Wall-model integrated computational framework for large-eddy simulations of wall-bounded flows

A new eddy-based model for wall-bounded turbulent flows

Wall-layer Models for Large-eddy Simulations

■ Abstract Because the cost of large-eddy simulations (LES) of wall-bounded flows that resolve all the important eddies depends strongly on the Reynolds number, methods to bypass the wall layer are required to perform high-Reynolds-number LES at a reasonable cost. In this paper the available methodologies are reviewed, and their ranges of applicability are highlighted. Various unresolved issues...

Shear-improved Smagorinsky model for large-eddy simulation of wall-bounded turbulent flows

A shear-improved Smagorinsky model is introduced based on recent results concerning shear effects in wall-bounded turbulence by Toschi et al. (2000). The Smagorinsky eddyviscosity is modified as νT = (Cs∆) (|S|−|〈S〉|): the magnitude of the mean shear |〈S〉| is subtracted to the magnitude of the instantaneous resolved strain-rate tensor |S|; here CS is the standard Smagorinsky constant and ∆ deno...

A parametrized non-equilibrium wall-model for large-eddy simulations

Wall-models are essential for enabling large-eddy simulations of realistic problems at high Reynolds numbers. The present study is focused on approaches that directly model the wall shear stress, specifically on filling the gap between models based on wall-normal ordinary differential equations (ODEs) that assume equilibrium and models based on full partial differential equations that do not. W...

Application of parallel algebraic multilevel domain decomposition preconditioners in large eddy simulations of wall-bounded turbulent flows: first experiments

In this work we analyze the behaviour of multilevel Domain Decomposition preconditioners, coupled with Krylov solvers, in the solution of linear systems arising in the application of a projection-based method to the numerical simulation of uncompressible wall-bounded turbulent flows. We consider a Large Eddy Simulation (LES) approach, where a high-order filter is applied to the Navier-Stokes eq...