Numerical study of propulsion performance in swimming fish using boundary element method

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• 作者：Saeed Najafi ; Madjid Abbaspour
• 关键词：Fish ; like swimming ; Propulsion performance ; Boundary element method ; Wake sheet modeling
• 刊名：Journal of the Brazilian Society of Mechanical Sciences and Engineering
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：39
• 期：2
• 页码：443-455
• 全文大小：
• 刊物主题：Mechanical Engineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1806-3691
• 卷排序：39

文摘

In this paper, hydrodynamic simulation of fish-like swimming for two types of aquatic animals including tuna fish and giant danio is presented. We employ an unsteady three-dimensional inviscid boundary element method including time stepping algorithm to capture the wake sheet and flow features around swimming fish in a straight course. At each time step, an unsteady Bernoulli equation was used to find the pressure distribution and thrust generated by the animal. To couple fluid solver with kinematic equations of flexible body, undulating motions of backbone were defined using a prescribed continuous function. Although the flexible motion mechanism controls the fish swimming but no structural model has been considered for the body, there is no fluid–solid interaction. To validate the model, we compare our results with the numerical work of Zhu et al. [1] and experimental results of Barrett et al. [2] and show that this methodology could be fast and reliable approach for the prediction of flexible propulsors.