Iutam Symposium on Unsteady Separated Flows and Their Control: Proceedings of the Iutam Symposium "Unsteady Separated Flows and Their Control", Corfu,

ISBN-13: 9781402098970 / Angielski / Miękka / 2009 / 586 str.

Marianna Braza; K. Hourigan

Opis

This Volume is the Proceedings of the IUTAM Symposium on Unsteady Separated Flows and Their Control held in Corfu, Greece, 18-22 June 2007. This was the second IUTAM Symposium on this subject, following the symposium in Toulouse, in April 2002. The Symposium consisted of single plenary sessions with invited lectures, - lected oral presentations, discussions on special topics and posters. The complete set of papers was provided to all participants at the meeting. The thematic sessions of this Symposium are presented in the following: Experimental techniques for the unsteady ow separation Theoretical aspects and analytical approaches of ow separation Instability and transition Compressibility effects related to unsteady separation Statistical and hybrid turbulence modelling for unsteady separated ows Direct and Large-Eddy Simulation of unsteady separated ows Theoretical/industrial aspects of unsteady separated ow control This IUTAM Symposium concerned an important domain of Theoretical and Applied Mechanics nowadays. It focused on the problem of ow separation and of its control. It achieved a uni ed approach regrouping the knowledge provided from theoretical, experimental, numerical simulation and modelling aspects for unsteady separated ows (incompressible and compressible regimes) and included ef cient control devices to achieve attenuation or suppression of separation. The subject - eas covered important themes in the domain of fundamental research as well as in the domain of applications.

Spis treści

C.H.K. Williamson, Cornell Univ., USA; Opening lecture: Effects of unsteady separated flow phenomena in vortex-induced vibrations -abstract- ; T. Leweke, M.C. Thompson, G.J. Sheard, L. Schouveiler & K. Hourigan; Invited keynote lecture: Unsteady flow around impulsively stopped bluff bodies -abstract- ; M. Provansal & P. Monkewitz; Invited keynote lecture Vortex shedding dynamics in the laminar wakes of various bluff bodies (cylinders, spheres and cones) -abstract- ; M.S. Adaramola, D. Sumner & D.J. Bergstrom: Effect of velocity ratio on the streamwise vortex structures in the wake of a stack ; A. Fouras, D. Lo Jacono, G. J. Sheard & K. Hourigan: Measurement of instantaneous velocity and surface topography of a cylinder at low Reynolds number ; M. Gohlke, J.F. Beaudoin, M. Amielh & F. Anselmet: Effect of unsteady separation on an automotive bluff-body in cross-wind; K. Gumowski, J. Miedzik, S. Goujon-Durand, G. Bouchet, P. Jenffer & J.E. Wesfreid; Wake behind a sphere: experimental and numerical investigations; H. Park & H. Choi: Investigation of aerodynamic capabilities of flying fish in gliding flight ; R. Perrin, M. Braza, E. Cid, S. Cazin, P. Chassaing, C. Mockett, T. Reimann & F. Thiele: Coherent and turbulent process analysis in the flow past a circular cylinder at high Reynolds number ; D. Sumner, H.B. Hemingson, D.M. Deutscher & J.E. Barth: PIV measurements of the flow around oscillating cylinders at low KC numbers ; K.K.Y. Tsang, R.C.K. Leung & R.M.C. So; Unsteady force measurements of an airfoil undergoing dynamic stall at low Reynolds number; T. Weier, C. Ciepka & G. Gerbeth: Coherent structure eduction from PIV data of an electromagnetically forced separated flow; Posters of Session I; M. Fuchiwaki & K. Tanaka: Detailed wake structure behind unsteady airfoils and characteristics of dynamic thrust ; S.C. Luo, T.T.L. Duong & Y.T. Chew: Flow separation of a rotating cylinder; S.D. Sharma & A.A. Kumar: Unsteady flow behind a blunt based POD model; Session II: Statistical and hybrid turbulence modeling of unsteady separated flows; T. B. Gatski; Invited keynote lecture: Prediction methodologies for non-stationary turbulent flows -abstract- ; W. Haase; Invited keynote lecture: DESider - Detached Eddy Simulation for Industrial Aerodynamics; P. Sagaut; Invited keynote lecture: On the use of LES for flow control: the compressible cavity flow case -abstract- ; G. Barakos, S. Lawson, R. Steijl & Punit Nayyar: Assessment of flow control devices for transonic cavity flows using DES and LES; R. Bourguet, M. Braza, R. Perrin & G. Harran: Physical analysis of an anisotropic eddy viscosity concept for strongly detached unsteady flows; R. Elakoury, M. Braza, Y. Hoarau, J. Vos, G. Harran & A. Sevrain: Unsteady flow around a NACA0021 airfoil beyond stall at 60° angle of attack; O. Frederich, U. Bunge, C. Mockett & F. Thiele: Flow prediction around an oscillating NACA0012 at Re=1000 000; E. Guilmineau & F. Chometon : Experimental and numerical study of unsteady wakes behind an oscillating car model; R.B. Langtry & P.R. Spalart: Detached Eddy Simulation of a nose landing-gear cavity; G. Martinat, M. Braza, G. Harran, A. Sevrain, Y. Hoarau & D. Favier: Dynamic stall of a pitching and horizontally oscillating airfoil ; C. Mockett, R. Perrin, T. Reimann, M. Braza & F. Thiele: Analysis of Detached-Eddy Simulation for the flow around a circular cylinder with reference to PIV data; J. Paik, C. Escauriaza & F. Sotiropoulos: On the coherent dynamics of turbulent junction flows ; M.V. Salvetti, B. Koobus, S. Camarri & A. Dervieu: Simulation of bluff-body flows through a hybrid RANS/VMS-LES model; S. Schmid, T. Lutz & E. Krämer: Simulation of the unsteady cavity flow of the stratospheric

Blurb

Unsteady separated flows are an important topic in theoretical and applied mechanics. The IUTAM Symposium held in Corfu in 2007 (and following on from a previous meeting in Toulouse in 2002) aimed at achieving a unified approach which will regroup the knowledge coming from theoretical, experimental, numerical simulation, modeling and flow-control aspects of separated unsteady flows with respect to incompressible and compressible flow regimes. The subject areas are receiving a great deal of impetus from international research groups, stimulated by major research programs related to this topic, involving major industrial companies especially in aeronautics in various countries and by heading government programs. The symposium brought together groups of researchers working on problems related to the understanding and the prediction of unsteady, separated flows. The present IUTAM symposium proceedings volume is an essential extension of the topic to control theory and applications in respect of unsteady separated flows.

Topics addressed include physical aspects of the dynamics related to unsteady separation in incompressible flows and flows under compressibility effects, and the state of the art methods for modeling these kinds of flows in high Reynolds numbers. Special attention is paid to control theory and applications, especially including feed-back effects for the attenuation of unsteadiness and of flow separation. The understanding of the flow-physics and their efficient turbulence modeling remains a serious problem in a number of engineering applications, including Aeronautics and Aeroelasticity. Furthermore, the study of advanced flow modeling techniques, especially to control high-Reynolds number transitional and turbulent flows involving unsteady separation, is a crucial need in the above-mentioned domains of fundamental and applied research nowadays.

This work is of interest to people working in experimental investigation of unsteady separated flows, those working in the numerical simulation and turbulence modeling of these flows and those working in the domain of control theory. The symposium proceedings contributes to a better insight of this important category of flows from a fundamental and applied research point of view by means of a synergy among the three main approaches: theoretical, experimental and prediction methods.