Shock propagation in meshes with large aspect ratio cells
Abstract
The cell-centered formulation of artificial viscosity has many advantages for simulating fluid flows with strong shocks. This formulation does have problems when the computational cells have large aspect radio. The problems are associated with the choice of the viscous coefficient and in particular with finding an appropriate length scale for the flow. Described is a new formulation of the artificial viscosity that preserves the advantages of the cell-centered schemes, and also works well for long thin cells. Discussed is the use of a nonsymmetric viscous stress tensor and how it yields superior results when applied with appropriate boundary conditions. These results are summarized from a more formal report (UCRL--53882), which contains the detailed mathematical analysis of these results.
- Publication:
-
Presented at the Nuclear Explosives Code Developer's Conference
- Pub Date:
- September 1988
- Bibcode:
- 1988mecd.confR....M
- Keywords:
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- Aspect Ratio;
- Mesh;
- Shock Wave Propagation;
- Viscous Flow;
- Computerized Simulation;
- Stresses;
- Fluid Mechanics and Heat Transfer