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| Study on the free swimming mechanical characteristics of juvenile grass fishes based on vorticity analysis |
| Received:March 02, 2021 Revised:July 23, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20210302003 |
| KeyWord:group swimming numerical simulation wake structure Propulsion efficiency |
| Author | Institution |
| 龙泽宇 |
三峡大学 水利与环境学院, 宜昌 |
| 胡晓 |
三峡大学 水利与环境学院, 宜昌 |
| 张永年 |
三峡大学 水利与环境学院, 宜昌 |
| 张奔 |
三峡大学 水利与环境学院, 宜昌 |
| 杨国党 |
三峡大学 水利与环境学院, 宜昌 |
| 石小涛 |
三峡大学 水利与环境学院, 宜昌 |
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| Abstract: |
| In order to explore the impact of the difference in body length between the upstream and downstream fish on the efficiency of the fish school,the vorticity and propulsion efficiency of the fish body under the stable swimming state of the juvenile fish school are analyzed in this paper is based on the Fluent dynamic grid technology.A numerical simulation is carried out.The calculation results show that the propulsion efficiency of shoal juveniles can be increased by up to 5% compared with single-tailed fish.When the body length of the upstream fish is greater than the body length of the downstream fish ΔL>0 cm,the difference of body length increases with the increase of the fish wake structure (d/D) increases,the overall propulsion efficiency decreases;when the upstream fish body length is smaller than the downstream fish body length ΔL<0 cm,the fish school wake structure (d/D) and overall propulsion efficiency decrease with the increase of the body length difference.When the body length difference between the upstream and downstream juveniles is ΔL=0.5 cm,the overall thrust coefficient and power coefficient of the triangle combination can reach 5.11×10-3 and 1.71×10-3,respectively.The overall propulsion efficiency under this combination can reach 17.2%. |
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