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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/88073

    Title: 流場圓柱後方渦旋與魚擺動相位之流場特性研究
    Other Titles: The effect of phase on flow characteristics of swimming fish behind a circular cylinder
    Authors: 王柄豪;Wang, Bing-Hao
    Contributors: 淡江大學航空太空工程學系碩士班
    湯敬民;Tang, Jing-Min
    Keywords: 數值模擬;圓柱;渦旋;魚類擺動;相位;circular cylinder;vortex;fish;Phase
    Date: 2013
    Issue Date: 2013-04-13 11:59:30 (UTC+8)
    Abstract: 魚類在水中與流場之間的互動,一直受到科學家們的注意,有相當多的研究指出,魚類能利用水流產生的渦旋來減少自身在推進時能量的耗損,達到節能的效果,進而提升自己的推進效率,因此,魚類在行進時與如何與渦流作用,是一個非常重要的研究課題。
    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.
    Appears in Collections:[航空太空工程學系暨研究所] 學位論文

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