CFD Seminar: A Consistent Hybrid LES/RANS Framework with High-Order LES Solver on Cartesian Mesh
Speaker: Heng Xiao
Biography: Dr. Heng Xiao is currently an Assistant Professor in the Department of Aerospace and Ocean Engineering at Virginia Tech. He received his Ph.D. in Civil Engineering from Princeton University in 2009. From 2009 to 2012 he worked as a post-doctoral researcher in ETH Zurich, Switzerland. His current research focuses on computational mechanics of fluids and particles in ocean engineering.
Abstract: n this talk we present a hybrid solver coupling a high-order LES solver with Cartesian mesh and a RANS solver with body-fitting mesh. The hybrid solver is developed within a dual-mesh, consistent hybrid framework, where LES and RANS simulations for the same flow are conducted simultaneously on different computational domains and different meshes. A relaxation approach is used to enforce the immersed boundary conditions in the LES. The flows over periodic hills at Reynolds numbers Re = 2800 and 10595 are simulated using the new solver. The adequacy of the boundary representation and forcing strategy is shown. The numerical studies also demonstrate the flexibility of the extended solver and the predictive capability of the new hybrid framework, which consists of two solvers operating on the same physical domain, but with non-conforming computational domains (i.e., a Cartesian mesh based LES solver combined with a body-fitting mesh based RANS solver). With the current framework, the potential of many existing academic codes for practical flow simulations, where complex geometries and wall resolution requirements represent major hurdles, can be explored.
Additional information, including the webcast link, can be found at the NIA CFD Seminar website, which is temporarily located at: