Abstract: Immersed-boundary (IB) methods typically discretize the governing equations on a Cartesian grid, and generally do not require that the geometry of the boundary conform in any way to this Cartesian grid. Therefore, the IB methods suit the computational needs for studying moving and/or morphing objects in fluid flow. An improved method is employed, which uses direct forcing to distinguish feedback forcing, along with discussions of direct-forcing interpolation/extrapolation, resolution requirement, and accuracy of the solution. The results are focused on the flow physics of a multi-parameter dynamic system and vortex dynamic mechanisms of wakes behind flapping foils.

About the Speaker: Dr. Zhongquan (Charlie) Zheng is currently Professor and Graduate Program Director in Aerospace Engineering Department at University of Kansas, Fellow of ASME, and Associate Fellow of AIAA. He received his B.S. and M.S. degrees, both from Department of Engineering Mechanics at Shanghai Jiao Tong University in 1984 and 1987, respectively, and his Ph.D. degree in 1993 from Department of Mechanical Engineering and Mechanics, Old Dominion University. He has been a member of numerous TCs in ASME and AIAA. He was Vice Chair and then Chair of ASME CFD TC, Chair of ASME Aero/Hydro-acoustics TC, and Executive Member of ASME Division of Noise Control and Acoustics. He is an Associate Editor of Journal of Fluids Engineering.