.4.1.2;2 Controlled Rp-symmetry breaking;85
1.4.1.3;3 Conclusion;86
1.4.1.4;References;86
1.4.2;Flow reversals in a vertical channel;87
1.4.2.1;References;89
1.4.3;Linear Instability of Streamwise Corner Flow;90
1.4.3.1;References;93
1.4.4;DNS of turbulent plane Couette flow with emphasis on turbulent stripe;94
1.4.4.1;1 Introduction;94
1.4.4.2;2 Numerical conditions;94
1.4.4.3;3 Results and discussion;95
1.4.4.4;4 Conclusion;97
1.4.4.5;References;97
1.4.5;Geometry of state space in plane Couette flow;98
1.4.5.1;References;101
1.4.6;Linear and nonlinear instabilities of slidingCouette flow;102
1.4.6.1;1 Introduction;102
1.4.6.2;2 Formulation and Numerical Methods;103
1.4.6.3;3 Results and Discussion;103
1.4.6.3.1;3.1 Linear Analysis;103
1.4.6.3.2;3.2 Nonlinear analysis;103
1.4.6.4;References;105
1.4.7;Localization in plane Couette edge dynamics;106
1.4.7.1;References;107
1.4.8;Nonlinear optimal perturbations in plane Couette flow;108
1.4.8.1;References;111
1.4.9;Order parameter in laminar-turbulent patterns;112
1.4.9.1;References;113
1.4.10;Pattern formation in low Reynolds number plane Couette flow;115
1.4.10.1;References;118
1.4.11;Quasi-stationary and chaotic convection in lowrotating spherical shells;119
1.4.11.1;References;121
1.4.12;Linear stability of 2D rough channels;124
1.4.12.1;1 Introduction;124
1.4.12.2;2 Results;125
1.4.12.3;3 Conclusions;127
1.4.12.4;4 References;127
1.4.13;Transient turbulent bursting in enclosed flows;128
1.4.13.1;1 Introduction;128
1.4.13.2;2 Experimental setup;128
1.4.13.3;3 Results;129
1.4.13.4;4 Conclusion and outlook;131
1.4.13.5;References;131
1.4.14;On New Localized Vortex Solutions in the Couette-Ekman Layer;132
1.4.14.1;References;135
1.4.15;Shear instabilities in Taylor-Couette flow;136
1.4.15.1;1 Formulation;136
1.4.15.2;2 Subcritical equilibria from modal instabilities of Couette flow;137
1.4.15.3;3 Intermittent regimes from nonmodal instabilities;138
1.4.15.4;References;139
1.4.16;Particle Tracking Velocimetry in Transitional Plane Couette Flow;140
1.4.16.1;References;143
1.4.17;Experimental study of coherent structures in turbulent pipe flow;144
1.4.17.1;References;145
1.4.18;Forced localized turbulence in pipe flows;146
1.4.18.1;1 Introduction;146
1.4.18.2;2 Formulation;146
1.4.18.3;3 The turbulent puff: mean flow;147
1.4.18.4;4 Localized forcing;148
1.4.18.5;References;149
1.4.19;From localized to expanding turbulence;150
1.4.19.1;References;151
1.4.20;Influence of test-rigs on the laminar-to-turbulent transition of pipe flows;152
1.4.20.1;Abstract;152
1.4.20.2;1 Introduction and Aim of Work;152
1.4.20.3;2 Effects of Nozzle on Pipe Inlet Turbulence;154
1.4.20.4;3 Design Strategy for New Test Rig and Experiments;154
1.4.20.5;References;155
1.4.21;Interaction of turbulent spots in pipe flow;156
1.4.21.1;References;157
1.4.22;Large-scale transitional dynamics in pipe flow;158
1.4.22.1;References;161
1.4.23;Nonlinear coherent structures in a square duct;162
1.4.23.1;Introduction;162
1.4.23.2;Definitions;162
1.4.23.3;Results;163
1.4.23.4;Conclusions;164
1.4.23.5;References;165
1.4.24;Quantitative measurement of the life time ofturbulence in pipe flow;166
1.4.24.1;References;169
1.4.25;Experimental investigation of turbulent patch evolution in spatially steady boundary layers;170
1.4.25.1;References;171
1.4.26;Interaction of noise disturbances and streamwise streaks;172
1.4.26.1;References;175
1.4.27;Linear generation of multiple time scales by 3D unstable perturbations;176
1.4.27.1;References;179
1.4.28;Convection at very high Rayleigh number: signature of transition from a micro-thermometer inside the flow;180
1.4.28.1;1 Introduction;180
1.4.28.2;2 Micron-size thermometer;180
1.4.28.3;3 Results and interpretation;182
1.4.28.4;4 Conclusion;183
1.4.28.5;References;183
1.4.29;Estimating local instabilities for irregular flows in the differentially heated rotating annulus;184
1.4.29.1;1 Introduction;184
1.4.29.2;2 Motivation and test case;184
1.4.29.2.1;2.1 Growing modes in stable systems;184
1.4.29.2.2;2.2 Estimating the propagator from data;185
1.4.29.3;3 Thermally driven rotating annulus;186
1.4.29.3.1;3.1 Estimating growing patterns of the rotating annulus flow;187
1.4.29.4;4 Conclusion and future work;187
1.4.29.5;References;187
1.4.30;Search for the “ultimate state” in turbulent Rayleigh-B´enard convection;188
1.4.30.1;References;189
1.4.31;Rayleigh–Taylor instability in two dimensions and phase-field method;190
1.4.31.1;1 System configuration and phase-field description;190
1.4.31.2;2 Numerical investigation;192
1.4.31.3;3 Conclusions;193
1.4.31.4;References;193
1.4.32;Split energy cascade in quasi-2D turbulence;194
1.4.32.1;References;196
1.4.33;Stabililty and laminarisation of turbulent rotating channel flow;197
