研究結果顯示，在 (0.000秒、0.075秒、0.150秒、0.225秒、0.300秒、0.375秒) 等六個不同之起始擺動時間點下， (0.075秒、0.225秒、0.300秒、0.375秒)等起始擺動時間點有較小之游動功率，而0.000秒及0.150秒等之起始擺動時間點有較大之游動功率。由壓力圖得知，前三個時間點(0.000s, 0.075s, 0.150s)之壓力分佈圖趨勢較為類似，但0.075秒之壓力數值較另外兩個時間點小了許多，反而與0.225秒、0.300秒、0.375秒之壓力數據較接近。其原因推測為魚隻前方渦漩與魚尾渦漩相互抵消，且魚隻擺動時高壓區位於擺動方向另一側。
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.