Abstract
We study subgrid-scale modeling for large-eddy simulation of anisotropic turbulent flows on anisotropic grids.
In particular, we show how the addition of a velocity-gradient-based nonlinear model term to an eddy viscosity model provides a better representation of energy transfer.
This is shown to lead to improved predictions of rotating and nonrotating homogeneous isotropic turbulence.
%We furthermore show that spanwise-rotating turbulent plane-channel flows form a challenging test case for large-eddy simulation.
Our research further focuses on calculation of the subgrid characteristic length, a key element for any eddy viscosity model.
In the current work, we propose a new formulation of this quantity based on a Taylor series expansion of the subgrid stress tensor in the computational space.
Numerical tests of decaying homogeneous isotropic turbulence and a plane-channel flow illustrate the robustness of this flow-dependent characteristic length scale with respect to mesh anisotropy.
In particular, we show how the addition of a velocity-gradient-based nonlinear model term to an eddy viscosity model provides a better representation of energy transfer.
This is shown to lead to improved predictions of rotating and nonrotating homogeneous isotropic turbulence.
%We furthermore show that spanwise-rotating turbulent plane-channel flows form a challenging test case for large-eddy simulation.
Our research further focuses on calculation of the subgrid characteristic length, a key element for any eddy viscosity model.
In the current work, we propose a new formulation of this quantity based on a Taylor series expansion of the subgrid stress tensor in the computational space.
Numerical tests of decaying homogeneous isotropic turbulence and a plane-channel flow illustrate the robustness of this flow-dependent characteristic length scale with respect to mesh anisotropy.
| Original language | English |
|---|---|
| Title of host publication | Studying Turbulence Using Numerical Simulation Databases - XVI |
| Subtitle of host publication | Proceedings of the 2016 Summer Program |
| Editors | Parviz Moin, Javier Urzay |
| Publisher | Center for Turbulence Research, Stanford University |
| Pages | 265-274 |
| Number of pages | 10 |
| Publication status | Published - Dec-2016 |