TY - CONF
T1 - Investigation of the effect of an anisotropy-resolving subgrid-scale model on budgets of the Reynolds stresses
AU - Abe, Ken ichi
N1 - Funding Information:
The present computation was primarily carried out using the computer facilities at the Research Institute for Information Technology, Kyushu University, Japan. This research was supported by a collaborative research program with the research association of Automotive Internal Combustion Engines (AICE) for fiscal year 2019, JSPS KAKENHI Grant Number JP16K05042, JP19K12005 and the “Advanced Computational Scientific Program” of the Research Institute for Information Technology, Kyushu University, Japan.
Publisher Copyright:
© 2019 International Symposium on Turbulence and Shear Flow Phenomena, TSFP. All rights reserved.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85084020060&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85084020060&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85084020060
T2 - 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
Y2 - 30 July 2019 through 2 August 2019
ER -