Large-eddy simulation of a body-junction flow
- Wall-junction flows are common in engineering applications but corner flow physics near the junction is not well understood. Moreover, the performance of the subgridscale (SGS) models frequently used for large eddy simulation (LES) is not well characterized. For this reason we have focused on LES simulations of a wing-body junction experimentally studied by Devenport & Simpson (1990). First, we have performed LES with the Vreman model, and analyzed the simulation results with respect to three specific goals: compare the computed and measured turbulence statistics in the junction region, investigate the corner vortex dynamics, and characterize why the SGS model shows inaccurate predictions near the corner. In order to improve the prediction ability of LES, we have developed two SGS models by focusing on two critical components: the mathematical operator that connects the resolved and subgrid stresses, and the determination of the model coefficient. The resulting models, volumetric strain-stretching based SGS eddy-viscosity model and residual stress based dynamic Vreman model are presented. The two SGS models are first validated in LES of two typical flows: decaying homogeneous isotropic turbulence and turbulent channel flows in compressible and incompressible regimes. Based on the improved wall-behavior of the proposed SGS models, we carried out additional LES of the wing-body junction case.
|Type of resource
|electronic; electronic resource; remote
|1 online resource.
|Stanford University, Department of Mechanical Engineering.
|Statement of responsibility
|Submitted to the Department of Mechanical Engineering.
|Thesis (Ph.D.)--Stanford University, 2014.
- © 2014 by Sungmin Ryu
Also listed in
Loading usage metrics...