摘要在本文中，我们使用一种汽液含相变热传递LBM模型对两相流问题中的气泡演化问题进行了模拟研究。首先本文使用Shan-Chen模型分别模拟了二维情况下单个气泡和两个气泡的出现、生长、脱离、运动、融合等一系列的物理过程，相关模拟结果均与实验结果符合很好。通过流场分析解释了泡核沸腾的传热机理，对一些参数的影响做了定量分析，结论与前人研究相符，验证了LBM在含传热两相流领域的适用性。另外本文还模拟了三维情况下单个及两个气泡的演变过程，发现三维情况下模拟出的气泡行为更接近于实验结果，对三维程序的局限性进行了分析讨论。最后本文初步介绍了He-Chen-Zhang两相流模型，并进行了Laplace定律验证和Rayleigh-Taylor不稳定性模拟等基本研究。87614

毕业论文关键词  格子Boltzmann方法  两相流  热传递  气泡动力学

毕业论文外文摘要

Title       Lattice Boltzmann method numerical simulation of    vapor-liquid two-phase flow containing phase change                                           

Abstract In this paper, The evolution of bubbles in thermal two-phase flows is studied using a two-phase Lattice Boltzmann Method (LBM)。 Firstly,the emergence, growth, detachment, and movement of a single bubble or two bubbles were simulated using two-dimensional Shan-Chen LBM。 Simulation results are in good agreement with the experimental results。 Through the flow field analysis, Nucleate boiling is explained。Effects of gravity, contact angle, surface temperature on the nucleation are investigated, and Conclusions are consistent with those in the literature。 Hence, the LBM is validated。 The three-dimensional evolution of a single bubble and two bubbles are also simulated。 and it is found that the bubble behaviors in three-dimensional are closer to the experimental results than those in two-dimensional case。 The limitations of the program in three-dimensional are discussed。 Finally, a preliminary study on the He-Chen-Zhang two-phase model is carried out。The method is validated by simulations of bubbles and the Rayleigh-Taylor Instability。

Keywords  Lattice Boltzmann method  Two-phase flow  Heat transfer  Bubble dynamics

目   次

1  绪论 1

1。1  研究背景 1

1。2  本文主要工作 2源-于,优+尔^论=文.网wwW.yOueRw.com 原文+QQ752.018766

2  格子Boltzmann方法 3

2。1  格子Boltzmann方法发展概述 3

2。2  格子Boltzmann方法的基本方程和原理 3

2。3  边界条件 7

3  Shan-Chen二维模型对泡核沸腾的模拟 10

3。1  模型简介 11

3。2  单个气泡生长与脱离的模拟研究 15

3。3  慢速流动下的气泡行为模拟 25

3。4  双气泡行为及相互作用模拟 28

4  Shan-Chen三维模型对泡核沸腾的模拟 32

4。1  MPI简介 32

4。2  单个气泡生长和脱离的模拟 33

4。3  双气泡融合模拟