Predictions of Aero-Optical Distortions Using LES with Wall Modeling

摘要

Large-eddy simulation (LES) with wall-modeling is evaluated for applications to aero-optical predictions at practical Reynolds numbers. Turbulent boundary layers and flow over a cylindrical turret are considered. The results of boundary-layer flows at both subsonic and supersonic speeds show accurate predictions of mean velocity profiles and velocity fluctuations. The density fluctuations and hence wavefront distortions are found to be more demanding in terms of grid resolution. The subsonic separated shear layer over a cylindrical turret is computed at the same Reynolds number as in the experiment conducted by Gordeyev et al. Both flow and optical results show good agreement with the experimental measurements and the previous wall-resolved LES results of Wang et al. at a reduced Reynolds number.