方腔内双扩散混合对流非线性格子Boltzmann研究  

Lattice Boltzmann Study of Nonlinear Characteristics of Double Diffusive Mixed Convection in an Enclosure

作　　者：李贝贝[1] 王婷婷[1] 陈建[1] 徐洪涛[1] 杨茉[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《计算物理》2016年第2期156-162,共7页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(51276117);上海市科委自然科学基金(12ZR1420900)资助项目

摘　　要：采用格子Boltzmann方法对方腔内双扩散混合对流的非线性特性进行数值模拟.发热圆位于方腔中心,流体从方腔左侧底部流进,流出位置分别为顶部右侧、中间和左侧三种情况.结果表明,不同参数下的双扩散混合对流存在稳态定常解、周期性振荡解和非周期性振荡解,监测点速度相图分别表现为最终到达一个点、一个封闭环和没有规律的曲线.Lattice Bohzmann method is adopted to numerically analyze nonlinear characteristics of double diffusive mixed convection in an enclosure. A heated cylinder is located at center of the enclosure. Fluid flows from an inlet at lower-left wall of enclosure and an outlet is at upper-right, upper-middle and upper-left wall respectively. Simulation results indicate that there are steady stationary solution, periodic and aperiodic oscillatory solutions in double diffusive mixed convection at different parameters. Phase path of velocity of monitoring point finally reaches a point, a closed loop and irregular curves, respectively.

关 键 词：方腔 格子BOLTZMANN 双扩散混合对流 非线性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]