A multilevel algorithm for large eddy simulation of turbulent compressibleflows

A multilevel method for Large-Eddy Simulation of turbulent unsteady compres sible flows is proposed. It relies on the splitting of the turbulent flowfi eld into several frequency bands in space and time, each band being associa ted to a computational grid in physical space, allowing to take into accoun t in a deterministic way the information contained on finer grids. A subgri d-scale model adapted to such a decomposition based on a generalization of the Germane's identity to multilevel decomposition - is also introduced. Th e approach is validated by a simulation in a subsonic plane channel flow co nfiguration. (C) 2000 Academie des sciences/Editions scientifiques et medic ales Elsevier SAS.