A physical-space version of the stretched-vortex subgrid-stress model for large-eddy simulation

A physical-space version of the stretched-vortex subgrid-stress model is pr esented and applied to large-eddy simulations of incompressible flows. This version estimates the subgrid-kinetic energy required for evaluation of th e subgrid-stress tensor using local second-order structure-function informa tion of the resolved velocity field at separations of order the local cell size. A relation between the structure function and the energy spectrum is derived using the kinematic assumptions of the stretched-vortex model for l ocally homogeneous anisotropic turbulence. Results of large-eddy simulation s using this model are compared to experimental and direct numerical simula tion data. Comparisons are shown for the decay of kinetic energy and energy spectra of decaying isotropic turbulence and for mean velocities, root-mea n-square velocity fluctuations and turbulence-kinetic energy balances of ch annel flow at three different Reynolds numbers. (C) 2000 American Institute of Physics. [S1070-6631(00)00207-5].