碩士 / 淡江大學 / 航空太空工程學系碩士班 / 104 / This research simulated the characteristics of the flow field with an undulating fish behind a blunt body in three-dimension. A CFD software (ANSYS-FLUENT) was used to analyze the interaction of flow field induced by the vortex behind a blunt body and the vertical flow initiated by an undulating fish. Parameters included in this study were, the velocity of the fish swimming (0.4m / s), the distance between the blunt body and the fish (0.2m), the undulating period of swimming (0.45s). One sixth period of increment was used in analyzing the effect of various delay offset on the characteristics of the flow field and the variation of power required for swimming.
The results show that in six different starting undulating delays (0.000s, 0.075s, 0.150s, 0.225s, 0.300s, 0.375s) , the following four cases (0.075s, 0.225s, 0.300s, 0.375s) showed smaller swimming power required, while the other two (0.000s, 0.150s) needed higher swimming power. Results indicated that the first three cases exhibiting similar trend in pressure variations. However, the pressure variation of the case with delay of 0.075 was milder than the other two. Similar results were also observed in second group. It could be caused by the cancelling of vortex on one side of fish and the high pressure on the other side.
| Identifer | oai:union.ndltd.org:TW/104TKU05295002 |
| Date | January 2016 |
| Creators | Tien-Hsin Yu, 余恬欣 |
| 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 | 89 |
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