1.4.33.1;References;198
1.4.34;The vortical flow pattern exhibited by thechannel flow on a rotating system just pasttransition under the influence of the Coriolisforce;199
1.4.34.1;1 Introduction and scope of the work;199
1.4.34.2;2 The equations, the ansatz and the procedure for theirsolution;199
1.4.34.3;References;202
1.4.35;Transient evolution and high stratification scaling in horizontal mixing layers;203
1.4.35.1;1 Introduccion;203
1.4.35.2;2 Formulation and Methods;204
1.4.35.3;3 Results and Discussion;206
1.4.35.4;References;206
1.5;Part III Control of turbulent flows;207
1.5.1;Toward Cost-effective Control of Wall Turbulence for Skin Friction Drag Reduction;208
1.5.1.1;Abstract;208
1.5.1.2;1 Introduction;208
1.5.1.3;2 Fundamental Concepts;210
1.5.1.3.1;2.1 Control Performance Indices;210
1.5.1.3.2;2.2 Theoretical Constraint;211
1.5.1.3.3;2.3 Toward Control of High Reynolds Number Flows;212
1.5.1.4;3 Feedback Control;213
1.5.1.4.1;3.1 Control Algorithms with Wall Sensors;213
1.5.1.4.2;3.2 Power Saving with Selective Space/Scale Control;214
1.5.1.5;4 Predetermined Control;215
1.5.1.6;5 Conclusions and Challenges for the Future;218
1.5.1.7;Acknowledgements;218
1.5.1.8;References;219
1.5.2;Active control of turbulent boundary layer using an array of piezo-ceramic actuators;220
1.5.2.1;1 Introduction;220
1.5.2.2;2 Experimental Details;221
1.5.2.3;3 Results and Discussion;222
1.5.2.4;4 Conclusion;223
1.5.2.5;Acknowledgement;223
1.5.2.6;References;223
1.5.3;Flat plate turbulent boundary-layer control using vertical LEBUs;224
1.5.3.1;References;227
1.5.4;Estimation of the spanwise wall shear stress based on upstream information for wall turbulence control;228
1.5.4.1;References;231
1.5.5;Interactions between vortex generators and a flat plate boundary layer. Application to the control of separated flows.;232
1.5.5.1;References;235
1.5.6;Modulated global mode of a controlled wake;236
1.5.6.1;1 Introduction;236
1.5.6.2;2 Experiment;237
1.5.6.3;3 Results and discussion;237
1.5.6.4;4 Conclusion;239
1.5.6.5;5 Acknowledgements;239
1.5.6.6;References;239
1.5.7;Swirl effects in turbulent pipe flow;240
1.5.7.1;1 Introduction;240
1.5.7.2;2 Results;241
1.5.7.3;References;243
1.5.8;Control of an axisymmetric turbulent wake by a pulsed jet;244
1.5.8.1;1 Introduction;244
1.5.8.2;2 Experimental Setup;245
1.5.8.3;3 Results;245
1.5.8.4;4 Discussion;246
1.5.8.5;References;247
1.5.9;Direct Numerical Simulations of turbulent mixed convection in enclosures with heated obstacles;248
1.5.9.1;1 Introduction;248
1.5.9.2;2 Governing equations and numerical method;248
1.5.9.3;3 Results;250
1.5.9.4;4 Acknowledgements;251
1.5.9.5;References;251
1.5.10;On Drag Reduction in Turbulent Channel Flow over Superhydrophobic Surfaces;252
1.5.10.1;1 Introduction;252
1.5.10.2;2 Superhydrophobic surfaces;252
1.5.10.3;3 Experimental methods and determination of u*;253
1.5.10.4;4 Results and Discussion;254
1.5.10.5;References;255
1.5.11;Response of Periodically ModulatedTurbulence;256
1.5.11.1;References;258
1.5.12;Turbulent drag reduction by feedback: aWiener- ltering approach;259
1.5.12.1;References;263
1.6;Part IV Vortex dynamics and structure formation;265
1.6.1;A driving mechanism of turbulent puff in pipe flow;266
1.6.1.1;Introduction;266
1.6.1.2;DNS of Pipe Flow;266
1.6.1.3;Equilibrium puff;267
1.6.1.4;Low-speed streaks and KH instability;268
1.6.1.5;Self-Sustenance Cycle;269
1.6.1.6;References;269
1.6.2;Wavelet tools to study vortex burstingand turbulence production;270
1.6.2.1;Acknowledgements;271
1.6.2.2;References;273
1.6.3;The minimum-enstrophy principle for decaying 2D turbulence in circular domains;274
1.6.3.1;Introduction;274
1.6.3.2;Set-up of the numerical simulations;274
1.6.3.3;Decaying 2D turbulence: late-time flow patterns;275
1.6.3.4;Conclusions;277
1.6.3.5;References;277
1.6.4;Direct numerical simulation of a turbulent vortex ring;278
1.6.4.1;1 Introduction;278
1.6.4.2;2 Numerical procedure;278
1.6.4.3;3 Results;279
1.6.4.4;References;281
1.6.5;Reconnection of vortex bundles;282
1.6.5.1;References;285
1.6.6;Turbulent energy cascade caused by vortex stretching;286
1.6.6.1;References;289
1.6.7;Instabilities and transient growth of trailing vortices in stratified fluid;290
1.6.7.1;1 Introduction;290
1.6.7.2;2 2-D Evolution of the base flow in a stratified fluid;290
1.6.7.3;3 Quasy-steady approximation for the stability of theflow.;291
1.6.7.4;4 Optimal perturbations;292
1.6.7.5;References;293
1.6.8;mplementation of Vor tex Str etching into the T wo-Dimensional N avier -Stokes E quations via Ar bitr ar y E xter nal Str aining;294
1.6.8.1;1 Abstract;294
1.6.8.2;2 I ntr oduction and mathematical for mulation;294
1.6.8.3;3 Applications;296
1.6.8.3.1;3.1 Isotropic decaying turbulence;296
