Damping of mesh-induced errors in Free-Lagrange simulations of Richtmyer-Meshkov instability
Damping of mesh-induced errors in Free-Lagrange simulations of Richtmyer-Meshkov instability
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DOI：
10.1007/s001930000055
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发表时间：
2000-09
期刊：
影响因子：
2.2
通讯作者：
B. P. Howell;G. Ball
中科院分区：
文献类型：
--
作者：
B. P. Howell;G. Ball
Mesh-induced errors at material interfaces are identified as a source of unphysical behaviour in Lagrangian numerical simulations of Richtmyer-Meshkov instability. The mesh geometry introduces interface perturbations with wavelengths of the same order as the mesh resolution. When a shock propagates through the interface, these perturbations can grow, severely contaminating the predicted interface development. Here an algorithm is presented which damps small-scale interface perturbations. A body force is applied at the interface which depends upon the disturbance amplitude and growth rate, and which resembles surface tension. Using this technique, qualitative improvements are obtained in Free-Lagrange simulations of single-mode Richtmyer-Meshkov instability. Growth rate behaviour and the evolution of the instability are seen to agree well with previously published results.
