基于格子玻尔兹曼的管道重力流充水和排空三维瞬变过程模拟

发布时间：2018-04-13 03:25

本文选题：重力流 + 格子玻尔兹曼　；参考：《中国农村水利水电》2017年01期

【摘要】：对于重力流管道的空管充水和满管排空过程,由于边界条件随位置和时间都在变化,用传统的特征线法较难求解。探索一种新的三维瞬态模拟方法求解重力流瞬变过程,利用格子玻尔兹曼方法分别模拟重力流管道系统的充水和排空阶段。与传统的系统一维分析方法不同,本次使用的基于介观模型的格子玻尔兹曼方法根据流体微观运动过程的基本特征建立了管道重力流的时间和空间离散动力学格子模型,介观流体粒子的分布和运动过程遵从动力学统计定律,对流场中大量粒子的统计平均可得到流体的宏观运动变量,因此通过该方法能可视化地得出本次研究的管道充水及排空阶段的液面变化过程、充满和排空时间、进口和出口闸阀开启的流态变化过程及阀后监测点的压力、流速变化曲线等。同时对相同的管道系统进行传统的一维计算,并与三维模拟结果进行对比和验证。利用CFD技术分析系统级别的管道流场是一个创新的研究方向,不但能使结果精度提高,而且能够可视化地分析系统内需要关注位置的流场瞬变过程。
[Abstract]:Because the boundary conditions change with the position and time, the traditional characteristic line method is difficult to solve the empty pipe filling and emptying process of gravity flow pipeline.A new three-dimensional transient simulation method is proposed to solve the transient process of gravity flow. The lattice Boltzmann method is used to simulate the filling and emptying stages of gravity flow pipeline system respectively.Different from the traditional one-dimensional analysis method, the lattice Boltzmann method based on mesoscopic model is used to establish the time-space discrete dynamic lattice model of the gravity flow in pipeline according to the basic characteristics of the microscopic motion process of the fluid.The distribution and motion of mesoscopic fluid particles follow the statistical law of dynamics, and the macroscopic motion variables of the fluid can be obtained on average by statistics of a large number of particles in the flow field.Therefore, this method can be used to visualize the process of liquid level change, the filling and emptying time, the flow state change process of inlet and outlet gate valve opening and the pressure at the monitoring point behind the valve in the stage of pipeline filling and emptying.Velocity variation curve, etc.At the same time, the traditional one-dimensional calculation of the same pipeline system is carried out, and compared with the three-dimensional simulation results.It is an innovative research direction to use CFD technology to analyze system-level pipeline flow field. It can not only improve the accuracy of the results, but also visually analyze the transient process of the flow field in the system which needs to pay attention to the position.
【作者单位】：甘肃省水利厅水利管理局;武汉大学动力与机械学院;
【基金】：国家自然科学基金资助项目(51297145) 水利部948项目(201321)
【分类号】：TV134

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