Large-eddy simulation (LES) has evolved into a powerful tool of central importance in the study of turbulence not only because of its capabilities of predicting fluctuating quantities like the source term for aero-acoustic simulations, but also because of its improved accuracy compared to the numerically less expensive Reynolds Averaged Navier-Stokes Simulations (RANS). In this sense, LES can be regarded as key-technology for new developments in computational aero-acoustics (CAA), in fluid-structure interactions, fatigue analysis, aerodynamics, process technology etc. The scope of this colloquium will cover recent developments in the field of LES of complex flows including: modelling and analysis of subgrid scales, numerical issues in particular for complex geometries, detached-eddy simulation technique (DES) and RANS-LES coupling, flows simulations in the fields of acoustics, aero-and hydro-dynamics, combustion and magneto-hydrodynamics. Moreover, discussions and cross-over comparisons will be performed around several generic configurations and practically relevant problems provided by the European French German research group CNRS/DFG GDRE benchmarks. The potential of approximate boundary conditions, LES/RANS coupling, newly developed SGS models and discretization schemes for useful predictions of complex flows will be compared with reference data from carefully designed experimental studies as well as databases from high-resolution numerical simulations provided by these test cases.
LESTAC will deliver an up-to-date vision of the state of the art of LES in a broad range of applications. Hosted within the French Mechanical Conference this colloquium will be held under the auspices of the European CNRS/DFG Network, AFM (Association Fran?aise de M?canique) and its special interest group on Fluid Mechanics and Turbulence (GST13) , ERCOFTAC (SIG 1) and EUROMECH.
Authors wishing to contribute to the colloquium are invited to submit a short abstract of 500 characters directly on the web page of the CFM09 (http://www.cfm2009.cnrs-mrs.fr), by Monday January 12th. The organizers will invite contributors to submit full length papers to an ERCOFTAC publication.