碩士 / 淡江大學 / 航空太空工程學系碩士班 / 101 / This research simulated the flow field induced by a swinging fish downstream of a circular cylinder. The power required for swimming was also deduced. Three cases each with different distance between cylinder and the fish were studied to find the power required for the propulsive motion.
The results showed that the power needed to overcome the drag force would be much smaller when fish tail swung up with the upstream vortex passed from the bottom and vice versa. The swimming power would be much smaller if the reverse vortex caused by fish tail undulation didn''t dissipated by the upstream vortex passing by. The total power consumption would increase otherwise.
It is found that the simulations for distance of 3L and 4L were similar since the minimum powers required in both cases were observed to occur at about 60 degrees to 120 degrees of phase difference. The highest power consumptions were around phase angle of 240 degrees to 300 degrees. To summarize the above results, while a swimming fish encountered various phases of vortices, phases of 60 degrees to 120 degrees would be better for a fish to save the swimming energy.
| Identifer | oai:union.ndltd.org:TW/101TKU05295003 |
| Date | January 2013 |
| Creators | Bing-Hao Wang, 王柄豪 |
| Contributors | Jing-Min Tang, 湯敬民 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 112 |
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