Improved turbulence models based on large eddy simulation of homogeneous, incompressible turbulent flows

The physical bases of large eddy simulation and the Subgrid scale modeling it employs are studied and a scale-similarity model for the subgrid-scale turbulent Reynolds stresses was developed: ""Exact'' tests of this model based on results of full simulations of homogeneous turbulent flows show that it correlates well with the subgrid-scale Reynolds stresses but does not correlate well with eddy viscosity models. A ""defiltering'' method for large eddy simulation was also developed which can predict accurately the full turbulent kinetic energy from the properties of large eddies. The effects of system rotation on isotropic turbulence, large eddy simulations of homogeneous shear flows and large eddy simulations of homogeneous shear flows with system rotaton are discussed.