Simulation of fish escape and swimming toward a predefined goal
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We present an immersed boundary method for numerical simulation of a swimming ﬁsh. The vorticity transport equation is solved on a Cartesian grid using compact ﬁnite dif- ferences. A Lagrangian structured grid deﬁnes the ﬁsh body and is moving in the surrounding incompressible ﬂow due to the exerted hydrodynamic forces and the torque. An eﬃcient law determining the curvature of a swimming ﬁsh is presented which is based on the geometrically exact theory of nonlinear beams and quaternions. Validation of the solver shows the eﬃciency and expected accuracy of the algorithm for swimming ﬁsh simulations. The structure of the wake of a swimming ﬁsh is studied, and some common features with the wake of a ﬂapping plate are demonstrated.
CitationGhaffari, S.-A. [et al.]. Simulation of fish escape and swimming toward a predefined goal. A: MARINE VII. "MARINE VII : proceedings of the VII International Conference on Computational Methods in Marine Engineering". CIMNE, 2017, p. 704-709. ISBN 978-84-946909-8-3.