一种新的混合流体对流竖向镜面对称对传波斑图
发布时间：2019-03-16 21:13
【摘要】：利用SIMPLE算法对混合流体对流的流体力学基本方程组进行了数值模拟,在混合流体分离比ψ=-0.6和矩形腔体长高比Γ=20的情况下,首次发现了一种新的竖向镜面对称对传波斑图,并初步探讨了它的动力学特性.竖向镜面对称对传波斑图的中心为驻波,随着时间的发展驻波的波长伸长.当波长增加到某个临界值时,一个滚动分裂成两个滚动,在这两个滚动之间产生一个具有180°相位差的新滚动.位于中心线上的滚动只有相位的突变及其波长的压缩或者伸长,没有对流滚动的移动,在它的两侧是向左右传播的对流滚动.驻波两次相位突变形成一个周期,驻波周期随着相对Rayleigh(瑞利)数Rar的增加而增加.这种对流结构存在于相对Rayleigh数Rar∈(3.6,4.3]的范围.当相对Rayleigh数Rar≤3.6时,系统出现具有缺陷的行波斑图;当Rar4.3时系统过渡到行波斑图.说明竖向镜面对称对传波斑图是存在于具有缺陷的行波斑图和行波斑图之间的一种稳定的对流斑图.
[Abstract]:The basic equations of fluid dynamics for mixed fluid convection are numerically simulated by using the SIMPLE algorithm. When the separation ratio of mixed fluid is 蠄 =-0.6and the ratio of length to height of rectangular cavity is 螕 = 20. A new vertical mirror symmetry wave transfer pattern is discovered for the first time, and its dynamic characteristics are discussed. The center of vertical mirror symmetry wave-transmitting pattern is standing wave, and the wavelength of standing wave extends with the development of time. When the wavelength increases to a certain critical value, one roll splits into two scrolls, and a new roll with 180 掳phase difference is generated between the two scrolls. The rolling on the center line is only the abrupt change of phase and the compression or elongation of its wavelength, without the movement of convective rolling, and on both sides of it is a convective roll that propagates to the left and right. The standing wave period increases with the increase of relative Rayleigh (Rayleigh) number Rar. This convection structure exists in the range of relative Rayleigh number Rar 鈭，
本文编号：2441969
[Abstract]:The basic equations of fluid dynamics for mixed fluid convection are numerically simulated by using the SIMPLE algorithm. When the separation ratio of mixed fluid is 蠄 =-0.6and the ratio of length to height of rectangular cavity is 螕 = 20. A new vertical mirror symmetry wave transfer pattern is discovered for the first time, and its dynamic characteristics are discussed. The center of vertical mirror symmetry wave-transmitting pattern is standing wave, and the wavelength of standing wave extends with the development of time. When the wavelength increases to a certain critical value, one roll splits into two scrolls, and a new roll with 180 掳phase difference is generated between the two scrolls. The rolling on the center line is only the abrupt change of phase and the compression or elongation of its wavelength, without the movement of convective rolling, and on both sides of it is a convective roll that propagates to the left and right. The standing wave period increases with the increase of relative Rayleigh (Rayleigh) number Rar. This convection structure exists in the range of relative Rayleigh number Rar 鈭，
本文编号：2441969
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