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| 侧加热腔体内重力波演化过程的数值模拟 | |
| 引用本文： | 马丽娟,徐丰,胡非,张德良.侧加热腔体内重力波演化过程的数值模拟[J].力学与实践,2006,28(5):19-23,38. |
| 作者姓名： | 马丽娟 徐丰 胡非 张德良 |
| 作者单位： | 1. 中国科学技术大学信息科学技术学院,合肥,230027;中国科学院大气物理研究所,北京,100029 2. School of Engineering,James Cook Zniversity,QLD 4811,Australia;中国科学院力学研究所,北京,100080 3. 中国科学院大气物理研究所,北京,100029 4. 中国科学院力学研究所,北京,100080 |
| 基金项目： | 国家自然科学基金项目（20490206）资助. |
| 摘 要： | 利用二维数值模拟的方法研究了侧加热腔体内的自然对流．基于数值模拟结果,描述了水平热入侵流(intrusion)的整个演化过程,并对该过程的物理机制进行了讨论．结果表明：当热入侵流抵达腔体冷壁后,由于冷壁无法卷入所有的热入侵流,热入侵流在冷上角堆积并产生一个反向流动,在冷壁边界层附近形成一个顺时针涡,该涡在浮力效应驱动下可返回热壁,并在腔体的冷热壁之间形成了腔体尺度的流体振荡,即内重力波． |
| 关 键 词： | 腔体 自然对流 入侵流 内重力波 数值模拟 |
| 收稿时间： | 2006-03-16 |
| 修稿时间： | 2006-03-162006-05-08 |
NUMERICAL SIMULATION OF THE FORMATION AND DEVELOPMENT OF INTERNAL GRAVITY WAVE IN A DIFFERENTIALLY HEATED CAVITY |
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| MA Lijuan,XU Feng,HU Fei,ZHANG Deliang.NUMERICAL SIMULATION OF THE FORMATION AND DEVELOPMENT OF INTERNAL GRAVITY WAVE IN A DIFFERENTIALLY HEATED CAVITY[J].Mechanics and Engineering,2006,28(5):19-23,38. | |
| Authors: | MA Lijuan XU Feng HU Fei ZHANG Deliang |
| Institution: | 1.School of Information Science and Technology, University of Science and Technology of China, Hefei 230027, China;2.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;3.School of Engineering, James Cook University, QLD 4811, Australia;4.Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China |
| Abstract: | A two dimensional numerical simulation of natural convection in a differentially heated cavity is performed.The evolution of the horizontal hot intrusion is observed and its physical properties are described. The numerical results show that,after the hot intrusion reaches the cold wall,some accumulates in the cold top corner,since the cold boundary layer flow cannot entrain all of the hot intrusion.Due to the hot fluid accumulation and the buoyancy effect,a reverse flow (opposing the cold boundary layer flow) first arises in the cold top corner,and then forms a clockwise local circulation.This circulation may move back to the hot wall, and ultimately a cavity-scale oscillation (i.e.internal gravity wave) is resulted between the hot and cold walls underneath the ceiling of the cavity.Such oscillation significantly decays with the passage of time,and almost disappears after two periods. |
| Keywords: | cavity natural convection intrusion internal gravity wave numerical simulation |
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