Influence of Turbulent Inlet Boundary Condition on Large Eddy Simulation Over a Flat Plate Boundary Layer

Abstract

There are different methods for setting the inlet boundary condition (IBC) in large eddy simulation (LES). However, different methods applied in the same simulation result in different results. In this study, the influence of setting the IBC in the LES with the Lund method, the divergence-free synthetic eddies method (DFSEM), and the digital filter method (DFM) on the simulation of the boundary layer over a flat plate was investigated. For the DFM and the DFSEM, the input parameters such as the turbulent length scales with constant values were tested. The results indicated that simulations based on the DFSEM and the DFM with turbulent length scales equal to the boundary layer thickness by a factor of 0.6 were in good agreement with the direct numerical simulation (DNS) results It can be observed that the simulation results of the DFSEM agree better with the DNS data than the other two methods.