Flow around a flexible plate in a free stream

Abstract

This paper presents a numerical scheme for fluid-structure interaction, especially for flexible structures. The lattice Boltzmann method with an immersed boundary technique using a direct forcing scheme is used for the fluid , and a finite element method with Euler beam elements is used for the flexible plate. The direct forcing scheme of the lattice Boltzmann method was improved for the immersed boundary scheme by introducing the occupation ratio of fluid lattices among the interpolated lattices. We compared the results of our proposed scheme with the known results of conventional schemes. Using the proposed numerical scheme, the flow around the flexible plate in a free stream is simulated for the effect of flexibility. Our results show that the major role of the flexibility of the flexible plate is the reduction of the resistance from flow. From the unsteady flow around a flexible plate, we found that the St of the flexible plate up to < 80 Re increased regardless of plate flexibility, but the St in the range of > 120 Re was dependent on plate flexibility. In the range of > 120 Re , the St of very flexible plate increased with increasing , Re while the St of rigid plate decreased with increasing Re .

Two-Dimensional Simulation to Investigate the Interaction of Fluid - Structure Inside A Microchannel with Elastic and Rigid Boundary

“…Wu and Shu [5] proposed a new version of IIM, which could well consider the effect of external force on the momentum flux as well as the discrete lattice effect. JiSeok and SangHwan [6] presented a numerical scheme for fluid-structure interaction, especially for elastic structures. They employed a hybrid IIM using an improved direct forcing scheme for the fluid, and a finite element method with Euler beam elements for the elastic plate.…”