1.6.8.3.2;3.2 Near–wall flow;297
1.6.8.3.3;References;297
1.6.9;Turbulent cascade of a quantum fluid at finitetemperature;298
1.6.9.1;1 Introduction : Motivation and Model;298
1.6.9.2;2 Numerical aspects;299
1.6.9.3;3 Results;299
1.6.9.4;4 Conclusion;301
1.6.9.5;Acknowledgements;301
1.6.9.6;References;301
1.6.10;Visualization of quantum turbulence in 3He-B by thermal excitations;302
1.6.10.1;References;305
1.6.11;The 3D structure of a dipole in a shallow two-layer fluid;306
1.6.11.1;Introduction;306
1.6.11.2;Experimental and numerical results;307
1.6.11.3;Conclusions;309
1.6.11.4;Acknowledgments;309
1.6.11.5;References;309
1.6.12;The 3D character of decaying turbulence in a shallow fluid layer;310
1.6.12.1;1 Introduction;310
1.6.12.2;2 Laboratory experiments;310
1.6.12.3;3 Numerical comparison between 3D and 2D flows;312
1.6.12.4;4 Conclusion;313
1.6.12.5;References;313
1.6.13;Vortex dynamics in a Karman street behind a heated cylinder: defects and potentialities of acoustic diagnostics;314
1.6.13.1;References;317
1.6.14;Asymmetric vortex shedding in the turbulent wake of a flat plate in a ratating fluid;318
1.6.14.1;1 Introduction;318
1.6.14.2;2 Computational approach and flow characteristics;319
1.6.14.3;3 Results and discussion;320
1.6.14.4;4 Conclusions;320
1.6.14.5;References;321
1.6.15;Stability of steady vortices and new equilibrium flows from “Imperfect-Velocity-Impulse” diagrams;322
1.6.15.1;References;325
1.6.16;The Effect of Freestream Turbulence on Far Axisymmetric Wakes;326
1.6.16.1;References;329
1.6.17;Application of the deterministic turbulence method to study of LEBU-device mechanism;330
1.6.17.1;Introduction.;330
1.6.17.2;Definitions.;330
1.6.17.3;Assumptions.;330
1.6.17.4;Deterministic Turbulence.;330
1.6.17.5;Present Approach.;331
1.6.17.6;LEBU-Devices.;331
1.6.17.7;LEBU Mechanism.;332
1.6.17.8;References;333
1.6.18;The role of the intense vorticity structures in the turbulent structure of the jet edge;334
1.6.18.1;1 Introduction;334
1.6.18.2;2 Direct numerical simulation of a turbulent plane jet;334
1.6.18.3;3 Results and discussion;334
1.6.18.4;References;336
1.6.19;Large Scale Dynamics of a Jet in a Counter Flow;337
1.6.19.1;References;339
1.6.20;Dynamics of vortex filaments in turbulentflows and their impact on particle dispersion;341
1.6.20.1;References;344
1.6.21;The effect of coherent structureson the secondary flow in a square duct;345
1.6.21.1;1 Introduction;345
1.6.21.2;2 Numerical methods;345
1.6.21.3;3 Results;346
1.6.21.4;References;347
1.7;Part V Multiphase and non-Newtonian flows;349
1.7.1;How to Discriminate Between Light and Heavy Particles in Turbulence;350
1.7.1.1;References;353
1.7.2;Anisotropic clustering and particles velocity statistics in shear turbulence;354
1.7.2.1;References;357
1.7.3;Direct Numerical Simulation of inertialparticle accelerations in near-wall turbulence: effect of gravity;358
1.7.3.1;Introduction;358
1.7.3.2;Numerical Methodology;359
1.7.3.3;Results and Discussion;359
1.7.3.4;Conclusions;361
1.7.4;Simulating Fibre Suspensions: Lagrangian versus Statistical Approach;362
1.7.4.1;INTRODUCTION;362
1.7.4.2;RESULTS;363
1.7.4.3;References;365
1.7.5;Inertial particles in a turbulent pipe flow:spatial evolution;366
1.7.5.1;1 Results & discussion;366
1.7.5.2;References;369
1.7.6;Heat transfer mechanisms in bubbly Rayleigh-B´enard convection;370
1.7.6.1;References;372
1.7.7;Scaling of polymer drag reduction withpolymer and flow parameters in turbulent channel flow;373
1.7.7.1;1 Introduction;373
1.7.7.2;2 Results and Discussion;374
1.7.7.3;References;376
1.7.8;DNS study on “diameter effect” of drag reduction in viscoelastic-fluid flow;377
1.7.8.1;1 Introduction;377
1.7.8.2;2 Numerical conditions;377
1.7.8.3;3 Results and discussion;378
1.7.8.4;4 Conclusion;380
1.7.8.5;References;380
1.7.9;Modifications of the turbulent structure in a bubbly boundary layer;381
1.7.9.1;References;384
1.7.10;Budgets of polymer free energy inhomogeneous turbulence;385
1.7.10.1;1 Mathematical formulation and results;385
1.7.10.2;References;388
1.7.11;Shear-induced self-diffusion in a Couette flow of a dilute suspension;389
1.7.11.1;References;392
1.8;Part VI Atmospheric turbulence;393
1.8.1;Turbulent flow over rough walls;394
1.8.1.1;1 Introduction;394
1.8.1.2;2 Zero plane displacement and von K´arm´an’s constant;395
1.8.1.3;3 The near-wall turbulence;397
1.8.1.4;4 Conclusions;400
1.8.1.5;References;401
1.8.2;Top-down and bottom-up eddy motion in wallbounded turbulence;402
1.8.2.1;1 Use of sweeps and ejections;403
1.8.2.2;2 Eddy identification with a vorticity threshold;404
1.8.2.3;References;405
1.8.3;A study of turbulent Poiseuille-Ekman flow at different rotation rates using DNS;406
1.8.3.1;1 Abstract;406
