Stochastic coherent adaptive LES of forced isotropic turbulence

The stochastic coherent adaptive large eddy simulation (SCALES) method [1] exploits a wavelet thresholding filter-based dynamic grid adaptation strategy to solve for the energetic “coherent” eddies in a turbulent flow field. The effect of the residual less energetic flow structures is modeled by supplying the simulation with a suitable subgrid-scale (SGS) model. The SCALES approach was successfully applied to the simulation of decaying homogeneous turbulence (e.g. see [2, 3]). Here, the wavelet-based approach is applied to statistically steady turbulence by considering linearly forced homogeneous turbulence at moderate Reynolds-number. Due to the adaptive nature of the present approach, it is preferable to introduce forcing directly in physical space. For this reason, we adopt the linear forcing scheme proposed by Lundgren [4] and extensively studied by Rosales and Meneveau [5]. The continuity and Navier-Stokes equations for incompressible flow can be written in the forced case as