Berkeley Fluids Seminar

University of California, Berkeley

Bring your lunch and enjoy learning about fluids!

Friday, September 9, 2016

3110, Etcheverry Hall, 12:00-13:00

Prof. Chunlei Liang (The George Washington University)


A Novel High-order Sliding and Deforming Spectral Difference Method for Exascale Simulations of Turbulent Flows with Wind Turbines


Abstract: I will present a novel high-order sliding and deforming spectral difference (SD^2) method for solving compressible Navier-Stokes equations on unstructured quadrilateral grids. The SD^2 method is an extension of the sliding-mesh spectral difference method (Zhang & Liang, 2015, J. Computational Physics) to coupled rotating and deforming domains. Through a simple sliding-mesh interface, the SD^2 method mitigates large grid distortion which is often resulted from rotating wall boundaries. Meanwhile, the SD^2 algorithm adopts an arbitrary Lagrangian-Eulerian framework that can handle large-amplitude translational motions of grid points on deforming domains. This new SD^2 solver is verified by using several benchmark flow problems able to demonstrate optimal orders of accuracy in space. Simulations results for a vertical axis wind turbine and a system of two oscillating wings in tandem will be presented. The SD^2 method is efficient and robust for all our test problems and is expected to be a competitive algorithm for simulating turbulent flows of wind turbines by using exascale computers in the near future.

Biography: Chunlei Liang is an associate professor of engineering and applied science at the George Washington University. He obtained his PhD degree from the University of London in 2005. He received an Office of Naval Research (ONR) Young Investigator Program Award in 2014 and an NSF CAREER award in 2016. He is an editorial board member of Computers & Fluids, an Elsevier journal and an Associate Fellow of the AIAA.




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