Schlatter Seventh IUTAM Symposium on Laminar-Turbulent Transition

Proceedings of the Seventh IUTAM Symposium on Laminar-Turbulent Transition, Stockholm, Sweden, 2009
1. Auflage 2010
ISBN: 978-90-481-3723-7
Verlag: Springer-Verlag
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 608 Seiten

The origins of turbulent ?ow and the transition from laminar to turbulent ?ow are the most important unsolved problems of ?uid mechanics and aerodynamics. - sides being a fundamental question of ?uid mechanics, there are numerous app- cations relying on information regarding transition location and the details of the subsequent turbulent ?ow. For example, the control of transition to turbulence is - pecially important in (1) skin-friction reduction of energy ef?cient aircraft, (2) the performance of heat exchangers and diffusers, (3) propulsion requirements for - personic aircraft, and (4) separation control. While considerable progress has been made in the science of laminar to turbulent transition over the last 30 years, the c- tinuing increase in computer power as well as new theoretical developments are now revolutionizing the area. It is now starting to be possible to move from simple 1D eigenvalue problems in canonical ?ows to global modes in complex ?ows, all - companied by accurate large-scale direct numerical simulations (DNS). Here, novel experimental techniques such as modern particle image velocimetry (PIV) also have an important role. Theoretically the in?uence of non-normality on the stability and transition is gaining importance, in particular for complex ?ows. At the same time the enigma of transition in the oldest ?ow investigated, Reynolds pipe ?ow tran- tion experiment, is regaining attention. Ideas from dynamical systems together with DNS and experiments are here giving us new insights.

Autoren/Hrsg.

Schlatter, Philipp

Inhaltsverzeichnis

1;186838_1_En_BookFrontmatter_OnlinePDF.pdf;1
1.1;Seventh IUTAMSymposium on Laminar-Turbulent Transition;3
1.1.1;Contents;5
1.1.2;Preface;14
2;186838_1_En_1_Chapter_OnlinePDF.pdf;25
2.1;A Gradient-based Optimization Method for Natural Laminar Flow Design;25
2.1.1;1 Introduction;25
2.1.2;2 Governing equations;26
2.1.3;3 Optimization problem;27
2.1.4;4 Results;28
2.1.5;5 Conclusions;31
2.1.6;References;32
3;186838_1_En_2_Chapter_OnlinePDF.pdf;33
3.1;A Thermodynamic Lower Bound on Transition-Triggering Disturbances;33
3.1.1;1 Oscillators versus Amplifiers;33
3.1.1.1;1.1 Receptivity;33
3.1.1.2;1.2 Can transition be indefinitely delayed?;34
3.1.2;2 Fluctuation theory;34
3.1.2.1;2.1 One-dimensional: Langevin;34
3.1.2.1.1;2.1.1 Fluctuation-dissipation relationship in the frequency domain;35
3.1.2.1.2;2.1.2 Fluctuation-dissipation relationship in the time domain;36
3.1.2.2;2.2 Multi-dimensional fluctuation theory: Onsager;36
3.1.2.3;2.3 Infinite-dimensional fluctuation theory: Landau-Lifschitz;37
3.1.2.3.1;2.3.1 Fluctuations in macroscopic motion;38
3.1.3;3 Boundary-layer receptivity to thermodynamic fluctuations;38
3.1.3.1;3.1 The spatial stability problem;39
3.1.4;4 Conclusions;40
3.1.5;References;40
4;186838_1_En_3_Chapter_OnlinePDF.pdf;41
4.1;Hypersonic boundary layer transition and control;41
4.1.1;1 Experiments on nonlinear instability of hypersonic boundary layers at moderate Mach numbers;41
4.1.1.1;1.1 Experimental equipment;42
4.1.1.2;1.2 Statistical and bispectral analysis;42
4.1.1.3;1.3 Experimental results;42
4.1.2;2 Active control of hypersonic shock layer instability: direct numerical simulation and experiments;45
4.1.2.1;2.1 Experimental equipment and diagnostic methods;45
4.1.2.2;2.2 Numerical simulation;46
4.1.2.3;2.3 Results;46
4.1.3;References;48
5;186838_1_En_4_Chapter_OnlinePDF.pdf;49
5.1;Instabilities of Miscible Interfaces;49
5.1.1;1 Miscible core-annular flows;49
5.1.2;2 Miscible Hele-Shaw displacements;50
5.1.3;3 Miscible porous media displacements;53
5.1.4;References;55
6;186838_1_En_5_Chapter_OnlinePDF.pdf;57
6.1;Large-eddy simulations of relaminarization due to freestream acceleration;57
6.1.1;1 Introduction;57
6.1.2;2 Problem formulation;58
6.1.3;3 Results and discussion;59
6.1.4;4 Conclusions;63
6.1.5;References;64
7;186838_1_En_6_Chapter_OnlinePDF.pdf;65
7.1;Reduced-order models for flow control: balanced models and Koopman modes;65
7.1.1;1 Introduction;65
7.1.2;2 Model reduction techniques;66
7.1.2.1;2.1 Proper Orthogonal Decomposition and its limitations;66
7.1.2.2;2.2 Balanced models;67
7.1.3;3 Spectral analysis of nonlinear flows;67
