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鉴于网格尺度的选择对水力模型数值模拟的精确性和稳定性具有重要影响,应用FLOW-3D软件,采用RNGκ-ε紊流模型,利用VOF法追踪自由表面,对不同网格尺度下浮体结构的水动力学特性进行分析,重点对比网格尺度的选择对流体与浮体结构交界面的影响,同时给出了流速、流线、流量及自由表面的变化,并与试验结果进行对比,得到最优网格尺度。结果表明,当选用最小结构尺寸0.1倍的网格尺度模拟浮体结构时,不仅可以满足网格的独立性要求,而且与试验测量的各水力学要素精度误差都小于1.50%,从而为类似的数值模拟提供了一定的参考依据。
Since the selection of grid scale has an important influence on the accuracy and stability of numerical simulation of hydraulic model, FLOW-3D software is used to simulate the turbulence model with RNG κ-ε and the free surface is tracked by VOF method. The hydrodynamic characteristics were analyzed. The influence of the selection of grid scale on the interface between fluid and floating structure was contrasted. The changes of flow velocity, flow line, flow rate and free surface were also compared. The results were compared with the experimental results Excellent grid size. The results show that when the floating body structure is simulated with a grid scale of 0.1 times the minimum structural size, not only the independence of the grid can be satisfied, but also the errors of precision of the hydrodynamic elements with the experimental measurements are less than 1.50% Simulation provides some reference.