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The influence of 3D spatial grid structure on a quality of the numerical modeling of viscous compressible gas flow at Mach number equal to 3 near a forward-facing part of a rectangular cylinder is demonstrated. The obtained results show that the grid structure produces critical effects on the shape and the intensity of the head shock wave, which can exceed the influence of other numerical effects. The calculations are performed using a finite volume method implemented for regularized or quasi-gasdynamic equations.

On the influence of a spatial grid structure on numerical simulation of a shock wave in a flow around 3D model