不同网格尺度对浮体水动力学性能的影响  

Influence of Mesh Scale on Hydrodynamic Characteristics of Floating Body

作　　者：崔贞[1] 王珊[1] 傅宗甫[1] 陈月君[1] 

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2016年第12期101-105,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51279048);江苏省自然科学基金项目(BK2011744);中央高校基本科研业务费专项资金项目(2016B40414)

摘　　要：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。Aiming at the problem that the mesh scale selection has impact on the accuracy and stability of hydraulic model numerical simulation,based on the FLOW-3Dsoftware,RNGκ-εpsilon turbulence model was used to analyze hydrodynamic characteristics of floating body structure in different mesh scales by using the VOF method to track the free surface.It mainly analyzed the impact of mesh scale selection on the interface between fluid and floating body structure.And then the change of flow velocity,streamline,flow and free surface were determined.Compared with the test results,the optimal mesh scale was obtained.The results show that the requirements of mesh independence is met and the precision errors of the hydraulic elements of test measure results are less than 1.50% when floating body was simulated by using 0.1times minimum structure size as the mesh scale.Thus,it provides reference for similar numerical simulation.

关 键 词：FLOW-3D CFD模拟 网格尺度 水力学要素 

分 类 号：O35[理学—流体力学]