摘要: The present report investigates the use of unsteady compressible flow problems. For low speed system is stiff since ratio convective sound very small. To overcome this difficulty we alter time dependency equations while retaining same steady state operator. In order to achieve high numerical resolution also artificial dissipation scheme. definition preconditioners and terms can be formulated conveniently by using other sets dependent variables rather than conservative variables. effects different preconditioners, grid density on accuracy convergence solutions are presented in detail. results obtained for inviscid viscous 2D 3D flows indicate that efficient multigrid computations with Mach numbers now.
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