Simulation of self-propelled anguilliform swimming by local domain-free discretization method
The local domain-free discretization method is extended in this work to simulate fluidstructure interaction problems, the class of which is exemplified by the self-propelled anguilliform swimming of deforming bodies in a fluid medium. Given the deformation of the fish body in its own reference frame, the translational and rotational motions of the body governed by Newton's Law are solved together with the surrounding flow field governed by NavierStokes equations. When the body is deforming and moving, no mesh regeneration is required in the computation. The loose coupling strategy is employed to simulate the fluidstructure interaction involved in the self-propelled swimming. The local domain-free discretization method and an efficient algorithm for classifying the Eulerian mesh points are described in brief. To validate the fluidstructure interaction solver, we simulate the lock-in phenomena associated with the vortex-induced vibrations of an elastically mounted cylinder. Finally, we demonstrate applications of the method to two-dimensional and three-dimensional anguilliform-swimming fish. The kinematics and dynamics associated with the center of mass are shown and the rotational movement is also presented via the angular position of the body axis. The wake structure is visualized in terms of vorticity contours. All the obtained numerical results show good agreement with available data in the literature. Copyright (c) 2011 John Wiley & Sons, Ltd.
anguilliform swimming domain-free discretization fluid-structure interaction immersed boundary method self-propulsion nonboundary-conforming method