期刊
COMPUTERS & FLUIDS
卷 124, 期 -, 页码 1-11出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compfluid.2015.10.006
关键词
Fish swimming; Vorticity structures; Space-time finite element method; Mother-calf pair of fish; Reverse Karman street
资金
- UNSW's Early Career Researcher Grants Scheme
- Australian Research Council's Discovery Project Funding Scheme [DP130103850]
- Australian Government
Flow around two foils of different sizes is investigated by solving the incompressible Navier-Stokes equations numerically with a space-time finite element method to study the swimming performance and vorticity structures of a mother-calf pair of fish. Based on simulations over a wide range of the relative position, Reynolds number, phase difference and phase velocity between the foils, we discuss in detail the drag coefficient, hydrodynamic power, root-mean-square value of the lift, and voracity structures. It is found that both the mother and calf fish benefit in tandem and staggered arrangements. By changing their phase difference and phase velocity, the fish can get better performance in terms of thrust increase and hydrodynamic power saving. The mechanism of these strategies which are used to improve the performance is enhancing a reverse Karman street or diminishing a Karman street. (C) 2015 Elsevier Ltd. All rights reserved.
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