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CFD modeling of transient flow in pressurized pipes

机译：压力管道中瞬变流的CFD建模

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The aim of this article is the analysis of the hydraulic transient flows in pressurized pipes using Computational Fluid Dynamics (CFD). The model uses a three-dimensional efficient mesh with a refined mesh in the viscous sublayer, corresponding to the best compromise between the maximum accuracy and the minimum computational effort. CFD results have been compared with collected data from an experimental pipe-rig and an excellent fitting was observed, providing that a hyperbolic time-domain function be used to describe the valve closure. Calculated velocity profiles have shown two regions with different behaviors: the wall region, dominated by the fluid viscosity, in which flow changes are faster and with sharp gradients; and the pipe core, strongly dependent on the fluid inertial forces, that tends to maintain its initial steady-state shape and to have memory of the past time history of the velocity distribution. Immediately after the valve closure, the flow is cancelled in the valve section, an invert flux is generated and a vortex sheet is formed (i.e., a cylindrical surface composed of vortices in the circumferential direction), propagating to the upstream end. The transient wall shear stress has shown a strong dependence on the time history of the local velocity variation. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文的目的是使用计算流体力学（CFD）分析加压管道中的液压瞬态流动。该模型使用在粘性子层中具有精细网格的三维有效网格，对应于最大精度和最小计算量之间的最佳折中。已将CFD结果与从实验钻机收集的数据进行了比较，并观察到了很好的拟合，条件是使用双曲线时域函数来描述阀门的关闭状态。计算出的速度曲线显示了两个具有不同行为的区域：以流体粘度为主的壁区域，其中流体的变化较快且具有明显的梯度;管芯强烈地依赖于流体惯性力，它倾向于保持其初始稳态形状并具有对速度分布的过去时间历史的记忆。在阀关闭之后，立即在阀部分中取消流动，产生反向通量并形成涡流片（即，由圆周方向上的涡流组成的圆柱表面），并传播到上游端。瞬时壁剪应力已显示出对局部速度变化的时间历程的强烈依赖性。 （C）2015 Elsevier Ltd.保留所有权利。

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