Alpha-modeling strategy for LES of turbulent mixing

Details Alpha-modeling strategy for LES of turbulent mixing Alpha-modeling strategy for LES of turbulent mixing

2002-02-05

arxiv.org/abs/nlin/0202012v1

Nonlinear Sciences

Chaotic Dynamics

42 pages, 14 figures, to appear in `Turbulent Flow Computation', edited by D. Drikakis, B.J. Geurts, Kluwer Academic Publisher

Scientific paper

The $\alpha$-modeling strategy is followed to derive a new subgrid parameterization of the turbulent stress tensor in large-eddy simulation (LES). The LES-$\alpha$ modeling yields an explicitly filtered subgrid parameterization which contains the filtered nonlinear gradient model as well as a model which represents `Leray-regularization'. The LES-$\alpha$ model is compared with similarity and eddy-viscosity models that also use the dynamic procedure. Numerical simulations of a turbulent mixing layer are performed using both a second order, and a fourth order accurate finite volume discretization. The Leray model emerges as the most accurate, robust and computationally efficient among the three LES-$\alpha$ subgrid parameterizations for the turbulent mixing layer. The evolution of the resolved kinetic energy is analyzed and the various subgrid-model contributions to it are identified. By comparing LES-$\alpha$ at different subgrid resolutions, an impression of finite volume discretization error dynamics is obtained.

Affiliated with

Also associated with

No associations

Rating

Alpha-modeling strategy for LES of turbulent mixing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Alpha-modeling strategy for LES of turbulent mixing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alpha-modeling strategy for LES of turbulent mixing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-705358