1.8.3.2;2 Introduction;406
1.8.3.3;3 DNS of turbulent Poiseuille-Ekman flow;407
1.8.3.4;References;409
1.8.4;Experimental study of forced stratifiedturbulence;410
1.8.4.1;References;413
1.8.5;DNS of the turbulent cloud-top mixing layer;414
1.8.5.1;1 Introduction;414
1.8.5.2;2 Results;415
1.8.5.3;References;417
1.8.6;Modeling and Simulation of Momentum and Heat Transfer in the Atmospheric Boundary Layer over Rough Surface: Study with Improved;418
1.8.6.1;1 Introduction;418
1.8.6.2;2 Anisotropic three-parameter turbulence model;418
1.8.6.3;3 Turbulent Prandtl number in a Stably Stratified Boundary Layer over Rough Surface;420
1.8.6.4;References;421
1.8.7;Wind Direction Effects on Urban Like Roughness: an LES Study;422
1.8.7.1;1 Introduction;422
1.8.7.2;2 Numerical Approach;422
1.8.7.3;3 Results;423
1.8.7.3.1;3.1 Mean Flow;423
1.8.7.3.2;3.2 Drag and lift forces;424
1.8.7.4;4 Conclusions;425
1.8.7.5;References;425
1.9;Part VII Geophysical and astrophysical turbulence;426
1.9.1;Anisotropy in turbulent rotating convection;427
1.9.1.1;Introduction;427
1.9.1.2;Anisotropy quantified;427
1.9.1.3;Experimental and numerical methods;428
1.9.1.4;Results;429
1.9.1.5;Discussion and conclusion;430
1.9.1.6;References;430
1.9.2;Nonlocal interactions and condensation inforced rotating turbulence;431
1.9.2.1;1 Introduction;431
1.9.2.2;2 Method and results;432
1.9.2.3;3 Conclusion;434
1.9.2.4;References;434
1.9.3;Structural Features of Rotating ShearedTurbulence;435
1.9.3.1;References;438
1.9.4;Structure functions and energy transfers in adecaying rotating turbulence experiment;439
1.9.4.1;References;442
1.9.5;Table-top rotating turbulence: an experimentalinsight through particle tracking;443
1.9.5.1;Introduction;443
1.9.5.2;Exploratory experiments in rotating turbulence;444
1.9.5.3;Ongoing experiments;445
1.9.5.4;References;446
1.9.6;On the structure of rapidly-rotating, decayingturbulence;447
1.9.6.1;Introduction;447
1.9.6.2;How columnar eddies form;448
1.9.6.3;The experimental evidence at Ro ~ 1;448
1.9.6.4;Why linear behaviour at Ro ~1?;449
1.9.6.5;The Decay of Energy;450
1.9.6.6;References;450
1.9.7;Large-eddy simulations of gravity current flows past submerged cylinders;451
1.9.7.1;References;452
1.9.8;Large scale quasi-2D structures and the problem of nonlinear bottom friction;455
1.9.8.1;References;458
1.9.9;Double-period oscillation of passive scalar flux in stratified turbulence;459
1.9.9.1;References;459
1.9.10;Energy spectra of stably stratified turbulence;461
1.9.10.1;References;464
1.9.11;The wind-driven turbulent oscillating channel flow subjected to a stable stratification;465
1.9.11.1;Introduction;465
1.9.11.2;Turbulent oscillating channel flow;465
1.9.11.3;Stably stratified turbulent oscillating channel flow;467
1.9.11.4;Conclusion;468
1.9.11.5;References;468
1.9.12;Numerical studies of turbulence in breaking internal waves;469
1.9.12.1;References;470
1.9.13;Vortex self-similarity and the evolution of unforced inviscid two-dimensional turbulence;473
1.9.13.1;References;476
1.9.14;Large Eddy Simulation of compressible magnetohydrodynamic turbulence in the local interstellar medium;477
1.9.14.1;References;480
1.10;Part VIII Transport and mixing;481
1.10.1;Experimental Studies of Turbulent Rayleigh-Bénard Convection;482
1.10.1.1;References;488
1.10.2;Various flow amplitudes in 2D non-Oberbeck-Boussinesq Rayleigh-Bénard convection in water;490
1.10.2.1;References;493
1.10.3;A comparison of turbulent thermal convection between conditions of constant temperature and constant heat flux boundaries;494
1.10.4;Diffusion of heavy particles in turbulent flows;495
1.10.4.1;References;498
1.10.5;Quantification of heavy particle segregation in turbulent flows: a Lagrangian approach;499
1.10.5.1;References;502
1.10.6;The dispersion of lines written in a turbulent jet flow;503
1.10.6.1;References;505
1.10.7;PDF modeling of vapour micromixing in turbulent evaporating sprays;506
1.10.7.1;References;507
1.10.8;Forces on light particles in stratified turbulence;509
1.10.8.1;Introduction;509
1.10.8.2;Forces on light inertial particles;509
1.10.8.3;Particle dispersion: the role of the Basset force;511
1.10.8.4;Conclusions;512
1.10.8.5;References;512
1.10.9;Renormalized transport of inertial particles;513
1.10.9.1;References;516
1.10.10;Turbulence modification in the vicinity of a solid particle;517
1.10.10.1;References;520
1.10.11;Particle Transport in Turbulent Wakes Behind Spherical Caps;521
1.10.11.1;1 Introduction;521
1.10.11.2;2 Methods;521
1.10.11.3;3 Results;522
1.10.11.4;4 Discussion and Conclusion;524
1.10.11.5;References;524
1.10.12;Turbulent heat transfer and large-scale flow in convection cells with aspect ratio G > 1;525
1.10.12.1;1 Introduction;525
