【作者】 栾辉宝； 徐辉； 陈黎； 陶文铨；

【Author】 Luan Huibao,Xu Hui,Chen Li,Tao Wenquan(School of Energy& Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

【机构】 西安交通大学能源与动力工程学院；

【摘要】 近年来,多尺度数值模拟方法发展迅速,为研究多尺度现象提供了一条有效的途径.在模拟复杂流动问题时,如果仅采用宏观方法,则会存在一些不足,诸如无法预知微小部分的流动细节以及引入经验关联式;如果仅采用介观\微观方法,则需要消耗大量的计算资源.基于单一方法的不足,本文构造了宏观有限容积法(FVM)与介观格子Boltzmann方法(LBM)的耦合模型(CFVLBM).CFVLBM的关键在于如何由FVM中宏观量重构出LBM中密度分布函数.文中给出了具有二阶精度的重构算子.选取两个三维流动问题,方形通道内充分发展流动和顶盖驱动流对模型进行了考核,计算结果同基准解符合的很好.研究表明,基于文中重构算子的CFVLBM可以准确有效地应用于模拟三维流动问题.更多还原

【Abstract】 Multiscale numerical simulation has been developed very fast in recent years.When conventional numerical methods are singly adopted for complicated problems,some distinct limitations will occur,among whom the lack of detail for some local processes and the necessity of introduction empirical closures are especially obvious.These shortcomings may be overcome if we use single meso/microscale methods.However,the required computer source is out of reality.By coupling macro/meso scale methods,macro/micro methods or macro/meso/micro methods such difficulty can be,to a great extent,overcome.A coupling model(CFVLBM)has been proposed.In this paper,CFVLBM is extended to 3D fluid flow by two numerical examples.For the steady fully-developed duct flow,the predicted results are agree closely with the analytic results.For the lid-driven cavity flow,the quantitative as well as qualitative results are in good agreement with benchmark results.The results show the proposed reconstruction operator is accurate and effective and the CFVLBM can be adopted in the 3D fluid flow problems.更多还原