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arXiv · 2506.21065

Entropy-stable in- and outflow boundary conditions for the compressible Navier-Stokes equations

Magnus Svärd·Anita Gjesteland
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Abstract

We propose inflow and outflow boundary conditions for the compressible Navier-Stokes equations and prove that they allow a priori estimates of the entropy, mass and total energy. Furthermore, we demonstrate how to approximate these boundary conditions in conjunction with an entropy-stable finite-volume scheme. The method is also applicable to other types of entropy-stable schemes. Finally, we carry out some numerical computations with the finite-volume scheme and demonstrate their robustness.

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Magnus Svärd, Anita Gjesteland. 2025-06-26. Entropy-stable in- and outflow boundary conditions for the compressible Navier-Stokes equations. https://arxiv.org/abs/2506.21065

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