1.10.12.2;2 Dependence of heat transfer on aspect ratio;526
1.10.12.3;3 Large-scale circulation (LSC);526
1.10.12.3.1;3.1 Proper Orthogonal Decomposition (POD);527
1.10.12.4;References;528
1.10.13;Shot noise of thermal plumes : Evidence of a boundary layer instability consistent with the onset of Kraichnan’s Regime of convection;529
1.10.13.1;1 Introduction and Motivation;529
1.10.13.2;2 Experimental set-up;529
1.10.13.3;3 Results : a new signatures of the transition to the Ultimate Regime;530
1.10.13.4;4 Interpretation and Conclusion : a boundary layer instability;530
1.10.13.5;References;532
1.10.14;Scalar mixing in turbulent confined flow;533
1.10.14.1;References;536
1.10.15;Prandtl-, Rayleigh-, and Rossby-number dependence of heat transport in turbulent rotating Rayleigh-Bénard convection;537
1.10.15.1;References;540
1.10.16;Oscillations of Large-Scale Structures in turbulent Mixed Convection in a rectangular enclosure;541
1.10.16.1;1 Introduction;541
1.10.16.2;2 Experimental set up;542
1.10.16.3;3 Results;542
1.10.16.4;References;544
1.10.17;Interaction between slope flows and an urban heat island;545
1.10.17.1;1 Introduction;545
1.10.17.2;2 Experimental setup;545
1.10.17.3;3 Results;546
1.10.17.4;References;548
1.10.18;Origin of the small-scale anisotropy of the passive scalar fluctuations;549
1.10.18.1;References;552
1.10.19;Mixing asymmetry in variable densityturbulence;553
1.10.19.1;References;556
1.10.20;Turbulent transport close to a wall;557
1.10.20.1;References;560
1.10.21;Persistence of inhomogeneity of the turbulence generated by the static grid structures;561
1.10.21.1;1 Introduction;561
1.10.21.2;2 Results and Discussion;562
1.10.21.3;References;564
1.10.22;On the energy decay of grid generated turbulence;565
1.10.22.1;References;568
1.10.23;Turbulent Entrainment in Jets: The role of Kinetic Energy;569
1.10.23.1;1 Introduction;569
1.10.23.2;2 DNS of a turbulent plane jet;569
1.10.23.3;3 Results and Discussion;569
1.10.23.4;References;570
1.10.24;Fast and slow changes of the length of gradient trajectories in homogeneous shear turbulence;573
1.10.24.1;References;577
1.11;Part IX W all bounded flows;578
1.11.1;Coherent streaky structures and optimal perturbations of turbulent boundary layers;579
1.11.1.1;References;582
1.11.2;Time-mean description of turbulent bluff-body separation in the high-Reynolds-number limit;583
1.11.2.1;1 Motivation;583
1.11.2.2;2 Asymptotic picture of the flow near separation;584
1.11.2.3;3 Current research and further outlook;586
1.11.2.4;References;586
1.11.3;Isotropic Free-stream Turbulence Promotes Anisotropy in a Turbulent Boundary Layer;587
1.11.3.1;References;590
1.11.4;Travelling waves in a straight square duct;591
1.11.4.1;1 Introduction;591
1.11.4.2;2 Numerical method;591
1.11.4.3;3 Results;592
1.11.4.4;References;594
1.11.5;Thermal boundary layers in turbulent Rayleigh-B´enard convection;595
1.11.5.1;1 Introduction;595
1.11.5.2;2 Experimental Results;597
1.11.5.3;References;598
1.11.6;DNS of turbulent transport of scalar concentration in various thermally stratified boundary layers;599
1.11.6.1;References;601
1.11.7;Wall turbulence without walls;603
1.11.7.1;1 Introduction;603
1.11.7.2;2 Numerical experiment;604
1.11.7.3;3 Results;604
1.11.7.4;4 Conclusions;605
1.11.7.5;References;606
1.11.8;Turbulent flow and heat transfer in eccentric annulus;607
1.11.8.1;1 Introduction;607
1.11.8.2;2 Research approach and methods;607
1.11.8.3;3 Results and discussions;607
1.11.8.3.1;3.1 Law of the wall;608
1.11.8.3.2;3.2 Reynolds stress tensor;608
1.11.8.3.3;3.3 Secondary motion;608
1.11.8.3.4;3.4 Intensity of the temperature fluctuations;609
1.11.8.4;4 Conclusions and further Work;610
1.11.8.5;References;610
1.11.9;On imperfect hot-wire resolution issues and their effect on mean quantities;611
1.11.9.1;1 Introduction;611
1.11.9.2;2 Motivation and Strategy;612
1.11.9.3;3 Results and Discussion;613
1.11.9.4;4 Final Remarks;614
1.11.9.5;References;614
1.11.10;The diagnostic plot - a new way to appraise turbulent boundary-layer data;615
1.11.10.1;1 Introduction;615
1.11.10.2;2 The diagnostic plot;616
1.11.10.3;3 Final remarks;618
1.11.10.4;References;618
1.11.11;DHMPIV and Tomo-PIV measurements of three-dimensional structures in a turbulent boundary layer;619
1.11.11.1;1 Experimental setup;619
1.11.11.2;2 Results;620
1.11.11.3;3 Conclusion;622
1.11.12;LDA measurements of Reynolds stresses in aswirling turbulent pipe flow;623
1.11.12.1;1 Background;623
1.11.12.2;2 Experimental Facility;624
1.11.12.3;3 Results and Conclusions;624
1.11.12.4;References;625
1.11.13;Time-resolved stereoscopic PIV of the log-layer in fully developed turbulent pipe flow;627
1.11.13.1;1 Introduction;627
1.11.13.2;2 Experimental Setup;627
