Computational analysis of fluid-structure interaction in case of fish swimming in the vortex street
作者机构：College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha410073China Unmanned Systems Research CenterNational Innovation Institute of Defense TechnologyBeijing100071China China Aerodynamics Research and Development CenterState Key Laboratory of AerodynamicsMianyang621000China Hypervelocity Aerodynamics InstituteChina Aerodynamics Research and Development CenterMianyang621000China
出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)
年 卷 期：2021年第33卷第4期
页 面：747-762页
核心收录：
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
基 金：Project supported by the National Key Research and Development Program of China (Grant No.2016YFB0200701) the National Natural Science Foundation of China (Grant Nos.11532016, 11672324) the National Key Project (Grant No.GJXM92579)
主 题：Computational analysis fluid-structure interaction(FSI) Kármán gait vortex street passive locomotion fish swimming
摘 要：The fluid-structure interaction (FSI) in case of fish swimming in the vortex street is investigated by numerical simulations. The vortex street is generated by a D-section cylinder. A 2-D fish model is placed on the downstream centerline of the bluff cylinder at a distance of 4 diameters away from the center of the cylinder. To simulate the fish body undulation and movement, the moving mesh is generated by a coupling approach based on the radial basis function and the overset grid technology. The Navier-Stokes equation in the arbitrary Lagrangian-Eulerian form is solved by coupling with the kinematics equation. Three cases are investigated: in a stationary position without deformation, a passive locomotion without deformation, and an active deformation based on the Kármán gait model. The results indicate that the fish body is acted by an alternating force and moment when it is located in the centerline of the vortex street. Furthermore, the fish could extract sufficient kinetic energy to overcome the drag under suitable conditions even when it keeps rigid and out of the suction zone. When the fish body undulates based on the Kármán gait model, the interaction is evidently shown between the fish body and the vortices. The theoretical analysis demonstrates that the lateral force and the moment acting on the fish body vary in a cosine formula, with the lateral translation and the body rotation as a result. This study focuses on the behavior of the fish body in the bluff cylinder wake and reproduces some phenomena observed in the experiments. Besides, the Kármán gait model is also theoretically analyzed, for the further exploration of the FSI mechanism in case of fish swimming.
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