Beijing Computational Science Research Center

Professor Ching Yuen Loh

Abstract: Nozzle flows and their aeroacoustic noises are important to aerospace applications. I will present a number of examples of complex nozzle flows from low speed subsonic to supersonic region, including the transonic resonance, subsonic and supersonic mixing noise, jet screech noise, supersonic jet impinging on flat plate, unsteady convergent-divergent (C-D) nozzle flow. Computation of such flows posts a stringent challenge to the existing computational fluid dynamics (CFD) as these flows contain shocks, shock cells, vortices as well as weak acoustic waves. These flows are numerically studied using second order accurate (in space and time), low-dissipation finite volume (FV) schemes, either "centered" ("CE/SE": Conservation Element - Solution Element method) or "upwind" type. All the numerical results are compared to existing experimental data. The comparison demonstrates the accuracy and robustness of the numerical schemes we developed.

About the Speaker: Prof.Ching Yuen Loh obtained his PhD in applied mathematics from University of Western Ontario in 1986, and then he came to University of Waterloo as the Canadian NSERC postdoc fellow and visiting professor for the year 1986-1990, specializing in CFD (computational fluid dynamics). In 1990, he joined NASA Glenn Research Center in Cleveland, Ohio, USA and became U.S. NRC (National Research Council) fellow, working on Lagangian description of fluid dynamics. He was the senior research scientist at NASA Glenn Research Center between 1995 and 2010, working on CFD algorithm and application to aerospace application.

Date&Time: August 9, 2012 (Thursday), 15:00 – 16:00
Location: 606 Conference Room