1.11.13.3;3 Preliminary Discussion of Results;628
1.11.13.4;4 Outlook;630
1.11.13.5;References;630
1.11.14;Massive separation in rotating turbulent flows;631
1.11.14.1;1 Motivation;631
1.11.14.2;2 Results;632
1.11.14.3;References;634
1.11.15;Scaling of torque in turbulent Taylor-Couetteflow with background rotation;635
1.11.15.1;References;638
1.11.16;Velocity gradient statistics in a turbulentchannel flow;639
1.11.16.1;References;642
1.11.17;Channel flow LES with stochastic modeling of the sub-grid acceleration;643
1.11.17.1;References;646
1.11.18;DNS of three-dimensional separation in turbulent diffuser flows;647
1.11.18.1;References;650
1.11.19;Optimal amplification of large scale streaks in the turbulent Couette flow;651
1.11.19.1;1. Introduction;651
1.11.19.2;2. Results and discussion;652
1.11.19.3;References;653
1.11.20;Symmetry of Coherent Vortices in Plane Couette Flow;655
1.11.20.1;References;658
1.11.21;Universal character of perturbation growth in near-wall turbulence;659
1.11.21.1;1 Introduction;659
1.11.21.2;2 Formulation and numerical method;659
1.11.21.3;3 Results;660
1.11.21.3.1;3.1 Temporal evolution of perturbations;662
1.11.21.4;References;662
1.11.22;Experimental assessment of turbulent drag reduction by wall traveling waves;663
1.11.22.1;References;666
1.11.23;Effects of very-large roughness in turbulent channel flow;667
1.11.23.1;1 Introduction;667
1.11.23.2;2 Experimental details;668
1.11.23.3;3 Results and discussion;668
1.11.23.4;4 Conclusions;670
1.11.23.5;References;670
1.11.24;Roughness effects in a rotating turbulent channel;671
1.11.24.1;References;674
1.11.25;Mean Flow and Turbulence over Rough Surfaces;675
1.11.25.1;References;678
1.12;Part X Intermittency and scaling;679
1.12.1;DNS of vibrating grid turbulence;680
1.12.1.1;References;680
1.12.2;Step onset from an initial uniform distribution of turbulent kinetic energy.;681
1.12.2.1;1 Introduction;681
1.12.2.2;2 Results and discussion;681
1.12.2.3;References;683
1.12.3;Fractal-generated turbulent scaling laws from a new scaling group of the multi-point correlation equation;685
1.12.3.1;1 Multi-point equation of homogeneous turbulence;685
1.12.3.2;2 Invariant solutions and turbulent decay scaling laws;686
1.12.3.3;References;688
1.12.4;Casimir Cascades in Two-Dimensional Turbulence;689
1.12.4.1;1 Two-Dimensional Turbulence;689
1.12.4.2;References;692
1.12.5;The development of truncated inviscid turbulence and the FPU-problem;693
1.12.5.1;References;696
1.12.6;The renormalized eddy-fragmentation equation and its exact solutions;697
1.12.6.1;References;700
1.12.7;Determination of the statistics of the velocity gradient tensor as a function of scale : solution of the tetrad model;701
1.12.7.1;References;704
1.12.8;TSF Experiment for comparision of high Reynold’s number turbulence in He I and He II : first results.;705
1.12.8.1;1 Experimental facility and sensors;705
1.12.8.2;2 First results;707
1.12.8.3;3 Conclusion;708
1.12.8.4;References;708
1.12.9;Extraction of the non-equilibrium energy spectrum in high Reynolds number turbulence;709
1.12.9.1;References;712
1.12.10;Universality of Kolmogorov law in spectrally condensed turbulence in thin layers;713
1.12.10.1;References;714
1.12.11;Multi-scale correlations in regular and fractal-generated turbulence;715
1.12.11.1;Introduction;715
1.12.11.2;Results for fractal-generated turbulence;716
1.12.11.3;References;718
1.12.12;On an alternative explanation of anomalous scaling and how inertial is the inertial range;719
1.12.12.1;References;722
1.12.13;Phenomenological relation between the Kolmogorov constant and the skewness in turbulence;723
1.12.13.1;References;724
1.12.14;Kolmogorov scaling and intermittency in Rayleigh-Taylor turbulence;725
1.12.14.1;References;728
1.12.15;Observation of weak turbulence spectra of capillary waves;729
1.12.15.1;References;732
1.12.16;A new numerical methodology to follow the time-decay of turbulence;733
1.12.16.1;References;736
1.12.17;Velocity kinematic relations in decaying turbulent flow past a grid;737
1.12.17.1;References;740
1.12.18;Lagrangian intermittency and time-correlations in two-dimensional turbulence;741
1.12.18.1;References;744
1.13;Part XI Large eddy simulation;745
1.13.1;Implicit Large-Eddy Simulation: Theory and Application;746
1.13.1.1;1 General Concept of ILES;746
1.13.1.2;2 The Modified Differential Equation;747
1.13.1.3;3 Review of ILES approaches;749
1.13.1.3.1;3.1 The Volume Balance Procedure of Schumamm;749
1.13.1.3.2;3.2 The Kawamura-Kuwahara scheme;749
1.13.1.3.3;3.3 The Piecewise-Parabolic Method;749
1.13.1.3.4;3.4 The Flux-Corrected-Transport Method;750
1.13.1.3.5;3.5 The MPDATA Method;750
1.13.1.3.6;3.6 The Optimum Finite-Volume Scheme;750
1.13.1.3.7;3.7 Implicit LES by Adaptive Local Deconvolution;751
