A Preliminary Study on the Simulation of Vortex Flow in Pump Intake Based on LBM-VOF-LES Combined Model
A Preliminary Study on the Simulation of Vortex Flow in Pump Intake Based on LBM-VOF-LES Combined Model
复制标题
基于LBM-VOF-LES组合模型的泵进气涡流模拟初步研究
DOI：
10.1115/1.4049684
复制
发表时间：
2021-05
期刊：
影响因子：
--
通讯作者：
Xiaoyan Shi
中科院分区：
文献类型：
--
作者：
Miao Guo;Xuelin Tang;Xiaoqin Li;Fujun Wang;Xiaoyan Shi
本文将格子玻尔兹曼法-大涡模拟（LBM-LES）模型与流体体积（VOF）法相结合，用于模拟典型泵入口处的涡流。 LES 模型中的应变率张量是利用基于 Chapman-Enskog 展开式的非平衡矩进行局部计算的，并且对于实体壁的非滑移条件使用反弹方案，对于自由表面使用 VOF 方法。自由表面上各类细胞的演化是基于VOF方法中的质量交换，即格子玻尔兹曼-单相（LB-SP）自由表面模型。外力项的引入是通过在格子玻尔兹曼方程（LBE）右侧添加相应表达式并修改速度来建立的。预测的涡流模式（涡流的核心位置和强度）和速度与物理模型进行的实验相关。结果的比较证明了模型和数值方法在预测泵入口内涡流的可行性和稳定性。本文开发和提出的模型提供了一种从细观角度分析泵进口涡流流型的新方法，丰富了相关技术，为进一步的工程应用做出了相应的贡献。
In this paper, the lattice Boltzmann method-large eddy simulation (LBM-LES) model was combined with the volume of fluid (VOF) method and used to simulate vortex flow in a typical pump intake. The strain rate tensor in the LES model is locally calculated utilizing nonequilibrium moments based on Chapman–Enskog expansion, and the bounce-back scheme is used for nonslip condition on the solid wall and VOF method for the free surface. The evolution of all kinds of cells on the free surface is based on the mass exchange in the VOF method, i.e., lattice Boltzmann-single phase (LB-SP) free surface model. The introduction of the external force terms is established through adding corresponding expressions on the right of the lattice Boltzmann equation (LBE), and by modifying the velocity. The predicted vortex flow patterns (core location and strength of the vortex) and velocity correlate with the experiments undertaken with the physical model. A comparison of the results demonstrates the feasibility and stability of the model and the numerical method in predicting vortex flows inside pump intakes. The model developed and presented in this paper provides a new analysis method of vortex flow patterns in pump intake from a mesoscopic perspective, enriches the relevant technologies, and makes corresponding contributions to further engineering applications.
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DOI：
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