Computational Fluid Dynamics Laboratory
DNS/LES of Homogeneous Turbulence
We have conducted 3D DNS and LES of homogeneous turbulence to explore new
SGS turbulence models. The code solves the incompressible Navier-Stokes equations
using a traditional Fourier pseudospectral method featuring dealiasing by either
the 3/2 rule or the phase shift rule. The code uses a unique parallel 3D FFT library
that has allowed for scaling on up to 16,000 processors of the IBM BG/L
at IBM's Watson's Laboratory. LES of the high-Reynolds number expermiental dataset
from Kang et al. (2003) has been conducted. The focus is on the use of
regularization based models and most recently the so-called t-model. Two
publications have appeard in the Journal of Turbulence and SIAM's Multiscale,
Modeling and Simulation (see paper list for exact reference). The code also
features various forcing strategies and scalar mixing to study SGS mixing models.
Below are baseline TKE results showing LES with Smagorinsky model compared to
the experimental data of Kang et al. (2003).
Below is sample from LES of Taylor-Green vortex. Scroll down for all images.