基于流场切割的异径管腐蚀产物膜流-固耦合多尺度模拟

Fluid-structure interaction of multiscale simulation method base on cutting flow field theory

利用管道湍流速度分布定律,提出解决第一类多尺度模拟存在的空间尺度匹配问题的新方法,即切割流场模型。并运用COMSOL Multiphysics多物理场数值模拟软件,对不同流向、流速、尺寸规格且覆盖有腐蚀产物膜的异径管进行了流-固耦合分析。结果表明:切割流场模型的计算结果较相似准则模型更贴近原始模型。异径管腐蚀产物膜最大变形量出现在小端,且与流向无关。随着流速和异径管大端与小端直径比的增大,腐蚀产物膜的变形量逐渐增加。

A cutting flow field model was proposed based on the pipe velocity distribution law of turbulence to solve the space scale matching problem of the first kind of multi-scale simulation.The COMSOL Multiphysics software was used to analyze the fluid-structure interaction of reducer covered by corrosion products at different velocities,flow directions and specifications.Results illustrated that cutting flow field model was more close to the original model than similarity criterion model.The maximum deformation of corrosion product film occurs at small end,and had no relation with the flow direction.The deformation of corrosion product film increased with the fluid velocity and the diameter ratio of large end and small end of the reducer.