A subgrid-scale eddy-viscosity model based on the volumetric strain-stretching

作者：Ryu Sungmin^*; Iaccarino Gianluca

来源：Physics of Fluids, 2014, 26(6): 065107.

DOI：10.1063/1.4882880

We propose a novel subgrid-scale (SGS) eddy-viscosity model for large eddy simulation (LES) to accurately reproduce the effect of subgrid stresses on the resolved scales. The developed SGS model is based on the second-order volumetric strain-stretching (VSS) tensor, which is constructed by the multiplication of diagonal components of the strain-rate tensor with its off-diagonal components. The proposed VSS-model is validated in typical flow cases: freely decaying isotropic turbulence, incompressible turbulent channel flow at Re-tau = 395, compressible turbulent channel flows at Ma = 1.5 and Re-tau = 221, and Ma = 3.0 and Re-tau = 556. LESs with the dynamic Smagorinsky model and the Vreman model are also performed to compare the performance of the VSS-model. The proposed model correctly recovers cubic wall behavior in the vicinity of solid boundaries in incompressible flow regime, and it has no limitation in its application to geometrically complex flows.

• 出版日期2014-6