3-D reconnection and fluxing algorithms
We describe a robust algorithm for reconnecting a free-Lagrangian tetrahedral mesh in a 3-D hydrocode. This algorithm is an extension of an approach that was suggested by M. Fritts and J. Duckowicz and implemented by D. Fraser. Recent extensions to the original algorithm have greatly improved the reliability of the reconnection process, as well as significantly improving the conservation of important hydrodynamic quantities, such as mass, momentum, and energy. We also describe a fluxing algorithm that is robust even in the presence of inverted tetrahedra. The original algorithm was derived from the 2-D algorithm of R. A. Clark and was modified to handle the more difficult environment of the 3-D tetrahedral mesh.
Unable to display preview. Download preview PDF.
- 1.M. J. Fritts, G. Erlebacher, and P. R. Eisenman, “Adaptive Triangular Meshes,” Proceedings of the Rezoning Workshop-1983, Los Alamos National Laboratory report LA-10112-C, 1984.Google Scholar
- 2.J. K. Dukowicz, Los Alamos National Laboratory personal communication, 1987.Google Scholar
- 3.D. M. Fraser, “Tetrahedral Meshing Considerations for a Three-Dimensional FreeLagrangian Code,” Los Alamos National Laboratory report LA-UR-88-3707, 1988.Google Scholar
- 4.M. S. Sahota, “Three-Dimensional Free-Lagrangian Hydrodynamics,” Los Alamos National Laboratory report LA-UR-89-1179, April 1989.Google Scholar
- 5.V. Andronov, S. M. Bakhrakh, E. E. Meshkov, V. N. Mokhov, V. V. Nikiforov, A. V. Pevnitskii, and A. I. Tolshmyakov, Soviet Physics, JETP, No. 44, 1976, pp 424–427.Google Scholar
- 6.R. A. Clark, Los Alamos National Laboratory personal communication, 1987.Google Scholar