On the generation of turbulent inflow for hybrid RANS/LES jet flow simulations

The present work is devoted to the assessment of a low-noise turbulence generation methodology used produce boundary layer with three-dimensional resolved at exit jet nozzle reproduce experimental conditions. method relies on use roughness elements introduced in computational domain Immersed Boundary Conditions and ZDES mode 3 (Wall Modelled LES branch ZDES). simulation round M = 0.9 Reynold number 106 compared no using 2. behaviour downstream inside scrutinized two grids. combined produces satisfying levels exit. early stages shear development are modified by simulations providing an initially turbulent layer. On other hand, 2 simulations, mean velocity profile but turbulence, display short area strong instabilities leading quick mixing results give insights level modelling needed depending purposes flow considered.