An artificial dissipation model, including boundary treatment, that is employed in many central difference schemes for solving the Euler and Navier-Stokes equations is discussed. Modifications of this model such as the eigenvalue scaling suggested by upwind differencing are examined. Multistage time stepping schemes with and without a multigrid method are used to investigate the effects of changes in the dissipation model on accuracy and convergence. Improved accuracy for inviscid and viscous airfoil flows is obtained with the modified eigenvalue scaling. Slower convergence rates are experienced with the multigrid method using such scaling. The rate of convergence is improved by applying a dissipation scaling function that depends on mesh cell aspect ratio.
|Number of pages||15|
|State||Published - 1987|
|Event||8th Computational Fluid Dynamics Conference, 1987 - Honolulu, United States|
Duration: 9 Jun 1987 → 11 Jun 1987
|Conference||8th Computational Fluid Dynamics Conference, 1987|
|Period||9/06/87 → 11/06/87|