The aquaculture tank is an infrastructure for aquaculture, and the choice of its geometry, structural design of the inlet and outlet pipes and the placement position and other parameters are crucial to the influence of the hydrodynamic performance of the tank. In this paper, a numerical computational model of the hydrodynamics of a dual-channel rectangular circular-angle culture tank is established using the RNG k-ε turbulence model based on the Reynolds-averaged N-S equation (RANS) averaged over time. The three-dimensional simulation of the internal flow field of the breeding tank under the hydraulic drive mode of the dual inlet pipe structure was verified by comparing with the experimental results of the physical model, and the accuracy of the numerical model in simulating the flow characteristics in the rectangular circular-angle breeding tank was demonstrated. The model was further applied to study the effect of the relative inflow distance on the hydrodynamic characteristics inside the culture tank, and the energy effective utilization coefficient was proposed to measure the effective utilization of energy inside the culture tank system.The present study has shown that the relative inflow distance was an important parameter in the construction of the system flow field, the average velocity of aquaculture system (a = 0.05, P < 0.0001), the velocity distribution uniformity at the bottom of the tank as well as the kinetic energy gradient of flow field sublayer are significantly affected by which adjusting the relative inflow distance. The ratio parameter C/B in the range of 0.02–0.04 could effectively improve flow field characteristics of the system so as to get better hydrodynamic conditions for circulating aquaculture.

水产养殖池是水产养殖的基础设施，其几何形状的选择、进出水管道的结构设计和放置位置等参数对影响水池的水动力性能至关重要。本文利用RNG k-ε建立了双通道矩形圆角培养槽水动力数值计算模型基于随时间平均的雷诺平均 NS 方程 (RANS) 的湍流模型。通过与物理模型的实验结果对比，验证了双进水管结构液压驱动方式下养殖池内部流场的三维模拟，验证了数值模型模拟流动特性的准确性在矩形圆角养殖缸中进行了演示。进一步应用该模型研究了相对进水距离对养殖缸内水动力特性的影响，提出了能量有效利用系数来衡量养殖缸系统内能量的有效利用情况。a = 0.05, P  < 0.0001), 调节相对流入距离对罐底速度分布均匀性及流场子层动能梯度有显着影响。比值参数C/B在0.02~0.04范围内可有效改善系统的流场特性，从而为循环水养殖获得更好的水动力条件。