Numerical Simulation on Fluid-Structure Interaction using the Hybrid Cartesian/Immersed Boundary Method

摘要

The hybrid Cartesian/immersed boundary method is applied to fluid-structure interaction. The immersed boundary nodes are distributed based on edges crossing the boundary. Velocity is reconstructed at an immersed boundary node by the interpolation along a local normal line to the boundary. The hybrid staggered/non-staggered grid method is used to remove the pressure reconstruction near the boundary. The thin-plate mechanics is adapted to model dynamic elastic deformation due to the fluid load. The developed code is validated through comparisons with other results on the flow around two cylinders moving with respect to each other and the free rotation of a foil due to an incoming viscous flow. The code is applied to simulate the free roll decay of a submerged cylinder with thin, appendages. The effects of flexibility on the hovering force and the thrust acting on a moving flexible foil are simulated. Finally, the code is applied to simulate the flow fields around a three-dimensional blade which undergoes the rotation with periodic deformation.