Nonreflecting boundary conditions and their application to subsonic gas dynamics

The problem of setting artificial boundary conditions at outer boundaries of a computational domain is considered. Discussed is both the general problem of mathematical physics and the case of external subsonic viscous gasflow. Nonreflecting boundary conditions for the one-dimensional Euler equations are implemented to numerical algorithms for modeling external flows, allowing for nonlinearity, twodimensionality, and discretization effects. Computations are performed of low Mach-number flows.