7.1.3.1;3.1 Koopman operator and Koopman modes;68
7.1.3.2;3.2 Properties of Koopman modes and eigenvalues;69
7.1.3.3;3.3 Computing Koopman modes from snapshots;69
7.1.3.4;3.4 Example: jet in crossflow;70
7.1.3.5;3.5 Comparison with linear global modes and POD modes;71
7.1.3.6;References;72
8;186838_1_En_7_Chapter_OnlinePDF.pdf;73
8.1;The description of fluid behavior by coherent structures;73
8.1.1;1 Introduction and motivation;73
8.1.2;2 Global stability analysis of compressible flow about a swept parabolic body;74
8.1.3;3 Microlocal stability analysis of swept attachment-line boundary layer flow;75
8.1.4;4 Dynamic mode analysis of the wake behind a flexible membrane;77
8.1.5;5 Summary and conclusions;79
8.1.6;References;80
9;186838_1_En_8_Chapter_OnlinePDF.pdf;81
9.1;Instability of uniform turbulent plane Couette flow: spectra, probability distribution functions and K m closure model;81
9.1.1;1 Turbulent-laminar bands;81
9.1.2;2 Analysis of Fourier spectra;83
9.1.3;3 Stability analysis of K m Model;85
9.1.4;References;87
10;186838_1_En_9_Chapter_OnlinePDF.pdf;90
10.1;Sensitivity to base-flow variation of a streamwise corner flow;90
10.1.1;1 Introduction;90
10.1.2;2 Temporal asymptotic linear stability.;91
10.1.3;3 Sensitivity analysis;93
10.1.3.1;3.1 Sensitivity functions;93
10.1.3.2;3.2 Optimal deviation and physical mechanism;93
10.1.4;4 Conclusion;95
10.1.5;References;95
11;186838_1_En_10_Chapter_OnlinePDF.pdf;96
11.1;Transition Control Testing in the Supersonic S2MAWind Tunnel (SUPERTRAC project);96
11.1.1;1 Introduction;96
11.1.2;2 Wing Definition;97
11.1.3;3 Control by Micron-Sized Roughness elements (MSR);97
11.1.4;4 Control of the leading edge contamination (ACD);99
11.1.5;5 Conclusion;101
11.1.6;6 Acknowledgements;101
11.1.7;References;101
12;186838_1_En_11_Chapter_OnlinePDF.pdf;102
12.1;Breakdown of Low-Speed Streaks under High-Intensity Background Turbulence;102
12.1.1;1 Introduction;102
12.1.2;2 Experimental setup and procedure;103
12.1.3;3 Results and discussion;104
12.1.4;4 Conclusions;107
12.1.5;References;107
13;186838_1_En_12_Chapter_OnlinePDF.pdf;108
13.1;Numerical Study on Transition of a Channel Flow with LongitudinalWall-oscillation;108
13.1.1;1 Introduction;108
13.1.2;2 Numerical Analysis;109
13.1.2.1;2.1 Model Flow;109
13.1.2.2;2.2 Results;110
13.1.3;3 Linear Stability Analysis;111
13.1.3.1;3.1 Quaisi steady analysis;111
13.1.3.2;3.2 Results;112
13.1.4;4 Conclusion;113
13.1.5;References;113
14;186838_1_En_13_Chapter_OnlinePDF.pdf;114
14.1;Direct Numerical Simulation of the Mixing Layer past Serrated Nozzle Ends;114
14.1.1;1 Introduction and Numerical Method;114
14.1.2;2 Results;115
14.1.3;3 Conclusions;119
14.1.4;References;119
15;186838_1_En_14_Chapter_OnlinePDF.pdf;120
15.1;Receptivity of a supersonic boundary layer to shock-wave oscillations;120
15.1.1;1 Introduction;120
15.1.2;2 Numerical Method;121
15.1.3;3 Results;121
15.1.4;4 Conclusions;125
15.1.5;References;125
16;186838_1_En_15_Chapter_OnlinePDF.pdf;126
16.1;Roughness receptivity studies in a 3-D boundary layer – Flight tests and computations;126
16.1.1;1 Introduction;126
16.1.2;2 Cp Measurements;127
16.1.3;3 Critical DREs;128
16.1.4;4 Receptivity Measurements;129
16.1.5;5 Receptivity Results;130
16.1.6;References;131
17;186838_1_En_16_Chapter_OnlinePDF.pdf;132
17.1;DNS investigations of steady receptivity mechanisms on a swept cylinder;132
17.1.1;1 Geometry, main assumptions;132
17.1.2;2 Unexpected unsteady fluctuation;133
17.1.3;3 Steady perturbation;134
17.1.3.1;3.1 Considered shapes of the perturbation;135
17.1.3.2;3.2 Steady crossflow mode;135
17.1.3.3;3.3 Influence of the roughness element shape;136
17.1.4;References;137
18;186838_1_En_17_Chapter_OnlinePDF.pdf;138
18.1;Experimental Study of the Incipient Spot Breakdown Controlled by Riblets;138
18.1.1;1 Introduction;138
18.1.2;2 Experimental Setup and Measurement Procedure;139
18.1.3;3 Results and Discussion;140
18.1.4;4 Conclusions;142
18.1.5;References;142
19;186838_1_En_18_Chapter_OnlinePDF.pdf;144
19.1;Control of Stationary Cross-flow Modes Using Patterned Roughness at Mach 3.5;144
19.1.1;1 Experimental Approach;145
19.1.2;2 Results;146
19.1.2.1;2.1 Flow Visualization;146
19.1.2.2;2.2 Mean Velocity Measurements;147
19.1.3;3 Conclusions;148
19.1.4;References;149
20;186838_1_En_19_Chapter_OnlinePDF.pdf;150
20.1;Secondary optimal growth and subcritical transition in the plane Poiseuille flow;150
20.1.1;1 Introduction and background;150
20.1.2;2 Results and discussion;152
20.1.3;References;155
