Seventh IUTAM Symposium on Laminar-Turbulent Transition : proceedings of the Seventh IUTAM Symposium on Laminar-Turbulent Transition : Stockholm, Sweden, 2009 [June 23-26

The origins of turbulent flow and the transition from laminar to turbulent flow are the most important unsolved problems of fluid mechanics and aerodynamics. Besides being a fundamental question of fluid mechanics, there are numerous applications relying on accurate information regarding transition location and the details of the subsequent turbulent flow. While considerable progress has been made in the understanding of laminar-turbulent transition over the last 30 years, the continuing increase in computer power as well as new theoretical developments are now revolutionizing the area. This volume contains 110 papers of presentations delivered during the "Seventh IUTAM Symposium on Laminar-Turbulent Transition" in Stockholm, Sweden, June 2009. The areas of emphasis include: Novel approaches to receptivity analysis and transition modelling. Non-normal effects and global modes. Stability of complex flows, such as non-Newtonian and miscible-interface flows. Transition in simple shear flows and its relation to properties of non-linear dynamical systems. Modern feedback control and design techniques applied to transition. Transition in high-speed flows. Direct and Large-Eddy Simulation of transition. Applied Laminar Flow Control. Front Matter....Pages 1-23 Front Matter....Pages 1-1 A Gradient-based Optimization Method for Natural Laminar Flow Design....Pages 3-10 A Thermodynamic Lower Bound on Transition-Triggering Disturbances....Pages 11-18 Hypersonic boundary layer transition and control....Pages 19-26 Instabilities of Miscible Interfaces....Pages 27-34 Large-eddy simulations of relaminarization due to freestream acceleration....Pages 35-42 Reduced-order models for flow control: balanced models and Koopman modes....Pages 43-50 The description of fluid behavior by coherent structures....Pages 51-58 Instability of uniform turbulent plane Couette flow: spectra, probability distribution functions and K – Ω closure model....Pages 59-66 Front Matter....Pages 68-68 Sensitivity to base-flow variation of a streamwise corner flow....Pages 69-74 Transition Control Testing in the Supersonic S2MA Wind Tunnel (SUPERTRAC project)....Pages 75-80 Breakdown of Low-Speed Streaks under High-Intensity Background Turbulence....Pages 81-86 Numerical Study on Transition of a Channel Flow with Longitudinal Wall-oscillation....Pages 87-92 Direct Numerical Simulation of the Mixing Layer past Serrated Nozzle Ends....Pages 93-98 Receptivity of a supersonic boundary layer to shock-wave oscillations....Pages 99-104 Roughness receptivity studies in a 3-D boundary layer – Flight tests and computations....Pages 105-110 DNS investigations of steady receptivity mechanisms on a swept cylinder....Pages 111-116 Experimental Study of the Incipient Spot Breakdown Controlled by Riblets....Pages 117-122 Control of Stationary Cross-flow Modes Using Patterned Roughness at Mach 3.5....Pages 123-128 Secondary optimal growth and subcritical transition in the plane Poiseuille flow....Pages 129-134 Disturbance evolution in rotating-disk boundary layers: competition between absolute instability and global stability....Pages 135-140 Front Matter....Pages 68-68 Instabilities due a vortex at a density interface: gravitational and centrifugal effects....Pages 141-146 Wave Packets of Controlled Velocity Perturbations at Laminar Flow Separation....Pages 147-152 Linear Stability Analysis for Manipulated Boundary-Layer Flows using Plasma Actuators....Pages 153-158 Stripy patterns in low- Re turbulent plane Couette flow....Pages 159-164 Characterization of the three-dimensional instability in a lid-driven cavity by an adjoint based analysis....Pages 165-170 Bi-global crossplane stability analysis of high-speed boundary-layer flows with discrete roughness....Pages 171-176 Time-resolved PIV investigations on the laminar-turbulent transition over laminar separation bubbles....Pages 177-182 Control of transient growth induced boundary layer transition using plasma actuators....Pages 183-188 Laminar Flow Control by Suction at Mach 2....Pages 189-194 Decay of turbulent bursting in enclosed flows....Pages 195-200 Local and Global Stability of Airfoil Flows at Low Reynolds Number....Pages 201-206 Numerical simulation of riblet controlled oblique transition....Pages 207-212 Transition Movement in the Wake of Protruding and Recessed Three-Dimensional Surface Irregularities....Pages 213-218 Plasma Assisted Aerodynamics for Transition Delay....Pages 219-224 Experimental study on stability of the laminar and turbulent plane jets....Pages 225-230 Evolution Of Traveling Crossflow Modes Over A Swept Flat Plate....Pages 231-236 Computational Analysis for Roughness-Based Transition Control....Pages 237-242 Statistics of turbulent-to-laminar transition in plane Couette flow....Pages 243-246 Spectra of Swirling Flow....Pages 247-252 Localized edge states for the transition to turbulence in shear flows....Pages 253-258 Front Matter....Pages 68-68 Active steady control of vortex shedding: an adjoint-based sensitivity approach....Pages 259-264 Feedback control of transient energy growth in subcritical plane Poiseuille flow....Pages 265-270 Linear and non-linear disturbance evolution in a compressible boundary-layer with localized roughness....Pages 271-276 Experimental Study of Boundary Layer Transition Subjected to Weak Free Stream Turbulence....Pages 277-282 Open-loop control of compressible afterbody flows using adjoint methods....Pages 283-288 Direct Numerical Simulation of a Swept-Wing Boundary Layer with an Array of Discrete Roughness Elements....Pages 289-294 Wave packet pseudomodes upstream of a swept cylinder....Pages 295-300 Bypass Transition prediction using a model based on transient growth theory....Pages 301-306 Flow in a Slowly Divergent Pipe Section....Pages 307-312 