A novel buoyancy-modified subgrid-scale model for large-eddy simulation of turbulent convection
Küçük Resim Yok
Tarih
2021
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Emerald Group Publishing Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Purpose - The purpose of this paper is to develop a subgrid-scale (SGS) model for large eddy simulation (LES) of buoyancy- and thermally driven transitional and turbulent flows and further examine its performance. Design/methodology/approach - Favre-filtered, non-dimensional LES equations are solved using non-dissipative, fully implicit, kinetic energy conserving, finite-volume algorithm which uses an iterative predictor-corrector approach based on pressure correction. Also, to develop a new SGS model which accounts for buoyancy, turbulent generation term in SGS viscosity is properly modified and enhanced by buoyancy production. Findings - The proposed model has been successfully applied to turbulent Rayleigh-Benard convection. The results show that the model is able to reproduce the complex physics of turbulent thermal convection. In comparison with the original wall-adapting local eddy-viscosity (WALE) and buoyancy-modified (BM) Smagorinsky models, turbulent diagnostics predicted by the new model are in better agreement with direct numerical simulation. Originality/value - A BM variant of the WALE SGS model is newly developed and analyzed.
Açıklama
Anahtar Kelimeler
Large Eddy Simulation, Rayleigh-Benard Convection, Buoyancy-Modified, Subgrid-Scale Model, Wall-Adapting Local Eddy-Viscosity Model, Rayleigh-Benard Convection, Numerical-Simulation, Stress, Les, Flow
Kaynak
International Journal of Numerical Methods for Heat & Fluid Flow
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
31
Sayı
8