21;186838_1_En_20_Chapter_OnlinePDF.pdf;156
21.1;Disturbance evolution in rotating-disk boundary layers: competition between absolute instability and global stability;156
21.1.1;1 Introduction;156
21.1.2;2 Modelling of numerical simulation results;157
21.1.3;3 Simulation results for cases with mass transfer;158
21.1.4;4 Summary;161
21.1.5;References;161
22;186838_1_En_21_Chapter_OnlinePDF.pdf;162
22.1;Instabilities due a vortex at a density interface: gravitational and centrifugal effects;162
22.1.1;1 Introduction;162
22.1.2;2 Centrifugal effects;163
22.1.3;3 Gravitational effects;165
22.1.4;4 Conclusions and outlook;166
22.1.5;References;167
23;186838_1_En_22_Chapter_OnlinePDF.pdf;168
23.1;Wave Packets of Controlled Velocity Perturbations at Laminar Flow Separation;168
23.1.1;1 Introduction;168
23.1.2;2 Experimental set-up;169
23.1.3;3 Results and discussion;170
23.1.4;References;173
24;186838_1_En_23_Chapter_OnlinePDF.pdf;174
24.1;Linear Stability Analysis for Manipulated Boundary-Layer Flows using Plasma Actuators;174
24.1.1;1 Introduction;174
24.1.2;2 Linear Stability Analysis;175
24.1.3;3 Results;176
24.1.4;4 Discussion;179
24.1.5;References;179
25;186838_1_En_24_Chapter_OnlinePDF.pdf;180
25.1;Stripy patterns in low-Re turbulent plane Couette flow;180
25.1.1;1 Introduction;180
25.1.2;2 Results;181
25.1.2.1;2.1 Numerical method;181
25.1.2.2;2.2 Formation of stripes;182
25.1.3;References;185
26;186838_1_En_25_Chapter_OnlinePDF.pdf;186
26.1;Characterization of the three-dimensiona linstability in a lid-driven cavity by an adjoint based analysis;186
26.1.1;1 Introduction;186
26.1.2;2 Governing equations and solution method;187
26.1.3;3 Results;188
26.1.4;References;191
27;186838_1_En_26_Chapter_OnlinePDF.pdf;192
27.1;Bi-global crossplane stability analysis of high-speed boundary-layer flows with discrete roughness;192
27.1.1;1 Introduction;192
27.1.2;2 Bi-global secondary linear stability theory & numerics;192
27.1.3;3 Primary state;193
27.1.4;4 Results;194
27.1.5;5 Conclusions;197
27.1.6;References;197
28;186838_1_En_27_Chapter_OnlinePDF.pdf;198
28.1;Time-resolved PIV investigations on the laminar-turbulent transition over laminar separation bubbles;198
28.1.1;1 Introduction;198
28.1.2;2 Experimental setup and data evaluation;199
28.1.3;3 Results;199
28.1.4;4 Conclusion;202
28.1.5;References;202
29;186838_1_En_28_Chapter_OnlinePDF.pdf;204
29.1;Control of transient growth induced boundary layer transition using plasma actuators;204
29.1.1;1 Introduction;204
29.1.2;2 Experimental Details;205
29.1.3;3 Results;206
29.1.4;4 Conclusions and Outlook;208
29.1.5;References;209
30;186838_1_En_29_Chapter_OnlinePDF.pdf;210
30.1;Laminar Flow Control by Suction at Mach 2;210
30.1.1;1 Introduction;210
30.1.2;2 Experimental Set-Up;211
30.1.3;3 Experimental Results;211
30.1.4;4 Numerical Analyses;213
30.1.5;5 Conclusions;215
30.1.6;References;215
31;186838_1_En_30_Chapter_OnlinePDF.pdf;216
31.1;Decay of turbulent bursting in enclosed flows;216
31.1.1;1 Introduction;216
31.1.2;2 Methods;217
31.1.3;3 Results;217
31.1.4;4 Conclusion and outlook;220
31.1.5;References;221
32;186838_1_En_31_Chapter_OnlinePDF.pdf;222
32.1;Local and Global Stability of Airfoil Flows at Low Reynolds Number;222
32.1.1;1 Introduction;222
32.1.2;2 Behaviour with incidence;224
32.1.3;3 Influence of compressibility;225
32.1.4;4 Influence of Reynolds Number and Airfoil Geometry;225
32.1.5;5 Conclusion;226
32.1.6;References;227
33;186838_1_En_32_Chapter_OnlinePDF.pdf;228
33.1;Numerical simulation of riblet controlled oblique transition;228
33.1.1;1 Introduction;228
33.1.2;2 Numerical Method;229
33.1.3;3 Flow configuration and computational mesh;230
33.1.4;4 Results;230
33.1.5;References;231
34;186838_1_En_33_Chapter_OnlinePDF.pdf;234
34.1;Transition Movement in theWake of Protruding and Recessed Three-Dimensional Surface Irregularities;234
34.1.1;1 Introduction;234
34.1.2;2 Transition Measurements;235
34.1.3;3 Stability Calculations;236
34.1.4;4 Conclusions;237
34.1.5;References;238
35;186838_1_En_34_Chapter_OnlinePDF.pdf;240
35.1;Plasma Assisted Aerodynamics for Transition Delay;240
35.1.1;1 Introduction;240
35.1.2;2 Theoretical Background;241
35.1.2.1;2.1 Plasma model;241
35.1.3;3 Results;242
35.1.4;4 Conclusions and Future work;244
35.1.5;References;245
36;186838_1_En_35_Chapter_OnlinePDF.pdf;246
36.1;Experimental study on stability of the laminar and turbulent plane jets;246
36.1.1;1 Laminar plane jet with the abrupt mean velocity profile at the nozzle exit;246