In-flight experiments on active TS-wave control on a 2D-laminar wing glove....Pages 313-318 Global nonlinear dynamics of thin aerofoil wakes....Pages 319-324 Riccati-less optimal control of bluff-body wakes....Pages 325-330 Asymptotic theory of the pre-transitional laminar streaks and comparison with experiments....Pages 331-336 Roughness-induced transition of compressible laminar boundary layers....Pages 337-342 On receptivity and modal linear instability of laminar separation bubbles at all speeds....Pages 343-348 Hypersonic instability waves measured on a circular cone at M=12 using fast-response surface heat-flux and pressure gauges....Pages 349-354 Interaction of noise disturbances and streamwise streaks....Pages 355-360 Experimental study on the use of the wake instability as a passive control in coaxial jet flows....Pages 361-366 Numerical and Experimental Investigations of Relaminarizing Plane Channel Flow....Pages 367-372 Linear control of 3D disturbances on a flat-plate....Pages 373-378 Front Matter....Pages 68-68 Experimental study of stability of supersonic boundary layer on swept wing....Pages 379-384 Comparison of Direct Numerical Simulation with the Theory of Receptivity in a Supersonic Boundary Layer....Pages 385-390 Instability of high Mach number flows in the presence of high-temperature gas effects....Pages 391-396 Spatially localised growth within global instabilities of flexible channel flows....Pages 397-402 Global stability of a plane liquid jet surrounded by gas....Pages 403-408 Instabilities of flow in a corrugated pipe....Pages 409-414 The Late Nonlinear Stage of Oblique Breakdown to Turbulence in a Supersonic Boundary Layer....Pages 415-420 Turbulence stripe in transitional channel flow with/without system rotation....Pages 421-426 Direct Numerical Simulation and Theoretical Analysis of Perturbations in Hypersonic Boundary Layers....Pages 427-432 Flow Transition in Free Liquid Film Induced by Thermocapillary Effect....Pages 433-438 Boundary layer transition by interaction of streaks and Tollmien–Schlichting waves....Pages 439-444 Numerical Investigation of Subharmonic Resonance Triads in a Mach 3 Boundary Layer....Pages 445-450 Front Matter....Pages 452-452 Transient Growth on the Homogenous Mixing Layer....Pages 453-456 Closed-loop control of cavity flow using a reduced-order model based on balanced truncation....Pages 457-460 On the asymptotic solution of the flow around a circular cylinder....Pages 461-464 Investigations of Suction in a Transitional Flat-Plate Boundary Layer....Pages 465-468 Global three-dimensional optimal perturbations in a Blasius boundary layer....Pages 469-472 Quantifying sub-optimal transient growth using biorthogonal decomposition....Pages 473-476 Model reduction using Balanced Proper Orthogonal Decomposition with frequential snapshots....Pages 477-480 Control of a trapped vortex in a thick airfoil by steady/unsteady mass flow suction....Pages 481-484 Front Matter....Pages 452-452 Receptivity of compressible boundary layer to kinetic fluctuations....Pages 485-488 Effect of transport modeling on hypersonic cooled wall boundary layer stability....Pages 489-492 Modeling Supersonic and Hypersonic Flow Transition over Three-Dimensional Bodies....Pages 493-496 Amplitude threshold in the wake transition of an oscillating circular cylinder....Pages 497-500 Certain Aspect of Instability of Flow in a Channel with Expansion/Contraction....Pages 501-504 Some properties of boundary layer under the joint effect of external flow turbulence and surface roughness....Pages 505-508 Wave forerunners of localized structures at the boundary layer....Pages 509-512 Experiments on the wave train excitation and wave interaction in spanwise modulated supersonic boundary layer....Pages 513-516 Laminar-Turbulent Transition and Boundary Layer Separation on wavy surface wing....Pages 517-519 Investigation of Thermal Nonequilibrium on Hypersonic Boundary-Layer Transition by DNS....Pages 521-524 Global sustained perturbations in a backward-facing step flow....Pages 525-528 Large Reynolds number streak description using RNS....Pages 529-532 Optimal disturbances with iterative methods....Pages 533-536 Connection between full-lifetime and breakdown of puffs in transitional pipe flows....Pages 537-540 Effect of oblique waves on jet turbulence....Pages 541-544 The effect of a single three-dimensional roughness element on the boundary layer transition....Pages 545-548 Experimental study of resonant interactions of modulated waves in a non self-similar boundary layer....Pages 549-552 High Reynolds Number Transition Experiments in ETW (TELFONA project)....Pages 553-556 Entropy generation rate in turbulent spots in a boundary layer subject to freestream turbulence....Pages 557-560 The Effect of a Particle travelling through a Laminar Boundary Layer on Transition....Pages 561-564 Front Matter....Pages 452-452 Flow past a plate with elliptic leading edge: layer response to free-stream vorticity....Pages 565-568 Fluctuation Measurements in the Turbulent Boundary Layer of a Supersonic Flow....Pages 569-572 Experimental characterization of the transition region in a rotating-disk boundary layer....Pages 573-576 Nonlinear Interaction Between Wavepackets in Plane Poiseuille Flow....Pages 577-580 Effects of Passive Porous Walls on Hypersonic Boundary Layers....Pages 581-584 Global Instabilities in Wall Jets....Pages 585-588 Spatial Optimal Disturbances in Three-Dimensional Boundary Layers....Pages 589-592 Influence of turbulence scale and shape of leading edge on laminar-turbulent transition induced by free-stream turbulence....Pages 593-596 Bifurcation characteristics of the channel flow on a rotating system undergoing transition under the influence of the Coriolis force....Pages 597-600 Linear Stability Investigations of Flow Over Yawed Anisotropic Compliant Walls....Pages 601-604 Back Matter....Pages 1-4 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.