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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Application of the lattice Boltzmann method for large-scale hydraulic problems
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Application of the lattice Boltzmann method for large-scale hydraulic problems

机译：格子玻尔兹曼方法在大型水力问题中的应用

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摘要

Purpose - The purpose of this paper is to prove the validity of the front-tracking variant of the lattice Boltzmann method (LBM) to simulate free surface hydraulic flows (i.e. dam break flows). Design/methodology/approach - In this paper, an algorithm for free surface simulations with the LBM method is presented. The method is chosen for its computational efficiency and ability to deal with complex geometries. The LBM is combined to a surface-tracking technique applied to a fixed Eulerian mesh in order to simulate free surface flows. Findings - The numerical method is then validated against two typical cases of environmental-hydraulic interest (i.e. dam break) by comparing LBM results with experimental data available in literature. The results show that the model is able to reproduce the observed water levels and the wave fronts with reasonable accuracy in the whole period of the transient simulations, thus highlighting that the present method may be a promising tool for practical dam break analyses. Originality/value - Even if the main philosophy of the proposed method is equal to the volume of fluid technique usually coupled to Navier-Stokes models, no additional differential equation is needed to determine the relative volume fraction of the two phases, or phase fraction, in each computational cell, as the free-surface tracking is automatically performed. This results in a method very simple to be coded with high computational efficiency. The results presented in this paper are the first, to the best of the authors' knowledge, in the field of hydraulic engineering.
机译：目的-本文的目的是证明格子Boltzmann方法（LBM）用于模拟自由表面水力流（即溃坝流）的前向跟踪变量的有效性。设计/方法/方法-在本文中，提出了一种使用LBM方法进行自由表面模拟的算法。选择该方法的原因是它的计算效率和处理复杂几何图形的能力。 LBM与应用于固定欧拉网格的表面跟踪技术结合在一起，以模拟自由表面流。研究结果-然后，通过将LBM结果与文献中提供的实验数据进行比较，针对两种典型的环境-水利工程案例（即大坝溃坝）验证了该数值方法。结果表明，该模型能够在瞬态模拟的整个过程中以合理的精度再现观测到的水位和波阵面，从而突显了该方法可能是实用的溃坝分析工​​具。独创性/价值-即使所提出方法的主要原理等于通常与Navier-Stokes模型耦合的流体技术的体积，也不需要额外的微分方程来确定两个相的相对体积分数或相分数，在每个计算单元中，自动执行自由表面跟踪。这导致一种非常容易以高计算效率进行编码的方法。据作者所知，本文提出的结果是水利工程领域中第一个。

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