Two-dimensional simulation of Poiseuille-Rayleigh-Bénard flows in binary fluids with Soret effect  

作　　者：Hu Jun Yin Xieyuan 

机构地区：[1]Institute of Applied Physics and Computational Mathematics, Beijing 100088, China [2]Department of Modern Mechanics, Univer-sity of Science and Technology of China, Hefei 230027, China

出　　处：《Progress in Natural Science:Materials International》2007年第12期1389-1396,共8页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant Nos .10676005,10676120,10676004,10702011)

摘　　要：Poiseuille-Rayleigh-Benard flows in binary fluids with Soret effect are directly simulated by a mixed finite element method. A temperature perturbation is used as an initial disturbed source for the basic parallel flows. The whole spatio-temporal evolution of the binary fluid flows is exhibited： initially only the disturbed mode with the wavenumber k =π is amplified while others are damped, and continuously the amplified mode grows further and the nonlinear effect becomes important; after a nonlinear evolution transition the flow system evolves finally into a periodic right traveling wave.Poiseuille-Rayleigh-Bénard flows in binary fluids with Soret effect are directly simulated by a mixed finite element method. A temperature perturbation is used as an initial disturbed source for the basic parallel flows. The whole spatio-temporal evolution of the binary fluid flows is exhibited: initially only the disturbed mode with the wavenumber k=π is amplified while others are damped, and continuously the amplified mode grows further and the nonlinear effect becomes important; after a nonlinear evolution transition the flow system evolves finally into a periodic right traveling wave.

关 键 词：Poiseuille-Rayleigh-Benard flow Soret effect through-flow. 

分 类 号：O35[理学—流体力学]