Hybrid LES/RANS Simulation of the Effects of Boundary Layer Control Devices Using Immersed Boundary Methods

摘要

This work has developed an extension of an existing immersed-boundary (IB) method to compressible, turbulent flows and has investigated its use in simulating the effects of different types of flow control devices: micro vortex generators, bleed-hole arrays, aeroelastically- deforming mesoflaps, and boundary layer trips. The IB method has been used with Reynolds-averaged Navier-Stokes (Menter SST) and hybrid large-eddy simulation- Reynolds-averaged Navier-Stokes (LES/RANS) turbulence closures. The method has been applied to oblique shock- turbulent boundary layer interactions with and without micro vortex-generator flow control (Cambridge University experiments), bleed flow control (NASA Glenn experiments), and aeroelastically-deforming mesoflap flow control (University of Illinois experiments). The results show that the IB approach can simulate the general effects of the control devices to a high degree of precision without requiring excessively fine meshes near the control element. The LES/RANS method is capable of accurately predicting mean-flow and second-moment statistics and can be used to provide insights into the effects of the control device in modulating the turbulent flow response.