Large eddy simulation (LES) of forced, homogeneous, isotropic, two-dimensional (2D) turbulence in the energy transfer subrange is the subject of this paper. A difficulty specific to this LES and its subgrid scale (SGS) representation is in that the energy source resides in high wave number modes excluded in simulations. Therefore, the SGS scheme in this case should assume the function of the en...

The predictions of resolvent analysis with and without eddy viscosity are evaluated for a friction Reynolds number 550. low-rank behavior the standard identifies energetic regions flow whereas is low rank when resulting projection leading mode onto from spectral proper orthogonal decomposition maximum. energy dissipation transport that introduced by examined to explain success or failure resolv...

The original (delayed) detached-eddy simulation ((D)DES), a widely used and efficient hybrid turbulence method, is confronted with some flaws containing grid-induced separation (GIS), log-layer mismatch (LLM), slow RANS-LES transition. A novel model, namely production-limited eddy (PLES), depleting the production through introducing subarid-scale viscosity proposed. data of zero-pressure gradie...

The flow in rivers is turbulent. main parameter related to turbulence the eddy viscosity, which used model a turbulent and involved determination of both velocities sediment concentrations. A well-known largely vertical distribution viscosity free surface flows (open channels rivers) given by parabolic profile that based on logarithmic velocity assumption valid therefore only log-law layer. It ...