Multicomponent real gas 3-D-NSCBC for direct numerical simulation of reactive compressible viscous flows
The topic of this paper is to propose an extension of the classical one-dimensional NavierStokes boundary conditions (1-D-NSCBC) for real gases initially developed by Okongo and Bellan [1] to a 3-D-NSCBC formulation based on the work of Lodato et al. [2] and Coussement et al. [3]. All the differences due to the real gas formulation compared to the perfect gas formulation proposed in [3] are emphasized. A new way of determining the pressure relaxation coefficient is introduced for handling transcritical flows crossing the boundary. The real gas 3-D-NSCBC are then challenged on several test cases: a two-dimensional subsonic vortex convection, a subsonic supercritical bubble convection and a flame vortex interaction. All these test cases are performed by direct numerical simulation of multicomponent flows. It shows the stability of the boundary conditions without creating any numerical artifact.
real gas computational fluid dynamics compressible reactive flows combustion characteristic boundary conditions nscbc