Large eddy simulation wall-modeling based on suboptimal control theory and linear stochastic estimation

Large eddy simulation wall-modeling based on suboptimal control theory and linear stochastic estimation

Stochastic Coherent Adaptive Large Eddy Simulation Method

In this paper we propose a novel approach called the stochastic coherent adaptive large eddy simulation ~SCALES! method which takes advantage of both the coherent vortex simulation ~CVS! and large eddy simulation ~LES! methods. With the SCALES method a wavelet filter is applied to a turbulent field such that the maximum number of modes are resolved in the simulation, given the balance between c...

Large Eddy Simulation and Turbulence Control

This paper reviews LES methods, based on the dynamic subgrid-scale model, that greatly improve the efficiency of turbulence control simulations in the context of drag reduction for plane turbulent channel flow. We begin by performing simulations of opposition control at Reynolds numbers in the range Reτ = 100 to 590 which demonstrate a decrease in effectiveness of this control strategy with inc...

Inverse Modeling for Large-Eddy Simulation

Approximate higher order polynomial inversion of the top-hat filter is developed with which the turbulent stress tensor in Large-Eddy Simulation can be consistently represented using the filtered field. Generalized (mixed) similarity models are proposed which improved the agreement with the kinetic energy transfer to small scales. These similarity models are analyzed for random periodic signals...

Compressible Large-Eddy Simulation of Separation Control on a Wall-Mounted Hump

Compressible large-eddy simulations of turbulent flow over a wall-mounted hump with active flow control are performedand comparedwithprevious experiments. Theflow is characterizedby the unsteady separationbefore the steep trailing edge, which naturally reattaches downstream of the hump to form an unsteady turbulent separation bubble. The lowMachnumber large-eddy simulation demonstrated a goodpr...