Improved ALE mesh velocities for complex flows

Bakosi, Jozsef; Waltz, Jacob I.; Morgan, Nathaniel Ray

doi:10.1002/fld.4403

Title: Improved ALE mesh velocities for complex flows

Journal Article · Wed May 31 04:00:00 UTC 2017 · International Journal for Numerical Methods in Fluids

DOI: https://doi.org/10.1002/fld.4403 · OSTI ID:1375162

^[1]; Waltz, Jacob I. ^[1];

^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

A key choice in the development of arbitrary Lagrangian-Eulerian solution algorithms is how to move the computational mesh. The most common approaches are smoothing and relaxation techniques, or to compute a mesh velocity field that produces smooth mesh displacements. We present a method in which the mesh velocity is specified by the irrotational component of the fluid velocity as computed from a Helmholtz decomposition, and excess compression of mesh cells is treated through a noniterative, local spring-force model. This approach allows distinct and separate control over rotational and translational modes. In conclusion, the utility of the new mesh motion algorithm is demonstrated on a number of 3D test problems, including problems that involve both shocks and significant amounts of vorticity.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: LDRD; USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1375162

Report Number(s):: LA-UR--15-28134

Journal Information:: International Journal for Numerical Methods in Fluids, Journal Name: International Journal for Numerical Methods in Fluids Journal Issue: 11 Vol. 85; ISSN 0271-2091

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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