Effect of artificial viscosity on three-dimensional flow solutions

Eli Turkel, Veer N. Vatsa

Research output: Contribution to conferencePaperpeer-review

Abstract

Artificial viscosity is added either implicitly or explicitly in practically every numerical scheme for suppressing spurious oscillations in the solution of fluid-dynamics equations. In the present central-difference scheme, artificial viscosity is added explicitly for suppressing high frequency oscillations and achieving good convergence properties. The amount of artificial viscosity added is controlled through the use of pre-selected coefficients. In the standard scheme, scalar coefficients based on the spectral radii of the Jacobian of convective fluxes are used. However, this can add too much viscosity to the slower waves. Hence, use of matrix-valued coefficients, which give appropriate viscosity for each wave component is suggested. With the matrix-valued coefficients, the central-difference scheme produces more accurate solutions on a given grid, particularly in the vicinity of shocks, while still maintaining good convergence properties.

Original languageEnglish
DOIs
StatePublished - 1990
EventAIAA 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1990 - Seattle, United States
Duration: 18 Jun 199020 Jun 1990

Conference

ConferenceAIAA 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1990
Country/TerritoryUnited States
CitySeattle
Period18/06/9020/06/90

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