1.13.1.4;References;751
1.13.2;A challenging new problem for LES: the flow near the turbulent/nonturbulent interface;754
1.13.2.1;1 Introduction;754
1.13.2.2;2 Direct numerical Simulation of turbulent plane jets;754
1.13.2.3;3 Results and discussion;756
1.13.2.4;References;757
1.13.3;Towards practical large-eddy simulations of complex turbulent flows;758
1.13.3.1;References;761
1.13.4;Coherent Vortex Simulation: application to 3D homogeneous isotropic turbulence;762
1.13.4.1;1 Introduction;762
1.13.4.2;2 Methodology;763
1.13.4.3;3 Numerical Results;763
1.13.4.4;4 Conclusions and Discussions;764
1.13.4.5;References;764
1.13.5;LES of a Non-Premixed Flame with anAssumed Tophat FDF;766
1.13.5.1;References;769
1.13.6;Closure models for inhomogeneous turbulence;770
1.13.6.1;References;773
1.13.7;Statistical Mechanics of Fluid Turbulence based on the Cross-Independence Closure Hypothesis;774
1.13.7.1;1.1 Introduction;774
1.13.7.2;1.2 Cross-independence Closure Hypothesis;774
1.13.7.3;1.3 Inhomogeneous Turbulence;775
1.13.7.4;1.4 Turbulent Wakes;776
1.13.7.5;1.5 References;777
1.13.8;Large-Eddy Simulation of a Two-Phase Plane Mixing-Layer;778
1.13.8.1;1 Introduction;778
1.13.8.2;2 Flow and Boundary Conditions;778
1.13.8.3;3 Results and Discussion;779
1.13.8.3.1;3.1 Gas-phase;779
1.13.8.3.2;3.2 Liquid-phase;779
1.13.8.4;4 Conclusions;779
1.13.8.5;5 Acknowledgement;780
1.13.8.6;References;780
1.13.9;Subgrid particle resolution for the turbulenttransport of a passive scalar;782
1.13.9.1;1 Introduction;782
1.13.9.2;2 The numerical method;782
1.13.9.3;3 Results;783
1.13.9.4;4 Conclusion;785
1.13.9.5;References;785
1.13.10;An adaptive local deconvolution method forgeneral curvilinear coordinate systems;786
1.13.10.1;References;788
1.13.11;On under-resolved simulation of atmosphericconvection;790
1.13.11.1;References;792
1.13.12;The Multispectral Method: Progress and Prospects;793
1.13.12.1;1 Introduction;793
1.13.12.2;2 The models in question;793
1.13.12.3;3 Spectral Reduction;794
1.13.12.4;4 Interpolation;795
1.13.12.5;5 The Multispectral Method;796
1.13.12.6;References;796
1.13.13;Discretization errors and subgrid scale implementations in Large Eddy Simulations;797
1.13.13.1;References;800
1.14;Part XII Magnetohydrodynamical turbulence;801
1.14.1;Reversals of the magnetic field generated by a turbulent flow;802
1.14.1.1;1 A dynamo generated by a von Karman swirling flow;802
1.14.1.2;2 Geometry of the mean magnetic field: equatorial versus axial dipoles;804
1.14.1.3;3 Broken symmetries and dynamics of the large scale magnetic field;805
1.14.1.4;4 A mechanism for oscillations and reversals;806
1.14.1.5;5 A simple model for Earth’s magnetic field reversals;808
1.14.1.6;References;809
1.14.2;Direct measurement of turbulent magnetic diffusivity in liquid metal flow;810
1.14.2.1;References;813
1.14.3;Shell models of MHD turbulence;814
1.14.3.1;References;817
1.14.4;Turbulence induced by magnetic fields;818
1.14.4.1;References;821
1.14.5;Spin-up in MHD turbulence;822
1.14.5.1;Acknowledgments;825
1.14.5.2;References;825
1.14.6;Influence of helicities on statistical properties of MHD turbulence;826
1.14.6.1;References;828
1.14.7;Transient growth in MHD duct flow;830
1.14.7.1;References;833
1.14.8;Optical visualisation of the flow around a cylinder in electrolyte under strong axial magnetic field.;834
1.14.8.1;Introduction;834
1.14.8.2;Experimental device;836
1.14.8.3;Results;836
1.14.8.4;Acknowledgments;837
1.14.8.5;References;837
1.14.9;Synthetic turbulence model and DNS formagnetohydrodynamics with rotation;838
1.14.9.1;1 Introduction;838
1.14.9.2;2 Numerical method;838
1.14.9.3;3 Results;839
1.14.9.4;4 Perspectives;841
1.14.9.5;References;841
1.14.10;Spectral analysis of energy transfers in anisotropic MHD turbulence;842
1.14.10.1;References;845
1.15;Part XIII Acoustics of turbulence flows;846
1.15.1;Boundary layer influence on cavity noisegeneration;847
1.15.1.1;Introduction;847
1.15.1.2;Experimental setup;848
1.15.1.3;Results;848
1.15.1.4;References;850
1.15.2;Instability waves as a source of subsonic jetnoise;851
1.15.2.1;References;853
1.15.3;Experimental study of sound production for constricted channels: application to simplified vocal tract geometries;855
1.15.3.1;1 Introduction;855
1.15.3.2;2 From “in-vivo” observations to “in-vitro” experiments;855
1.15.3.3;3 Results;857
1.15.3.4;Conclusion and perspectives;858
1.15.3.5;References;858
1.15.4;Turbulent Pressure Statistics in an Underwater Boundary-Layer Experiment;859
1.15.4.1;Introduction;859
1.15.4.2;Wavenumber-frequency decomposition;859
1.15.4.3;Flow noise;860
1.15.4.4;Summary;862
1.15.4.5;References;862
1.15.5;Spectral reconstruction of sound radiated byan organ pipe;863
1.15.5.1;References;866
