Turbulent Inflow Generation for Large-Eddy Simulation of Incompressible Flows Through Buoyancy Perturbations

Turbulent inflow generation techniques for large-eddy simulation (LES) of turbulent boundary layers is an active area of research. Here, we investigate the use of the perturbation-box turbulent-inflow technique that feeds colored-noise perturbations to the velocity field through the Boussinesq buoyancy approximation. We use a bulk Richardson number based on the perturbation box height and the incoming mean velocity profile to estimate the amplitude of white noise added to the temperature channel flow at Rer = 395 and show good agreement with direct numerical simulation benchmarks. We also demonstrate the applicability of the method to the backward-facing step case