A Nonreflecting Outflow Boundary Condition for Subsonic NavierStokes Calculations
Abstract
A nonreflecting boundary condition is presented for the numerical solution of the timedependent compressible NavierStokes equations when these equations are used to obtain a steady state. This boundary condition is shown to be effective in reducing reflections at a subsonic outflow boundary. Numerical calculations using a model problem were made to compare this boundary condition with other outflow boundary conditions. The nonreflecting boundary condition contains a parameter whose optimal value is estimated using the analysis of a simplified set of equations.
 Publication:

Journal of Computational Physics
 Pub Date:
 June 1980
 DOI:
 10.1016/00219991(80)901746
 Bibcode:
 1980JCoPh..36...55R
 Keywords:

 Boundary Conditions;
 Boundary Value Problems;
 Compressible Flow;
 Computational Fluid Dynamics;
 NavierStokes Equation;
 Subsonic Flow;
 Flow Equations;
 Mathematical Models;
 Steady Flow;
 Time Dependence;
 Transient Response;
 Fluid Mechanics and Heat Transfer