A Multilevel / Multiresolution Approach for Large-eddy Simulation
نویسندگان
چکیده
To reduce the computational costs in Large-Eddy Simulations of turbulent flows, a multilevel method is introduced. It relies on the splitting of the turbulent flowfield into several frequency bands in space and time, each band being associated to a computational grid in physical space. The method allows to take into account in a deterministic way the information contained on finer grids, and minimizes the modeled part on the coarser grids. Several possible closures for the subgrid terms at each level are investigated. A subgrid model adapted to such a decomposition based on a generalization of the Germano’s identity to multilevel decomposition is introduced. A reduction of the computing time is obtained by using a cycling strategy based on a small scale dynamics quasi-static approximation. The approach is assessed by a two-level simulation in a compressible subsonic plane channel flow configuration.
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