The previous researches on hydrodynamics in aquaculture tanks are mainly on the basis of empty tanks, but the movement of fish group has a significant impact on the hydrodynamics in the tank. In this study, a numerical model coupling the fish group and flow field in the tank was established based on computational fluid dynamics (CFD), simulating the fluctuation motion of fish group in the circular tank and square arc angle tank. The accuracy of this numerical simulation method was verified through a physical model experimental system. The hydrodynamics in two fish-free tanks (control group) and 14 cases under the influence of fish groups with different tail beat frequencies (TBF) were obtained and analyzed. The results indicate that the average velocity in the circular tank is always higher than that in the square arc angle tank, while the flow field uniformity coefficient (UC₅₀) of the circular tank is lower than that in the square arc angle tank except for cases of fish-free tank and tank with TBF = 3 Hz. Additionally, the circulation characteristics in the circular tank are always regular, but that in the square arc angle tank is not regular until TBF ≥ 2.5 Hz. Compared with fish-free circular tank, the presence of a school of fish in the tank significantly reduces the average velocity and UC₅₀ which are improved with the increase of TBF. In the square arc angle tank, the average velocity first decreases slowly and then increases rapidly, and UC₅₀ slowly increases and finally converges to 0.7. This study provides a numerical approach to simulate the movement of fish groups in the aquaculture tank, which can potentially promote fish kinematics research in the tank.

以往对水产养殖池水动力的研究主要是在空池的基础上进行的，但鱼群的运动对池内的水动力有显着的影响。本研究基于计算流体力学（CFD）建立了鱼群与池内流场耦合的数值模型，模拟了圆形池和方弧角池中鱼群的波动运动。通过物理模型实验系统验证了该数值模拟方法的准确性。获得并分析了两个无鱼池（对照组）和14个不同尾拍频率（TBF）鱼群影响下的水动力情况。结果表明，圆形水箱内的平均流速始终高于方弧角水箱，而除特殊情况外，圆形水箱的流场均匀系数（UC ₅₀）均低于方弧角水箱。无鱼池和 TBF = 3 Hz 的池。另外，圆形水箱中的循环特性始终是规则的，而方弧角水箱中的循环特性直到TBF≥2.5 Hz才变得规则。与无鱼的圆形水箱相比，水箱中鱼群的存在显着降低了平均速度和UC ₅₀，并且随着TBF的增加而提高。在方弧角槽中，平均速度先缓慢减小，后快速增大，UC ₅₀缓慢增大，最终收敛于0.7。本研究提供了一种模拟水产养殖池中鱼群运动的数值方法，有可能促进水产养殖池中鱼类运动学的研究。