Constrained large-eddy simulation of laminar-turbulent transition in compressible channel flow

Abstract

An improved constrained large-eddy simulations (CLES) for wall-bonded compressible transitional flows is proposed by introducing an intermittency factor. The improved model is tested and validated with a compressible channel flow that is transitioning from laminar to turbulent states. The improved model is compared against traditional dynamics Smagorinsky model (DSM) and Direct Numerical Simulations (DNS), where the improved model is in better agreement with DNS results than traditional DSM model, in terms of mean velocity profiles, total Reynolds stress and total heat flux. Therefore, the proposed method can be used to accurately predict the laminar-turbulent transition process of compressible wall-bounded flows.