Temperature perturbation method to generate turbulent inflow conditions for LES/DNS simulations

An alternative approach to the classical velocity perturbations is applied to generate inflow turbulence for LES and DNS of wall bounded flows. The method consists in introducing random temperature perturbations that generate turbulence through local buoyancy effects. The cell perturbation method is implemented in the incompressible buoyant solver of OpenFOAM v2.3 ans tested on a plane channel flow at Rer = 395. The buoyancy force is locally increased within in active zone specifications and the governing Richardson number. Reynolds stresses are compared to reference results. The method appears to be simple and efficient, while only first-order statistics are required as input.