Abstract

Abstract Non-reflective boundary conditions are essential for many numerical flow simulations, especially when sound waves are present. This is the case for the numerical simulation of subsonic compressible flows in interior domains with moving boundaries, where the movement of the boundary will generate soundwaves. When such a flow is simulated numerically, usual boundary conditions at the in- and outflow boundary reflect the generated sound waves and cause the simulation to quickly break down. We have derived non-reflective boundary conditions for subsonic, viscous, compressible flows. In order to restrict the computational and formal effort, we only consider the two-dimensional case, the extension to three dimensions is straightforward.

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