Abstract
Conclusions Some modi cations for the restriction and prolongation process of multigrid methods have been presented that are necessary for the simulation of complex supersonic ow elds. Damping of the restricted residual error and blending between a second-order central and a rst-order upwind prolongation enable convergence in supersonic ows and resulted in strong reductions in CPU time. The advantageof this kind of blending is the reduction to rst-order prolongationat shock waves only.
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