Investigation of the effect of an anisotropy-resolving subgrid-scale model on budgets of the Reynolds stresses

Research output: Contribution to conferencePaper

Abstract

In large eddy simulation (LES), the prediction accuracy of the mean velocity is closely related to that of the ensemble-averaged Reynolds (Re) shear stress that consists of the resolved grid-scale (GS) and unresolved subgrid-scale (SGS) parts. It is generally understood that an SGS model plays a role of compensating the lack of the GS part that is originally cut off through a filtering process. Besides this basic role, however, it is expected that an SGS model directly influences instantaneous vortex motions through the momentum equations, leading to a change of the distribution of the averaged GS stresses because the instantaneous fluctuation of the SGS stress is closely related to that of the strain rate in the budget of the GS part. In the present study, to discuss this problem in more detail, an anisotropy-resolving SGS model was carefully investigated. We focused mainly on the contribution of the SGS stress to the prediction accuracy of the ensemble-averaged resolved GS stress through its budget.

Original languageEnglish
Publication statusPublished - Jan 1 2019
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: Jul 30 2019Aug 2 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
CountryUnited Kingdom
CitySouthampton
Period7/30/198/2/19

All Science Journal Classification (ASJC) codes

  • Atmospheric Science
  • Aerospace Engineering

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    Abe, K. I. (2019). Investigation of the effect of an anisotropy-resolving subgrid-scale model on budgets of the Reynolds stresses. Paper presented at 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019, Southampton, United Kingdom.