On the Coupling between a High-order Spectral Difference Method and Large Eddy Simulation
نویسندگان
چکیده
The filtered fluid dynamic equations are discretized in space by a high-order spectral difference(SD) method coupled with large eddy simulation (LES) approach. The subgrid-scale stress tensor is modelled by the wall-adapting local eddy-viscosity model (WALE). We solve the unsteady equations by advancing in time using a second-order backward difference formula (BDF2). The nonlinear algebraic system arising from the time discretization is solved with the nonlinear lower-upper symmetric Gauss-Seidel (LU-SGS) algorithm. As test cases, the 2D turbulent flow past a square cylinder at Re = 2.2 × 10 and the 3D turbulent flow in a muffler at Re = 4.64×10 have been computed and the results compared with available solutions and obtained experimental data. A good agreement between the results is observed.
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