1.15.6;Aerodynamic sound generation by turbulence in shear flows;867
1.15.6.1;References;870
1.16;Part XIV Reacting and compressible turbulence;871
1.16.1;On implicit turbulence modeling for LES of compressible flows;872
1.16.1.1;References;873
1.16.2;Injection of a plane reacting jet into a supersonic turbulent channel flow;875
1.16.2.1;1 Introduction;875
1.16.2.2;2 Numerical details;875
1.16.2.3;3 Results;876
1.16.2.4;References;877
1.16.3;Turbulent premixed flame fronts: fractalscaling and implications for LES modeling;879
1.16.3.1;1 Introduction;879
1.16.3.2;2 Methodology: experiments and numerics;879
1.16.3.3;3 Results and analysis;880
1.16.3.4;References;882
1.16.4;Large eddy simulation of a lean premixed swirl flame in complex geometry - comparison of two turbulent combustion models;883
1.16.4.1;References;885
1.17;Part XV Posters;887
1.17.1;KS inertial range and validity of Richardson’slaw;888
1.17.1.1;1 Kinematic Simulation;888
1.17.1.2;2 Kinematic Simulation and t³ law;888
1.17.1.3;3 Present study;889
1.17.1.4;References;889
1.17.2;Lagrangian Vortex Methods in Turbulent Channel Flows;890
1.17.2.1;References;890
1.17.3;Unstable and turbulent flows simulated by means of the Boltzmann kinetic equation;891
1.17.3.1;References;891
1.17.4;Natural Transition in Plane Poiseuille Flow;892
1.17.4.1;References;893
1.17.5;Stabilization of the turbulent flows in anisotropic viscoelastic tubes;894
1.17.5.1;References;894
1.17.6;Simulation of induced transition in hypersonic regime: Validation of foot print of the vortical structures;895
1.17.6.1;References;896
1.17.7;Active grid generated turbulence;897
1.17.8;Velocity characterisation of axisymmetric jets from human-sized channels;898
1.17.9;The role of nonlocality in unsteady turbulence;899
1.17.9.1;References;899
1.17.10;Coherent enstrophy production and dissipation in 2D turbulence with and without walls;900
1.17.10.1;References;900
1.17.11;Space-scale analysis of enstrophy transfers in two-dimensional turbulence;901
1.17.12;Hydrodynamic stability of a stratified suspension flow in a plane channel;902
1.17.12.1;References;902
1.17.13;Localization of compact invariant sets of theLorenz’ 1984 model;903
1.17.13.1;References;903
1.17.14;Large-scale energy dissipation and equatorialsuperrotation in shallow water turbulence;904
1.17.15;The effects of rain on wind-driven turbulent flow;905
1.17.15.1;References;905
1.17.16;New results on grid-generated turbulence;906
1.17.17;Gas-liquid interaction under vibration field effect;907
1.17.18;An Invariant Nonlinear Eddy Viscosity Model based on a 4D Modelling Approach;908
1.17.18.1;References;908
1.17.19;Projection of the turbulence closure problem on the invariant triangle as the basis for improved predictions of complex flows;909
1.17.19.1;References;909
1.17.20;A computational study of the hydrodynamicforces on a rough wall;910
1.17.20.1;References;910
1.17.21;Turbulent flow structure investigation within target fluidic flowmeter;911
1.17.22;The Wake of a Single 2D Roughness Element Immersed in a Turbulent Boundary Layer;912
1.17.22.1;References;912
1.17.23;High spanwise wall-shear stress events inturbulent duct flow;913
1.17.23.1;References;914
1.17.24;A POD-based reconstruction method for the flow in the near-wall region;915
1.17.25;Near-wall velocity and wall shear stress correlations in a separating boundary layer;916
1.17.26;Lifetimes of flow topology in a turbulent boundary layer;917
1.17.27;RDT or low wavenumber modes’ dynamics?;918
1.17.28;Intermittency in high resolution direct numerical simulation of turbulence in a periodic box: a wavelet viewpoint;919
1.17.28.1;References;919
1.17.29;Detached Eddy Simulation of Turbulence Flows in a Pipe with Fractal Shape Orifices;920
1.17.29.1;References;920
1.17.30;Recovery of subgrid-scale turbulence kinetic energy in LES of channel flow;922
1.17.30.1;References;922
1.17.31;Beyond Reynolds stress analysis of quasilaminar flows;923
1.17.32;Anisotropic Organised Eddy Simulation for statistical and hybrid modelling of turbulent flows around bodies;924
1.17.32.1;References;925
1.17.33;Experimental vortex generation and instabilities at flow around a magnetic obstacle;926
1.17.33.1;References;926
1.17.34;A dynamic multiscale subgrid model for MHD turbulence based on Kolmogorov’s equation;927
1.17.34.1;References;927
1.17.35;Low-Prandtl number MHD cooling in a vertical cylindrical container;928
1.17.35.1;References;928
1.17.36;Anomalous scaling of passively advected magnetic field in the kinematic MHD Kazantsev-Kraichnan model;929
1.17.37;A new compressible turbulence model for free and wall-bounded shear layers;930
1.17.38;Modelling of turbulent flow in a gas burner.;931
1.17.38.1;References;931
1.18;Contributors;932