本文關(guān)鍵詞： Rayleigh-Benard對流 成長率 時空斑圖 周期性　出處：《應(yīng)用數(shù)學和力學》2017年10期 　論文類型：期刊論文

【摘要】：對Pr=0.027 2的純流體在矩形腔體外加水平來流時,進行二維流體力學基本方程組的數(shù)值模擬.研究了該純流體Rayleigh-Benard對流的一維行波斑圖的成長及時空的演化.發(fā)現(xiàn)對流成長過程可以劃分為3個階段,即對流發(fā)展、對流指數(shù)成長和周期變化.在對流指數(shù)成長階段對不同相對Rayleigh(瑞利)數(shù)Rar的最大垂直流速場隨時間變化的情況進行分析,獲得了最大垂直流速場指數(shù)成長階段的線性成長率γm和相對Rayleigh數(shù)Rar的關(guān)系公式.研究了行波周期受水平來流Reynolds(雷諾)數(shù)的影響,揭示了行波對流周期性及其對水平來流Reynolds數(shù)的依賴性.
[Abstract]:When the pure fluid of Pr=0.027 _ 2 flows horizontally in a rectangular cavity, The numerical simulation of the basic equations of two-dimensional hydrodynamics is carried out. The growth of the one-dimensional traveling wave pattern and the evolution of the spacetime of the Rayleigh-Benard convection are studied. It is found that the convection growth process can be divided into three stages, that is, the convection development. Convection exponent growth and periodic variation. The variation of the maximum vertical velocity field with time at different relative Rayleigh (Rayleigh) numbers Rar is analyzed during the convection exponential growth stage. The relationship between the linear growth rate 緯 m and the relative Rayleigh number Rar in the exponential growth stage of the maximum vertical velocity field is obtained. The effect of the traveling wave period on the horizontal flow Reynolds number is studied. The periodicity of traveling wave convection and its dependence on the Reynolds number of horizontal flow are revealed.
【作者單位】： 西安理工大學西北旱區(qū)生態(tài)水利工程國家重點實驗室培育基地;嘉興學院建筑工程學院;上海大學建筑系;
【基金】：國家自然科學基金(10872164) 陜西省重點學科建設(shè)專項資金資助項目(00X901)~~
【分類號】：O35
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本文編號：1494137