A dynamic global-coefficient mixed subgrid-scale model for large-eddy simulation of turbulent flows
SCIE
SCOPUS
- Title
- A dynamic global-coefficient mixed subgrid-scale model for large-eddy simulation of turbulent flows
- Authors
- Singh, S; You, D
- Date Issued
- 2013-08
- Publisher
- ELSEVIER SCIENCE INC
- Abstract
- A dynamic global-coefficient mixed subgrid-scale eddy-viscosity model for large-eddy simulation of turbulent flows in complex geometries is developed. In the present model, the subgrid-scale stress is decomposed into the modified Leonard stress, cross stress, and subgrid-scale Reynolds stress. The modified Leonard stress is explicitly computed assuming a scale similarity, while the cross stress and the subgrid-scale Reynolds stress are modeled using the global-coefficient eddy-viscosity model. The model coefficient is determined by a dynamic procedure based on the global-equilibrium between the subgrid-scale dissipation and the viscous dissipation. The new model relieves some of the difficulties associated with an eddy-viscosity closure, such as the nonalignment of the principal axes of the subgrid-scale stress tensor and the strain rate tensor and the anisotropy of turbulent flow fields, while, like other dynamic global-coefficient models, it does not require averaging or clipping of the model coefficient for numerical stabilization. The combination of the global-coefficient eddy-viscosity model and a scale-similarity model is demonstrated to produce improved predictions in a number of turbulent flow simulations. (c) 2013 Elsevier Inc. All rights reserved.
- Keywords
- Subgrid-scale model; Large-eddy simulation; Turbulence simulation; Global-coefficient model; Scale-similarity model; Navier-Stokes equations; NAVIER-STOKES EQUATIONS; COMPLEX GEOMETRIES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14620
- DOI
- 10.1016/J.IJHEATFLUIDFLOW.2013.02.008
- ISSN
- 0142-727X
- Article Type
- Article
- Citation
- INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, vol. 42, page. 94 - 104, 2013-08
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