Overlaying mesh method for large deformation fluid-shell interaction analysis using interface-tracking ALE local mesh and immersed boundary global mesh

Abstract

In this paper, an arbitrary Lagrangian-Eulerian (ALE) overlaying mesh technique is proposed for the computational solution of fluid-shell interaction problems with large deformations and complex geometries. In the proposed method, a fluid-shell strongly-coupled analysis is carried out only within the local mesh domain including a deformable shell structure by an interface-tracking ALE method, while a global domain mesh is solved under the immersed boundary (IB) forces which are evaluated from the local mesh solutions of fluid-structure coupling forces on their interface. Therefore, two kinds of fluid-structure coupling computations are interactively carried out between local and global meshes. A falling paper and a flapping filament are simulated to demonstrate the superior performance of the proposed method.