36.1.2;2 A laminar and turbulent plane jet with a parabolic mean velocity profile at the nozzle exit;248
36.1.3;3 Plane jet approaching to the microjet;250
36.1.4;4 Conclusions;251
36.1.5;References;251
37;186838_1_En_36_Chapter_OnlinePDF.pdf;252
37.1;Evolution Of Traveling Crossflow Modes Over A Swept Flat Plate;252
37.1.1;1 Introduction;252
37.1.2;2 Experimental Setup;252
37.1.2.1;2.1 Turbulence generation;254
37.1.3;3 Results;254
37.1.3.1;3.1 Velocity and Disturbance Profiles;254
37.1.3.2;3.2 Spanwise Correlations;255
37.1.3.3;3.3 Disturbance Growth;256
37.1.4;4 Conclusions and Outlook;257
37.1.5;References;257
38;186838_1_En_37_Chapter_OnlinePDF.pdf;258
38.1;Computational Analysis for Roughness-Based Transition Control;258
38.1.1;1 Introduction;258
38.1.2;2 Methods;259
38.1.3;3 Results;259
38.1.4;4 Conclusions;263
38.1.5;References;263
39;186838_1_En_38_Chapter_OnlinePDF.pdf;264
39.1;Statistics of turbulent-to-laminar transition in plane Couette flow;264
39.1.1;1 Introduction;264
39.1.2;2 Model and Results;265
39.1.3;References;267
40;186838_1_En_39_Chapter_OnlinePDF.pdf;268
40.1;Spectra of Swirling Flow;268
40.1.1;1 Introduction;268
40.1.2;2 Linear asymptotical stability analysis;269
40.1.3;3 Optimal transient growth analysis;270
40.1.4;4 Map of spectra;271
40.1.5;5 Conclusion;273
40.1.6;References;273
41;186838_1_En_40_Chapter_OnlinePDF.pdf;274
41.1;Localized edge states for the transition to turbulence in shear flows;274
41.1.1;1 Introduction;274
41.1.2;2 Numerical methods and results;276
41.1.3;3 Conclusions;278
41.1.4;References;279
42;186838_1_En_41_Chapter_OnlinePDF.pdf;280
42.1;Active steady control of vortex shedding: an adjoint-based sensitivity approach;280
42.1.1;1 Introduction;280
42.1.2;2 Global stability of the cylinder flow;281
42.1.3;3 Adjoint-based sensitivity approach;282
42.1.4;4 Results;283
42.1.5;References;285
43;186838_1_En_42_Chapter_OnlinePDF.pdf;286
43.1;Feedback control of transient energy growth in subcritical plane Poiseuille flow;286
43.1.1;1 Introduction;287
43.1.2;2 Discretization;287
43.1.3;3 System properties;288
43.1.4;4 Control design;288
43.1.5;5 Results;289
43.1.6;6 Conclusions;291
43.1.7;References;291
44;186838_1_En_43_Chapter_OnlinePDF.pdf;292
44.1;Linear and non-linear disturbance evolution in a compressible boundary-layer with localized roughness;292
44.1.1;1 Introduction;292
44.1.2;2 Mathematical model and numerical method;293
44.1.3;3 Uncertainty quantification;294
44.1.4;4 Mean flow;294
44.1.5;5 Deterministic disturbance evolution;295
44.1.6;6 Stochastic disturbance evolution;296
44.1.7;7 Conclusion;297
44.1.8;References;297
45;186838_1_En_44_Chapter_OnlinePDF.pdf;298
45.1;Experimental Study of Boundary Layer Transition Subjected toWeak Free Stream Turbulence;298
45.1.1;1 Introducution;298
45.1.2;2 Experimental Set-up;299
45.1.3;3 Hot-wire Measurement Result and Flow Visualization;301
45.1.4;4 Conclution;303
45.1.5;References;303
46;186838_1_En_45_Chapter_OnlinePDF.pdf;304
46.1;Open-loop control of compressible afterbody flows using adjoint methods;304
46.1.1;1 Introduction;304
46.1.2;2 Theoretical framework;305
46.1.3;3 Results;307
46.1.4;4 Perspectives;308
46.1.5;References;309
47;186838_1_En_46_Chapter_OnlinePDF.pdf;310
47.1;Direct Numerical Simulation of a Swept-Wing Boundary Layer with an Array of Discrete Roughness Elements;310
47.1.1;1 Introduction;310
47.1.2;2 Flow Configuration and Numerical Method;311
47.1.3;3 Initial results and future work;313
47.1.4;References;315
48;186838_1_En_47_Chapter_OnlinePDF.pdf;316
48.1;Wave packet pseudomodes upstream of a swept cylinder;316
48.1.1;1 Introduction;316
48.1.2;2 Wave packet pseudomodes for the uniform stability problem;319
48.1.3;3 Conclusions;321
48.1.4;References;321
49;186838_1_En_48_Chapter_OnlinePDF.pdf;322
49.1;Bypass Transition prediction using a model based on transient growth theory;322
49.1.1;1 Introduction;322
49.1.2;2 Governing equations;323
49.1.3;3 Wall normal velocity fluctuation modelling;324
49.1.4;4 Results;324
49.1.5;5 Conclusion;326
49.1.6;References;327
50;186838_1_En_49_Chapter_OnlinePDF.pdf;328
50.1;Flow in a Slowly Divergent Pipe Section;328
50.1.1;1 Introduction;328
50.1.2;2 Experimental Setup;329
50.1.3;3 Results and Discussions;331
50.1.4;4 Conclusions;332
50.1.5;References;333
51;186838_1_En_50_Chapter_OnlinePDF.pdf;334
51.1;In-flight experiments on active TS-wave control on a 2D-laminar wing glove;334
51.1.1;1 Introduction;334
51.1.2;2 Experimental setup;335
51.1.3;3 Control algorithm;336
51.1.4;4 Results;337
