In traditional pigging operations, sealed disks having a specific amount of interference guarantee that the pig runs at the velocity of the gas behind it. A bypass flow path in the pig lowers its speed while causes the uneven pig motion, which is referred to as slippage. The slippage raises the risk of the pig becoming stuck and negatively impacts the pipe and related facilities. This paper proposes a numerical method to solve a pigging model consisting of arbitrary Lagrange-Euler forms of the fluid flow equations and the bypass pig kinetic equation based on the moving grid method, which considers the contact surfaces between the pig and the fluid as discretized grid nodes. A detailed moving mesh was adopted to study the flow field around the pig. The consistency between the numerical and experimental results demonstrates the accuracy and applicability of the numerical method. Gas compressibility is primarily responsible for the transitional motions of the pig, especially its gradual restarting and the gradually smoothed velocity. Furthermore, the variation in the friction force is the primary factor that determines the appearance of the pigging stoppage and the scale of the pig resting and the next uneven pig velocity.

在传统的清管操作中，具有特定干扰量的密封盘可确保清管器以其后的气体速度运行。清管器中的旁路流路会降低其速度，同时导致清管器运动不均匀，这称为打滑。滑移会增加清管器被卡住的风险，并对管道和相关设施产生负面影响。本文提出了一种基于运动网格法求解由任意Lagrange-Euler形式的流体流动方程和旁通清管动力学方程组成的清管模型的数值方法，该方法将清管与流体之间的接触面视为离散网格。节点。采用了详细的移动网格来研究猪周围的流场。数值和实验结果之间的一致性证明了数值方法的准确性和适用性。气体可压缩性主要负责清管器的过渡运动，尤其是其逐渐重新启动和逐渐平滑的速度。此外，摩擦力的变化是决定清管停止的外观，清管器的大小和下一个不均匀的清管器速度的主要因素。