A well-known challenge for large eddy simulation (LES) is to provide a smooth transition from molecular to turbulent transport near the wall without having to explicitly resolve the viscous sublayer. We propose a simple but efficient approach based on modeling of wall shear stress and heat flux that enables accurate prediction of Nusselt number correlations for equilibrium boundary layers. The wall shear stress is treated directly with the Werner and Wengle (1991) power law model and the wall heat flux is modeled analogously with the Kader (1981) empirical correlation. Using these wall models, we perform simulations of turbulent convective heat transfer in a channel for various Prandtl numbers. The results show good agreement with the available experimental and numerical data.
Pub Type: Talks
Convective Heat Transfer, Large-Eddy Simulation, Near-Wall Modeling, Turbulent Boundary Layers