Zonal approach for unsteady Reynolds-averaged Navier Stokes (URANS) problem solution is described. Original feature of this approach is to use Courant Friedrichs Levi number CFL ∼ 1 in the main part of calculation domain excluding thin part of boundary layer. It is achieved by using explicit numerical scheme with fractional time stepping in the main part of calculation domain. In the near-wall zone of boundary layer, implicit dual stepping method is used. In addition to zonal approach, fully implicit method with dual stepping technology is also implemented. The methods are veri¦ed in comparison with the results of test case data obtained by consortium participants within DeSiReH FP-7 project.
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