11320E500100 Seminar

TOPIC
▸　Modeling Vortex Shedding Using Discrete Vortex Method 

❝　The rising interest in the engineering applications of bio-inspired fluid dynamics, such as insect and bird flight and nonstationary aerodynamics, has become a major research topic for scientists and engineers. Its fundamental characteristic is the coupling between flow field dynamics and the unsteady motion of the body, forming a dynamic system. At the wing's leading edge, a leading-edge vortex (LEV) is formed, which grows, detaches, and interacts with the surrounding flow field as the wing moves. This vortex is closely related to the lift force and wake patterns. We conduct a numerical study on a flat plate immersed in a steady flow, examining its aerodynamic characteristics under a fixed angle of attack and a sinusoidal flapping motion. We use the discrete vortex method (DVM) for modeling this problem. Traditional CFD methods, based on Eulerian grids, typically incur high computational costs and long processing times for such unsteady problems. In contrast, the discrete vortex method is a simplified model based on a Lagrangian perspective. It is particularly suitable for vortex-dominated flow phenomena, such as large-scale flow separation or vortex shedding. Although the vortex method is inviscid, it captures key interactions of the leading-edge and trailing-edge vortices. We also use computational fluid dynamics (CFD) of the finite volume method to solve the two-dimensional Navier–Stokes equations. We simulate lateral translation and pitching motion in a sinusoidal waveform while introducing a phase difference between these motions. We explore the transition conditions from drag-dominated to thrust-dominated regimes under different motion frequencies and phase angles. Finally, we compare and discuss the results obtained from the vortex method with those from CFD.　❞

SPEAKER
▸　Prof. Ching CHANG
▸　Department of Power Mechanical Engineering, National Tsing Hua University

TIME
▸　2025/04/29 (TUE) 13:20 ~ 15:10

VENUE
▸　Classroom 201, Engineergin Building 1