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首页> 外文会议>International Conference on Fluid Power Transmission and Control(ICFP' 2005); 20050405-08; Hangzhou(CN) >Flow Field in a Pipe with Sudden Expansion by FEM Method
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Flow Field in a Pipe with Sudden Expansion by FEM Method

机译：有限元法突然膨胀管中的流场

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摘要

In this paper, the finite element method (FEM) was used to discrete the continuity equation and the equation of stream-function(ψ)-vorticity(ω). The flow field in a sudden expansion with different Reynolds number and with different expansion ratios has been simulated. The vortices in the corner of the step was presented by the streamline and velocity profiles. Comparison of the flow field between different Reynolds numbers and expansion ratios are also demonstrated. The results show that the greater the expansion ratio is, the larger the vortices are. The greater the Reynolds number is, the more intensity of the vortices is. The study has significance for designing the pipe systems with sudden expansion to minimize the energy loss.
机译：在本文中，使用有限元方法（FEM）离散连续性方程和流函数（ψ）-涡度（ω）方程。模拟了不同雷诺数和不同膨胀比的突然膨胀中的流场。流线和速度曲线显示了该步骤拐角处的旋涡。还展示了不同雷诺数和膨胀率之间流场的比较。结果表明，膨胀比越大，涡旋越大。雷诺数越大，涡旋强度越大。该研究对于设计具有突然膨胀的管道系统以最小化能量损失具有重要意义。

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