USE OF THE 2ND LAW FOR ARTIFICIAL DISSIPATION IN COMPRESSIBLE FLOW DISCRETE ANALYSIS

The Second Law of Thermodynamics is applied in a predictive capacity t hrough artificial dissipation mechanisms in the solution of viscous co mpressible fluid flows. The use of the Second Law in conjunction with an entropy transport equation in the determination of the required amo unt of artificial dissipation is described in a control-volume-base co ntext. Although a user-modified dissipation coefficient is required in the scheme, the approach provides a physical basis for the applicatio n of artificial dissipation. The combination of the finite element mod el with Second Law dissipation is shown to yield highly accurate solut ions in the application to two test problems.