51.1.5;5 Conclusions;339
51.1.6;References;339
52;186838_1_En_51_Chapter_OnlinePDF.pdf;340
52.1;Global nonlinear dynamics of thin aerofoil wakes;340
52.1.1;1 Introduction;340
52.1.2;2 Global nonlinear dynamics obtained by direct numerical simulations;341
52.1.3;3 Basic flow and local absolute frequencies;342
52.1.4;4 Discussion;344
52.1.5;References;345
53;186838_1_En_52_Chapter_OnlinePDF.pdf;346
53.1;Riccati-less optimal control of bluff-body wakes;346
53.1.1;1 Background;346
53.1.2;2 Riccati-less optimal control;348
53.1.3;3 Application;350
53.1.4;References;351
54;186838_1_En_53_Chapter_OnlinePDF.pdf;352
54.1;Asymptotic theory of the pre-transitional laminar streaks and comparison with experiments;352
54.1.1;1 Introduction;352
54.1.2;2 Mathematical formulation;353
54.1.3;3 Results;355
54.1.4;4 Conclusions and Outlook;356
54.1.5;References;357
55;186838_1_En_54_Chapter_OnlinePDF.pdf;358
55.1;Roughness-induced transition of compressible laminar boundary layers;358
55.1.1;1 Introduction;358
55.1.2;2 Method;359
55.1.3;3 Flow structure;360
55.1.4;4 Critical threshold;361
55.1.5;5 Conclusion;362
55.1.6;References;363
56;186838_1_En_55_Chapter_OnlinePDF.pdf;364
56.1;On receptivity and modal linear instability of laminar separation bubbles at all speeds;364
56.1.1;1 Introduction and Motivation;364
56.1.2;2 Theory and Numerical Methods;365
56.1.3;3 Results;366
56.1.3.1;3.1 Incompressible flow;366
56.1.3.1.1;3.1.1 Receptivity and sensitivity of LSB flow;366
56.1.3.1.2;3.1.2 U-separation and Stall Cells;367
56.1.3.2;3.2 Compressible flow;368
56.1.3.2.1;3.2.1 Subsonic flow: the effect of compressibility;368
56.1.3.2.2;3.2.2 Supersonic regime: SBLI and supersonic finite-angle wedge flows;368
56.1.4;References;369
57;186838_1_En_56_Chapter_OnlinePDF.pdf;370
57.1;Hypersonic instability waves measured on a circular cone at M=12 using fast-response surface heat-flux and pressure gauges;370
57.1.1;1 Introduction;370
57.1.2;2 Experimental Setup;370
57.1.3;3 Experimental Results;372
57.1.4;References;375
58;186838_1_En_57_Chapter_OnlinePDF.pdf;376
58.1;Interaction of noise disturbances and streamwise streaks;376
58.1.1;1 Introduction and Numerical Method;376
58.1.2;2 Numerical Method;377
58.1.3;3 Results;378
58.1.4;4 Conclusions;381
58.1.5;References;381
59;186838_1_En_58_Chapter_OnlinePDF.pdf;382
59.1;Experimental study on the use of the wake instability as a passive control in coaxial jet flows;382
59.1.1;1 Introduction;382
59.1.2;2 Experimental arrangement;383
59.1.3;3 Results;384
59.1.4;4 Conclusions;387
59.1.5;References;387
60;186838_1_En_59_Chapter_OnlinePDF.pdf;388
60.1;Numerical and Experimental Investigations of Relaminarizing Plane Channel Flow;388
60.1.1;1 Introduction;388
60.1.2;2 Numerical Method and Experimental Setup;389
60.1.2.1;2.1 Numerical Method;389
60.1.2.2;2.2 Experimental Facility and Measurement Technique;390
60.1.3;3 Results;390
60.1.4;4 Conclusion;393
60.1.5;References;393
61;186838_1_En_60_Chapter_OnlinePDF.pdf;394
61.1;Linear control of 3D disturbances on a flat-plate;394
61.1.1;1 Input-output configuration;394
61.1.2;2 Model reduction;396
61.1.3;3 Controller design;398
61.1.4;References;399
62;186838_1_En_61_Chapter_OnlinePDF.pdf;400
62.1;Experimental study of stability of supersonic boundary layer on swept wing;400
62.1.1;1 Introduction;400
62.1.2;2 Experimental equipment;401
62.1.3;3 Stability;402
62.1.4;4 Conclusions;404
62.1.5;References;405
63;186838_1_En_62_Chapter_OnlinePDF.pdf;406
63.1;Comparison of Direct Numerical Simulation with the Theory of Receptivity in a Supersonic Boundary Layer;406
63.1.1;1 Introduction;406
63.1.2;2 Problem formulation;407
63.1.3;3 Analysis and results;408
63.1.4;4 Conclusions;410
63.1.5;References;411
64;186838_1_En_63_Chapter_OnlinePDF.pdf;412
64.1;Instability of high Mach number flows in the presence of high-temperature gas effects;412
64.1.1;1 Introduction;412
64.1.2;2 Numerical Method;413
64.1.2.1;2.1 Results;414
64.1.2.1.1;2.1.1 Instability development in the M=20 flat plate boundary layer;414
64.1.2.2;2.2 Flow around the cuboid in the HyBoLT configuration;415
64.1.2.3;2.3 Conclusions;416
64.1.3;References;417
65;186838_1_En_64_Chapter_OnlinePDF.pdf;418
65.1;Spatially localised growth within global instabilities of flexible channel flows;418
65.1.1;1 Introduction;418
65.1.2;2 The model;419
65.1.3;3 Methods;421
65.1.4;4 Results;422
65.1.5;5 Discussion;422
65.1.6;References;423
66;186838_1_En_65_Chapter_OnlinePDF.pdf;424
66.1;Global stability of a plane liquid jet surrounded by gas;424
