A problem about tubing string vibration caused by the fluid unsteady flow inside tubing string is studied from the Angle of solid liquid coupling vibration in dynamics.

文章从动力学中固液耦合振动的角度出发，研究了油管柱内流体不稳定流动引起的油管柱振动问题。

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According to the basic conception of fluid-solid coupling seepage flow theory, an equation of motion should be founded.

根据流固耦合渗流理论的基本思想，建立流固耦合渗流运动方程。

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Then the Lagrange particle track model and the uniphase coupling method are used to simulate the gas-solid two phase flow field in the centrifugal fan.

再采用拉格朗同颗粒轨道模型，利用单相耦合法模拟了风机内部的气固两相流场。

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