Variable Density Turbulent Flows ERCOFTAC Special Interest Group # 24

Coordinator:

Organising Committee (in the process of being reorganized)

• Dopazo C., Sarragossa University, Spain
• Fulachier L., IRPHE, Marseille, France
• Jeandel D., Ecole Centrale, Lyon, France
• Jones W.P., Imperial College, London, U.K.
• Roekaerts D.J.E.M., TU Delft, Delft, The Netherlands
• Viollet P.L., EDF/LNH, Chatou, France

Research Topics

These turbulent flows are of fundamental interest because the conservation equations for thermodynamics, mass and momentum are linked together. Another interesting fundamental aspect is that such flows - in the jet or wake configuration - can develop self-excited oscillations related to absolute instability of the nozzle region. The understanding of these flows is an important problem in its own right but it is also the key to an improved physical understanding of combusting flows where the coupling between chemical reactions and aerodynamics occurs through local density fluctuations due to chemical heat release and composition changes. These density variations occur in many practical situations such as in the aerospace industry, in pollution and environmental problems, in engine combustion chambers, and so on.

One of the aims of the SIG is to stimulate collaboration between experimental, theoretical and numerical approaches of the problem. Another goal is to bring together researchers specialised in turbulence and those involved in combustion.

Recent Activities

New : An international summerschool, co-organized with ERCOFTAC  SIG#14 on Stably stratified and rotating turbulence, has been recently held in the Barcelona area on September 1-5, 2003.          The files corresponding to the presentations are available here.
 
• A review book, Variable Density Fluid Turbulence, co-authored by P. Chassaing, R.A. Antonia, F. Anselmet, L. Joly and S. Sarkar has been published by Kluwer Academic Publishers in June 2002, ISBN 1-4020-0671-3 (392 p., order to P. Chassaing).
• An international conference has been organized in June 2000, in Banyuls, by P. Chassaing, F. Anselmet, M. Amielh, L. Joly and L. Pietri . The scientific program was organized in four sessions and four general lectures (G.L.) were presented :
• Some comments on the last hundred years of density fluctuations (G.L. by J.L. Lumley) ;
• Particle stochastic modelling for single-phase and two-phase flows : theoretical issues, practical concerns and industrial interests (G.L. by J.P. Minier) ;
• Effects of density variation on compressible turbulent shear flows (G.L. by S. Sarkar and C. Pantano)
• Behaviour of highly accelerated variable density turbulent flows. Application to mixing preparation in internal combustion engines (G.L. by J. Boree).
The proceedings associated with the papers selected for presentation at the conference have been published by Presses Universitaires de Perpignan (ISBN 2-908912-86-4, 254 p.) - (20 Euros, order to F. Anselmet)
• An IUTAM Symposium has been organized in July 1996, in Marseille, by L. Fulachier, J.L. Lumley (Cornell Univ., USA) and F. Anselmet. The scientific program was organized into six sessions corresponding to the main themes of the Symposium and, for each of them, a general lecture (G.L.) was given :
• Theoretical and experimental studies of the instability mechanisms for low Reynolds number flows (G.L. by P. Huerre) ;
• Direct Numerical Simulations and modelling with the associated averaging problems (G.L. by P. Chassaing) ;
• Modelling and experiments, mainly with buoyancy effects (G.L. by V.A. Frost) ;
• Modelling and experiments in various flows with variable density, and industrial applications (G.L. by J.P. Chabard) ;
• Experiments and measurement methods (G.L. by R.B. Miles) ;
• Compressible flows : a comparison with low-speed variable density flows (G.L. by S.K. Lele) ;
• Selected proceedings of the Symposium have been published by Kluwer Academic Publishers (70 Euros, order to F. Anselmet)
• An ERCOFTAC Conference has been organized in September 1994, in Grenoble, by M. Favre-Marinet (LEGI-IMG) and F. Anselmet (A report on this ERCOFTAC Conference was presented in the ERCOFTAC Bulletin n° 25 (1995)).

Last revised : September 20, 2003

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