66.1.1;1 Introduction;424
66.1.2;2 Flow modelling, numerical implementation and verification;426
66.1.3;3 Results and discussion;428
66.1.4;4 Conclusions and outlook;429
66.1.5;References;429
67;186838_1_En_66_Chapter_OnlinePDF.pdf;430
67.1;Instabilities of flow in a corrugated pipe;430
67.1.1;1 Introduction;430
67.1.2;2 A model of corrugated pipe and stability analysis;431
67.1.3;3 Conclusions;435
67.1.4;References;435
68;186838_1_En_67_Chapter_OnlinePDF.pdf;436
68.1;The Late Nonlinear Stage of Oblique Breakdown to Turbulence in a Supersonic Boundary Layer;436
68.1.1;1 Introduction;436
68.1.2;2 Computational Setup;437
68.1.3;3 Initiating the Oblique Breakdown Mechanism;438
68.1.4;4 The Late Nonlinear Stage of Breakdown;439
68.1.5;5 Reaching Fully Developed Turbulence;440
68.1.6;6 Conclusions;441
68.1.7;References;441
69;186838_1_En_68_Chapter_OnlinePDF.pdf;442
69.1;Turbulence stripe in transitional channel flow with/without system rotation;442
69.1.1;1 Introduction;442
69.1.2;2 Numerical and experimental descriptions;443
69.1.3;3 Results;444
69.1.3.1;3.1 DNS on PPF and PCF;444
69.1.3.2;3.2 Flow visualization on PPF and RPCF;445
69.1.4;4 Conclusions;447
69.1.5;References;447
70;186838_1_En_69_Chapter_OnlinePDF.pdf;448
70.1;Direct Numerical Simulation and Theoretical Analysis of Perturbations in Hypersonic Boundary Layers;448
70.1.1;1 Introduction;448
70.1.2;2 Outline of the method;449
70.1.3;3 Numerical Approach;450
70.1.4;4 Results;450
70.1.4.1;4.1 Flat plate;450
70.1.4.2;4.2 Wedge;453
70.1.5;References;453
71;186838_1_En_70_Chapter_OnlinePDF.pdf;454
71.1;Flow Transition in Free Liquid Film Induced by Thermocapillary Effect;454
71.1.1;1 Introduction;454
71.1.2;2 Target Geometry;455
71.1.3;3 Numerical Simulation;456
71.1.4;4 Experiment;456
71.1.5;5 Results & Discussion;457
71.1.6;6 Concluding Remarks;459
71.1.7;References;459
72;186838_1_En_71_Chapter_OnlinePDF.pdf;460
72.1;Boundary layer transition by interaction of streaks and Tollmien–Schlichting waves;460
72.1.1;1 Introduction;461
72.1.2;2 Interaction of streaks and Tollmien–Schlichting waves;462
72.1.2.1;Continuous-discrete mode interactions;462
72.1.2.2;The influence of free-stream turbulence;464
72.1.3;References;465
73;186838_1_En_72_Chapter_OnlinePDF.pdf;466
73.1;Numerical Investigation of Subharmonic Resonance Triads in a Mach 3 Boundary Layer;466
73.1.1;1 Introduction;466
73.1.2;2 Computational Setup;467
73.1.3;3 Subharmonic Resonance Triad;468
73.1.4;4 DNS of Oblique-Subharmonic Resonance Triad;469
73.1.5;5 DNS of the Interaction of Oblique-Subharmonic Resonance with Oblique Breakdown;470
73.1.6;6 Conclusions;471
73.1.7;References;471
74;186838_1_En_73_Chapter_OnlinePDF.pdf;473
74.1;Transient Growth on the Homogenous Mixing Layer;473
74.1.1;1 Introduction;473
74.1.2;2 Hyperbolic Tangent Velocity Profile;474
74.1.3;3 Developing KH billow;476
74.1.4;References;476
75;186838_1_En_74_Chapter_OnlinePDF.pdf;477
75.1;Closed-loop control of cavity flow using a reduced-order model based on balanced truncation;477
75.1.1;1 Introduction;477
75.1.2;2 Configuration, modeling and model reduction;478
75.1.3;3 LQG control;478
75.1.4;4 Comparison with reduced model based on POD and global modes;480
75.1.5;5 Conclusions and Outlook;480
75.1.6;References;480
76;186838_1_En_75_Chapter_OnlinePDF.pdf;481
76.1;On the asymptotic solution of the flow around a circular cylinder;481
76.1.1;1 Introduction;481
76.1.2;2 Numerical Simulations;482
76.1.3;3 Experiments and DPIV Mesurements;482
76.1.4;4 Results: harmonic fields and amplitudes;483
76.1.5;5 Acknowledgements;484
76.1.6;References;484
77;186838_1_En_76_Chapter_OnlinePDF.pdf;485
77.1;Investigations of Suction in a Transitional Flat-Plate Boundary Layer;485
77.1.1;1 Introduction;485
77.1.2;2 Experimental setup;486
77.1.3;3 Results;487
77.1.4;4 Conclusion;488
77.1.5;References;488
78;186838_1_En_77_Chapter_OnlinePDF.pdf;489
78.1;Global three-dimensional optimal perturbations in a Blasius boundary layer;489
78.1.1;1 Introduction;489
78.1.2;2 Problem formulation;490
78.1.3;3 Results and discussion;490
78.1.4;References;492
79;186838_1_En_78_Chapter_OnlinePDF.pdf;493
79.1;Quantifying sub-optimal transient growth using biorthogonal decomposition;493
79.1.1;1 Motivation;493
79.1.2;2 Method;494
79.1.3;3 Results;495
79.1.4;References;496
80;186838_1_En_79_Chapter_OnlinePDF.pdf;497
80.1;Model reduction using Balanced Proper Orthogonal Decomposition with frequential snapshots;497
80.1.1;1 Introduction;497
80.1.2;2 Flow configuration;498
