Meeting Abstract

103-5  Sunday, Jan. 6 14:30 – 14:45  How Fish Power Swimming — a 3D Computational Fluid Dynamics Study MING, TY; SONG, JL; JIN, BW; LUO, HX; DU, RX; DING, Y*; Beijing Computational Science Research Center, Beijing, China; Beijing Computational Science Research Center, Beijing, China; Beijing Computational Science Research Center, Beijing, China; Department of Mechanical Engineering, Vanderbilt University, Nashville, TN, USA; Department of Mechanical and Automation Engineering, Chinese University of Hong Kong, Hong Kong SAR, China ; Beijing Computational Science Research Center, Beijing, China dingyang@csrc.ac.cn

In undulatory swimming of fish, muscles contract sequentially along the body to generate a bending wave that pushes against the water and produces thrust. Here, we use a 3D computational fluid dynamics model coupled to the motion of the fish with prescribed deformation to study the force, torque, and power distributions along the fish’s body. We find that forces on the bodies of both the anguilliform swimmer and the carangiform swimmer are dominated by reactive forces; furthermore, the force on the caudal fin of the carangiform swimmer is dominated by drag-like forces. The torque exhibits a wave pattern that travels faster than the curvature wave in both the anguilliform and carangiform swimmers, but the wave speed is higher for the carangiform swimmer. The power output for the anguilliform swimmer is concentrated on the anterior half of the body and is significantly negative on the posterior side of the body. In contrast, most of the power is generated by the posterior part of the body before the peduncle for the carangiform swimmer. The results explain the differences in the observed electromyography patterns in fish with different swimming modes and explain the tendon function in carangiform swimmers.