NATIONAL INSTITUTE OF AEROSPACE

10.17.16 Liu

10.17.16 Liu

Title:  79th NIA CFD Seminar: Implementation of Third-Order Edge-Based Scheme into FUN3D for Steady and Unsteady Flows, Part I: Third-order Inviscid and Second-order Hyperbolic Navier-Stokes Schemes

Date: Monday, October 17, 2016

Time: 11:00am-noon (EST)

Room: NIA, Rm137

Speaker: Yi Liu

Media Site Link:

http://nia-mediasite.nianet.org/NIAMediasite100/Play/a5b45fe5c96342e899df58b33cafba8d1d

Abstract: This talk is to present the implementation of third-order-inviscid implicit edge-based solvers for three-dimensional steady and unsteady flows on unstructured tetrahedral grids. Third-order edge-based scheme has been implemented into NASA’s FUN3D code for inviscid terms. Second-order edge-based hyperbolic Navier-Stokes schemes, which achieve third-order accuracy in the inviscid terms, have also been implemented. For sources terms coming from manufactured solutions or unsteady BDF time derivatives, a divergence form of the source term discretization scheme has also been implemented into FUN3D, where third-order accuracy can be achieved with source terms presented by unsteady flow. Some key improvements are reported for the hyperbolic Navier-Stokes schemes. Third-order accuracy is verified by the method of manufactured solutions for steady flows and by inviscid moving vortex for unsteady flows for unstructured tetrahedral grids. Developed schemes are compared for some representative test cases for three-dimensional inviscid and viscous flows.

Bio: Dr. Yi Liu graduated from Georgia Institute of Technology with a Ph.D degree in aerospace engineering in 2003. He also holds a M.E. from Beijing University of Aeronautics and Astronautics in Beijing, China. In 2004, he joined the National Institute of Aerospace after a one-year postdoctoral fellowship at Georgia Tech. He has previously served as a senior research engineer at NIA in the area of computational fluid dynamics (CFD) and multi-disciplinary analysis of rotorcraft configurations. He has conducted various research projects, including work in the areas of rotorcraft aerodynamic analysis and acoustic prediction; micro-air vehicle and flapping wing aerodynamics sponsored by ARL and NASA. Currently, he is conducting the research project of implementation of third-order edge-based scheme in NASA CFD solver FUN3D with collaboration of researchers at NASA LaRC-Computational AeroSciences Branch.

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