80.1.3;3 Model reduction;498
80.1.4;4 Input-output response;499
80.1.5;5 Conclusions and Outlook;500
80.1.6;References;500
81;186838_1_En_80_Chapter_OnlinePDF.pdf;501
81.1;Control of a trapped vortex in a thick airfoil by steady/unsteady mass flow suction;501
81.1.1;1 Introduction;501
81.1.2;2 Experimental Setup and Measurements Instrumentation;501
81.1.3;3 Experimental Test Campaign;502
81.1.3.1;3.1 No-Suction and Steady Suction;502
81.1.3.2;3.2 Unsteady Suction;503
81.1.4;4 Results;503
81.1.5;5 Conclusions;504
81.1.6;References;504
82;186838_1_En_81_Chapter_OnlinePDF.pdf;505
82.1;Receptivity of compressible boundary layer to kinetic fluctuations;505
82.1.1;1 Introduction;505
82.1.2;2 Analysis and results;506
82.1.3;3 Conclusions;508
82.1.4;References;508
83;186838_1_En_82_Chapter_OnlinePDF.pdf;509
83.1;Effect of transport modeling on hypersonic cooled wall boundary layer stability;509
83.1.1;1 Introduction;509
83.1.2;2 Methodology;510
83.1.3;3 Results;511
83.1.4;4 Conclusion;512
83.1.5;References;512
84;186838_1_En_83_Chapter_OnlinePDF.pdf;513
84.1;Modeling Supersonic and Hypersonic Flow Transition over Three-Dimensional Bodies;513
84.1.1;1 Introduction;513
84.1.2;2 Model formulation;514
84.1.3;3 Results and discussion;514
84.1.4;4 Conclusion;516
84.1.5;References;516
85;186838_1_En_84_Chapter_OnlinePDF.pdf;517
85.1;Amplitude threshold in the wake transition of an oscillating circular cylinder;517
85.1.1;1 Introduction;517
85.1.2;2 Results;518
85.1.3;3 Conclusions;519
85.1.4;4 Acknowledgements;520
85.1.5;References;520
86;186838_1_En_85_Chapter_OnlinePDF.pdf;521
86.1;Certain Aspect of Instability of Flow in a Channel with Expansion/Contraction;521
86.1.1;1 Introduction;521
86.1.2;2 Numerical procedure;522
86.1.3;3 Results and Discussion;523
86.1.4;References;523
87;186838_1_En_86_Chapter_OnlinePDF.pdf;525
87.1;Some properties of boundary layer under the joint effect of external flow turbulence and surface roughness;525
87.1.1;1 Introduction;525
87.1.2;2 Experiment and results;526
87.1.3;3 Conclusions;527
87.1.4;References;528
88;186838_1_En_87_Chapter_OnlinePDF.pdf;529
88.1;Wave forerunners of localized structures at the boundary layer;529
88.1.1;1 Introduction;529
88.1.2;2 Experimental set-up;529
88.1.3;3 Results;530
88.1.4;4 Conclusions;532
88.1.5;References;532
89;186838_1_En_88_Chapter_OnlinePDF.pdf;533
89.1;Experiments on the wave train excitation and wave interaction in spanwise modulated supersonic boundary layer;533
89.1.1;1 Introduction;533
89.1.2;2 Experiments set-up;534
89.1.3;3 Results;534
89.1.3.1;3.1 Initial Amplitudes of Wave Trains;535
89.1.3.2;3.2 Nonlinear Wave Train Development;535
89.1.4;4 Conclusions;536
89.1.5;References;536
90;186838_1_En_89_Chapter_OnlinePDF.pdf;537
90.1;Laminar-Turbulent Transition and Boundary Layer Separation on wavy surface wing;537
90.1.1;1 Introduction;537
90.1.2;2 Experimental Apparatus;538
90.1.3;3 Results;538
90.1.4;4 Conclusion;539
90.1.5;References;539
91;186838_1_En_90_Chapter_OnlinePDF.pdf;540
91.1;Investigation of Thermal Nonequilibrium on Hypersonic Boundary-Layer Transition by DNS;540
91.1.1;1 Gas Models;540
91.1.2;2 Results;541
91.1.3;3 Conclusions;543
91.1.4;References;543
92;186838_1_En_91_Chapter_OnlinePDF.pdf;544
92.1;Global sustained perturbations in a backward-facing step flow;544
92.1.1;1 Introduction;544
92.1.2;2 Global sustained perturbations;545
92.1.3;3 Results;547
92.1.4;References;547
93;186838_1_En_92_Chapter_OnlinePDF.pdf;548
93.1;Large Reynolds number streak description using RNS;548
93.1.1;1 RNS streak formulation;548
93.1.2;2 Results and Conclusions;550
93.1.3;3 Acknowledgments;551
93.1.4;References;551
94;186838_1_En_93_Chapter_OnlinePDF.pdf;552
94.1;Optimal disturbances with iterative methods;552
94.1.1;1 Optimal disturbances with iterative methods;552
94.1.2;2 Results;553
94.1.3;3 Conclusions;555
94.1.4;References;555
95;186838_1_En_94_Chapter_OnlinePDF.pdf;556
95.1;Connection between full-lifetime and breakdown of puffs in transitional pipe flows;556
95.1.1;1 Introduction;556
95.1.2;2 Experimental test rig;557
95.1.3;3 Measurement of a full-lifetime of puffs and a rate of splitting puffs’ occurrence;557
95.1.4;4 Conclusions and final remarks;558
95.1.5;References;559
96;186838_1_En_95_Chapter_OnlinePDF.pdf;560
96.1;Effect of oblique waves on jet turbulence;560
96.1.1;1 Introduction;560
96.1.2;2 Motivation for experiments;561
96.1.3;3 Results and Discussion;562
96.1.4;References;563
97;186838_1_En_96_Chapter_OnlinePDF.pdf;564
97.1;The effect of a single three-dimensional roughness element on the boundary layer transition;564
97.1.1;1 Introduction;564
97.1.2;2 Experimental Set-up and Results;565
97.1.3;3 Final remarks;565
97.1.4;References;567
98;186838_1_En_97_Chapter_OnlinePDF.pdf;568
98.1;Experimental study of resonant interactions of modulated waves in a non self-similar boundary layer;568
98.1.1;1 Introduction;568
98.1.2;2 Results;569
98.1.3;3 Conclusions;570
98.1.4;References;571
99;186838_1_En_98_Chapter_OnlinePDF.pdf;572
99.1;High Reynolds Number Transition Experiments in ETW (TELFONA project);572
99.1.1;1 Introduction;572
99.1.2;2 Model Design and measurement systems;573
99.1.3;3 Analysis and stabilty calculations;574
99.1.4;4 Conclusion;575
100;186838_1_En_99_Chapter_OnlinePDF.pdf;576
100.1;Entropy generation rate in turbulent spots in a boundary layer subject to freestream turbulence;576
100.1.1;1 Introduction;576
100.1.2;2 Results and Discussion;577
100.1.2.1;2.1 Spot Evolution;577
100.1.2.2;2.2 Entropy generation;578
100.1.3;3 Conclusions;578
100.1.4;References;579
101;186838_1_En_100_Chapter_OnlinePDF.pdf;580
101.1;The Effect of a Particle travelling through a Laminar Boundary Layer on Transition;580
101.1.1;1 Background;580
101.1.2;2 ExperimentalWork;581
101.1.3;3 NumericalWork;582
101.1.4;4 Concluding Remarks;583
101.1.5;References;583
102;186838_1_En_101_Chapter_OnlinePDF.pdf;584
102.1;Flow past a plate with elliptic leading edge: layer response to free-stream vorticity;584
102.1.1;1 Introduction;584
102.1.2;2 Flow Model and Numerical Approach;585
102.1.3;3 Results;585
102.1.4;References;587
103;186838_1_En_102_Chapter_OnlinePDF.pdf;588
103.1;Fluctuation Measurements in the Turbulent Boundary Layer of a Supersonic Flow;588
103.1.1;1 Introduction;588
103.1.2;2 Experimental Facility;589
103.1.3;3 Measurement Devices and Data Evaluation;589
103.1.4;4 Results and Discussion;590
103.1.5;5 Conclusions and Outlook;591
103.1.6;References;591
104;186838_1_En_103_Chapter_OnlinePDF.pdf;592
104.1;Experimental characterization of the transition region in a rotating-disk boundary layer;592
104.1.1;1 Introduction;592
104.1.2;2 Experimental setup;593
104.1.3;3 Mean-velocity profiles;593
104.1.4;4 Spectral analysis;593
104.1.5;5 Conclusions and outlook;595
104.1.6;References;595
105;186838_1_En_104_Chapter_OnlinePDF.pdf;596
105.1;Nonlinear Interaction BetweenWavepackets in Plane Poiseuille Flow;596
105.1.1;1 Introduction;596
105.1.2;2 Equations, Numerical Methods and Initial Condition;597
105.1.3;3 Results;597
105.1.4;4 Final Remarks;598
105.1.5;References;599
106;186838_1_En_105_Chapter_OnlinePDF.pdf;600
106.1;Effects of Passive PorousWalls on Hypersonic Boundary Layers;600
106.1.1;1 Introduction;600
106.1.2;2 Linear Stability Problem;601
106.1.3;3 Results;602
106.1.4;4 FutureWork;602
106.1.5;References;603
107;186838_1_En_106_Chapter_OnlinePDF.pdf;604
107.1;Global Instabilities inWall Jets;604
107.1.1;1 Introduction;604
107.1.2;2 Formulation and Numerical Method;605
107.1.3;3 Results;605
107.1.4;4 Conclusions;607
107.1.5;References;607
108;186838_1_En_107_Chapter_OnlinePDF.pdf;608
108.1;Spatial Optimal Disturbances in Three-Dimensional Boundary Layers;608
108.1.1;1 Introduction;608
108.1.2;2 Methodology;609
108.1.3;3 Results;610
108.1.4;References;611
109;186838_1_En_108_Chapter_OnlinePDF.pdf;612
109.1;Influence of turbulence scale and shape of leading edge on laminar-turbulent transition induced by free-stream turbulence;612
109.1.1;1 Introduction;612
109.1.2;2 Linear receptivity theory to FST;613
109.1.3;3 Experimental results;614
109.1.4;References;615
110;186838_1_En_109_Chapter_OnlinePDF.pdf;616
110.1;Bifurcation characteristics of the channel flow on a rotating system undergoing transition under the influence of the Coriolis force;616
110.1.1;1 Introduction and scope of the present work;616
110.1.2;2 The governing equations;617
110.1.3;3 Outline of the method;617
110.1.4;4 Conclusions and Outlook;619
110.1.5;References;619
111;186838_1_En_110_Chapter_OnlinePDF.pdf;620
111.1;Linear Stability Investigations of Flow Over Yawed Anisotropic CompliantWalls;620
111.1.1;1 Introduction;620
111.1.2;2 Theoretical Model of the Yawed AnisotropicWall;620
111.1.3;3 Numerical Method and Code Validation;621
111.1.4;4 Results;622
111.1.5;5 Conclusions;622
111.1.6;References;623
112;186838_1_En_BookBackmatter_OnlinePDF.pdf;624
112.1;Author Index;624
113.1;Part I Invited Presentations;24
114.1;Part II Oral Presentations;89
115.1;Part III Poster Presentations;472