Prof.Liangyu Zhao

School of Aerospace Engineering, Beijing Institute of Technology,

Beijing 100081, P. R. China

Bio

Liangyu Zhao is a Professor of the School of Aerospace Engineering, Beijing Institute of Technology, Beijing, P. R. China. He received his Bachelor and Doctoral Degrees both from Beijing Institute of Technology in 2003 and 2008. He was a Visiting Scholar at University of Cambridge, and a Postdoctoral Fellow at Hanyang University. His work focuses on Flight Vehicle Design, Navigation Guidance and Control, System Integration and Simulation, and Computional Aerodynamics. He has published more than 80 papers in journals and conferences. He has won two First Prizes in National Defense Science and Technology Progress Award. He is an editorial board member of several journals. He is one of the founders and co-chair of the International Symposium on Thermal-Fluid Dynamics (ISTFD) series since 2019.

Title

Implementation and application of a generalized wall model

Abstract

A generalized wall stress function that introduces the non-equilibrium effect in turbulent flow is applied to performing high Reynolds number large-eddy simulations (LES) of wall bounded flow in the presence of favorable and adverse pressure gradients. The corrected velocity with pressure gradient contribution is used to calculate the wall stress. The model applies to the entire viscous layer, buffer layer and inertial region. In this work, a few examples of complex turbulent flows are presented to show the performance of the generalized wall function. Flow over periodic hill and flow over a cylinder are simulated with the present model. The results show that it is able to accurately predict the main character of flow filed in both cases.