Poiseuille-Rayleigh-Benard流动中的局部行波对流  

Localized traveling wave convection in Poiseuille-Rayleigh-Benard Flows

作　　者：宁利中[1] 周洋[1] 王思怡[1] 李国栋[1] 张淑芸[1] 周倩[1] 

机构地区：[1]西安理工大学水利水电学院,西安710048

出　　处：《水动力学研究与进展（A辑）》2010年第3期299-306,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(10872164);教育部留学回国人员基金项目(220542);陕西省教育厅专项计划项目(09JK643);西安理工大学科研基金项目(210532)资助

摘　　要：Poiseuille-Rayleigh-Benard流动是研究非平衡对流的斑图(pattern)及非线性动力学特性的典型模型之一。本文通过流体力学基本方程的数值求解,研究了二维矩形腔体中水平来流和瑞利数对Poiseuille-Rayleigh-Benard流动中的局部行波斑图形成的影响。当水平来流强度为定值时,随着瑞利数的增加,能够依次出现有水平流动的传导状态,局部行波对流和充分发展的行波对流等3种斑图。如果瑞利数被固定,随着水平来流强度的增加,依次出现充分发展的行波对流,局部行波对流和有水平流动的传导状态等3种斑图。局部行波对流的存在宽度依赖于水平来流强度和瑞利数。并进一步讨论了局部行波斑图的动力学特性。The Poiseuille-Rayleigh-Benard flow is one of typical models for studying the patterns and nonlinear dynamics of nonequilibrium convection.By using a two-dimensional numerical simulation of the fully hydrodynamic equations,the influence of lateral flows and Rayleigh numbers on the formation of localized traveling wave pattern in Poiseuille-RayleighBenard flows in a rectangular channel is studied.When the density of lateral flows is constant,with increasing Rayleigh number,it is possible to sequentially occur three types of patterns such as conduction with horizontal flows,localized traveling wave convection and fully developed traveling wave convection.If Rayleigh number is fixed,with increasing the density of lateral flows,there occur sequentially three types of patterns such as fully developed traveling wave convection,localized traveling wave convection and conduction with horizontal flows.The width of localized traveling wave convection depends on the density of lateral flows and Rayleigh number.Further,the dynamics of the localized traveling wave patterns is discussed in this paper.

关 键 词：Poiseuille-Rayleigh-Benard流动 局部行波 动力学 斑图 

分 类 号：O357[理学—流体力学]