Improved Delayed Detached Eddy Simulation with Reynolds-stress background modeling

A novel variant of Improved Delayed Detached-Eddy Simulation based on a differential Reynolds-stress background model is presented. The approach aims to combine the advantages anisotropy-resolving closures in modelled RANS regions with consistent LES and wall-modelled behaviour resolved flow regions. In computations decaying isotropic turbulence low-dissipative solver it shown that straightforward hybridised provides insufficient turbulent dissipation as sub-grid closure therefore locally replaced by scalar viscosity modelling. Simulations periodic channel flows at different Reynolds numbers grid resolutions are used calibrate validate branch new model. final application embedded flat-plate boundary layer widely results using SST-RANS model, but shows some deviations from Coles-Fernholz skin-friction correlation. this regard, initial sensitivity studies indicate possible adverse effects due synthetic-turbulence these simulations.