Abstract
In this paper, the numerical dissipation properties of the Spectral Difference (SD) method are studied in the context of vortex dominated flows and wall-bounded turbulence, using uniform and distorted grids. First, the validity of using the SD numerical dissipation as the only source of subgrid dissipation (the so-called Implicit-LES approach) is assessed on regular grids using various polynomial degrees (namely, p = 3, p = 4, p = 5) for the Taylor-Green vortex flow configuration at R e = 5 000. It is shown that the levels of numerical dissipation greatly depend on the order of accuracy chosen and, in turn, lead to an incorrect estimation of the viscous dissipation levels. The influence of grid distortion on the numerical dissipation is then assessed in the context of finite Reynolds number freely-decaying and wall-bounded turbulence. Tests involving different amplitudes of distortion show that highly skewed grids lead to the presence of small-scale, noisy structures, emphasizing the need of explicit subgrid modeling or regularization procedures when considering coarse, high-order SD computations on unstructured grids. Under-resolved, high-order computations of the turbulent channel flow at R e τ = 1000 using highly-skewed grids are considered as well and present a qualitatively similar agreement to results obtained on a regular grid.
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Acknowledgments
The use of the SD solver originally developed by Antony Jameson’s group at Stanford university, and joint financial support from the Agence Nationale de la Recherche (ANR) and Fondation de Recherche pour l’Aéronautique et l’Espace (FRAE) under Grant No. ANR-14-CE05-0029 are gratefully acknowledged. This work was granted access to the HPC resources of IDRIS-CNRS under the allocation i2015-2a7361. The Haute Normandie Computing center CRIANN is also acknowledged. The authors declare that they have no conflict of interest.
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Chapelier, JB., Lodato, G. Study of the Spectral Difference Numerical Dissipation for Turbulent Flows Using Unstructured Grids. Flow Turbulence Combust 99, 643–664 (2017). https://doi.org/10.1007/s10494-017-9847-5
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DOI: https://doi.org/10.1007/s10494-017-9847-5