Application of a parallel solver to the LES modelling of turbulent buoyant flows with heat transfer
Küçük Resim Yok
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Inderscience Enterprises Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
An existing fully implicit, non-dissipative direct numerical simulation (DNS) algorithm is reformulated to utilise the sub-grid scale (SGS) models in large eddy simulation (LES). The Favre-filtered equations with low-Mach number scaling are derived. The wall-adapting local eddy-viscosity (WALE) is used as SGS model. A fully parallel, finite volume solver is developed based on the resulting LES algorithm using PETSc library and applied to buoyancy-and thermally-driven transitional/turbulent flows in Rayleigh-Taylor instability and turbulent Rayleigh-Benard convection. Results verify that the proposed low-Mach number LES approach, which is physically more accurate than pure incompressible methods for flows with variable properties, perfectly captures the evolution and complex physics of turbulent buoyant flows with or without heat transfer by taking the effects of density and viscosity changes into account without the Oberbeck-Boussinesq (OB) assumption even at large temperature differences with uniform accuracy and efficiency.
Açıklama
Anahtar Kelimeler
Large Eddy Simulation, Les, Low-Mach, Variable-Density, Wall-Adapting Local Eddy-Viscosity, Wale, Rayleigh-Benard Convection, Rbc, Rayleigh-Taylor İnstability, Rtı, Rayleigh-Taylor Instability, Direct Numerical-Simulation, Large-Eddy Simulation, Benard Convection, Thermal-Convection, Resolution, Algorithm, Transition, Dns
Kaynak
Progress in Computational Fluid Dynamics
WoS Q Değeri
Q4
Scopus Q Değeri
Q4
Cilt
18
Sayı
2
