發(fā)布時(shí)間：2019-03-16 21:13

【摘要】：利用SIMPLE算法對(duì)混合流體對(duì)流的流體力學(xué)基本方程組進(jìn)行了數(shù)值模擬,在混合流體分離比ψ=-0.6和矩形腔體長(zhǎng)高比Γ=20的情況下,首次發(fā)現(xiàn)了一種新的豎向鏡面對(duì)稱對(duì)傳波斑圖,并初步探討了它的動(dòng)力學(xué)特性.豎向鏡面對(duì)稱對(duì)傳波斑圖的中心為駐波,隨著時(shí)間的發(fā)展駐波的波長(zhǎng)伸長(zhǎng).當(dāng)波長(zhǎng)增加到某個(gè)臨界值時(shí),一個(gè)滾動(dòng)分裂成兩個(gè)滾動(dòng),在這兩個(gè)滾動(dòng)之間產(chǎn)生一個(gè)具有180°相位差的新滾動(dòng).位于中心線上的滾動(dòng)只有相位的突變及其波長(zhǎng)的壓縮或者伸長(zhǎng),沒(méi)有對(duì)流滾動(dòng)的移動(dòng),在它的兩側(cè)是向左右傳播的對(duì)流滾動(dòng).駐波兩次相位突變形成一個(gè)周期,駐波周期隨著相對(duì)Rayleigh(瑞利)數(shù)Rar的增加而增加.這種對(duì)流結(jié)構(gòu)存在于相對(duì)Rayleigh數(shù)Rar∈(3.6,4.3]的范圍.當(dāng)相對(duì)Rayleigh數(shù)Rar≤3.6時(shí),系統(tǒng)出現(xiàn)具有缺陷的行波斑圖;當(dāng)Rar4.3時(shí)系統(tǒng)過(guò)渡到行波斑圖.說(shuō)明豎向鏡面對(duì)稱對(duì)傳波斑圖是存在于具有缺陷的行波斑圖和行波斑圖之間的一種穩(wěn)定的對(duì)流斑圖.
[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 擄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，

本文編號(hào)：2441969