Improved ALE mesh velocities for complex flows |
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Authors: | Jozsef Bakosi Jacob Waltz Nathaniel Morgan |
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Affiliation: | Los Alamos National Laboratory, Los Alamos, NM, USA |
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Abstract: | 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. 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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Keywords: | arbitrary Lagrangian‐Eulerian unstructured grids shock hydrodynamics |
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