Efficient Large-eddy Simulations of Low Mach Number Flows Using Preconditioning and Multigrid

In the present paper, an implicit time accurate approach combined with multigrid, preconditioning and residual smoothing is used for the large-eddy simulation (LES) of low Mach number flow. In general, due to the restriction imposed on the time step by the physics of the flow, the advantage of an implicit method over an explicit one for LES is not obvious. It is shown that for the test cases considered in this paper, the present approach allows an efficiency gain of a factor 4–7 compared to the use of a purely explicit approach. The efficiency varies according to the test case, grid clustering, physical time step and requested residual drop. Numerical difficulties are catalogued and mitigatory procedures are introduced. Several problems with available experimental and DNS data are employed to verify the efficiency of the method.

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