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ARTICLE

Simulation of C-Start and S-Start of Fishes by an ALE-GFD Method and a Curvature-Wave Backbone Model

Y. Zhao¹, K.S. Yeo¹, P. Yu¹, S.J. Ang¹

1 Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576

Structural Longevity 2010, 4(1), 31-38. https://doi.org/10.3970/sl.2010.004.031

Abstract

This paper presents the application of an Arbitrary Lagrangian Eulerian (ALE) and Singular Value Decomposition (SVD) based Generalized Finite Difference (GFD) method to simulate the C- and S-starts of a carangiform-type fish. The numerical model incorporate fluid-structure interaction (FSI) and computation is carried out on a hybrid grid comprising meshfree nodes around the undulating/deforming swimming fish and Cartesian nodes in the background. The meshfree nodes convect with the deformation and motion of the swimmer. A curvaturewave model of the backbone is used to generate the C- and S-start actions of the fish from the experimental data of Spierts and Leeuwen (1999). The curvature model provides a power tool to describe complex deformations of the fish backbone. The present study is probably the first to apply a curvature approach to reproduce the elegant and realistic manoeuvring kinematic actions of a carangiform-type fish.

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Keywords

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