Entropy stable wall boundary conditions for the three-dimensional compressible Navier–Stokes equations

• Published in: Journal of computational physics Vol. 292; pp. 88 - 113
• Main Authors: Parsani, Matteo, Carpenter, Mark H., Nielsen, Eric J.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.07.2015
• Subjects: Boundary conditions; Compressible Navier–Stokes equations; Entropy; Entropy stability; High-order discontinuous methods; Mathematical analysis; Navier-Stokes equations; Operators; Reconstruction; SBP-SAT; Solid wall boundary conditions; Stability; Three dimensional; Compressible Navier–Stokes equations; SBP-SAT; High-order discontinuous methods; Entropy; Entropy stability; Solid wall boundary conditions
• ISSN: 0021-9991; 1090-2716
• DOI: 10.1016/j.jcp.2015.03.026

Non-linear entropy stability and a summation-by-parts framework are used to derive entropy stable wall boundary conditions for the three-dimensional compressible Navier–Stokes equations. A semi-discrete entropy estimate for the entire domain is achieved when the new boundary conditions are coupled with an entropy stable discrete interior operator. The data at the boundary are weakly imposed using a penalty flux approach and a simultaneous-approximation-term penalty technique. Although discontinuous spectral collocation operators on unstructured grids are used herein for the purpose of demonstrating their robustness and efficacy, the new boundary conditions are compatible with any diagonal norm summation-by-parts spatial operator, including finite element, finite difference, finite volume, discontinuous Galerkin, and flux reconstruction/correction procedure via reconstruction schemes. The proposed boundary treatment is tested for three-dimensional subsonic and supersonic flows. The numerical computations corroborate the non-linear stability (entropy stability) and accuracy of the boundary conditions.