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| Paper: |
Adaptive Mesh Refinement Computation of Turbulent Flows – Pitfalls and Escapes |
| Volume: |
406, Numerical Modeling of Space Plasma Flows: ASTRONUM - 2008 |
| Page: |
249 |
| Authors: |
Mitran, S.M. |
| Abstract: |
New numerical procedures are introduced for the adaptive mesh refinement (AMR) computation of turbulent flows using a large eddy simulation (LES) approach. The standard AMR technique of linear interpolation of coarse grid data to obtain fine grid values is shown to introduce a spurious excitation of the turbulence spectrum. The conservative cell averaging of fine grid data to update coarse grid data has a similar effect. Interpolation and restriction procedures that eliminate this effect are introduced. These procedures can be modified to excite the small scales resolvable on new fine grids in accordance with a known turbulent energy spectrum (e.g. Kolmogorov spectrum). |
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