稳定分层流动中湍流统计特性和输运特性的数值研究

邱翔; 黄永祥; 卢志明; 刘宇陆

稳定分层流动中湍流统计特性和输运特性的数值研究

上海大学上海市应用数学和力学研究所上海 200072;2.上海大学理学院数学系上海 200444

基金项目: 国家自然科学基金资助项目(10772110;10742005);上海市浦江计划资助项目

详细信息

作者简介:
邱翔(1978- ),男,山东临沂人,博士(E-mail:qiux@shu.edu.cn);刘宇陆,教授,博士(联系人.Tel:+86-21-56332507;E-mail:ylliu@staff.shu.edu.cn).

中图分类号: O357.5
计量
- 文章访问数: 2884
- HTML全文浏览量: 118
- PDF下载量: 1152
- 被引次数: 0
出版历程
- 收稿日期: 2008-06-25
- 修回日期: 2008-11-14
- 刊出日期: 2009-02-15

Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, P. R. China;

摘要

摘要: 采用大涡模拟方法研究了上下两层温度不同的稳定分层湍流，主要对其中的湍流尺度特性、统计特性和湍流输运特性，以及标量场的时空演化进行了分析研究．研究结果表明：浮力尺度沿流动方向先增加然后趋于某个稳定值，剪切越强，浮力尺度越大；翻转尺度沿流向也是逐渐增大，剪切越强，翻转尺度越大；统计特性的分析发现，在较大的区域内温度脉动的平坦因子都偏离Gauss分布，强分层条件下温度脉动的统计特性与速度脉动的统计特性有较明显差别；湍流混合的过程开始于小尺度运动，最后扩展到大尺度运动．
- 分层湍流 /
- 湍流混合 /
- 湍流输运 /
- 湍流结构
Abstract: Three dimensional large eddy simulation (LES) was performed in the investigation of stably stratified turbulence with a sharp thermal interface. Main results are focused on the turbulent characteristic scale, statistical properties, transport properties, and temporal and spatial evolution of the scalar field. Results show that the buoyancy scale increases first, and then goes to a certain constant value. The stronger the mean shear, the larger the buoyancy scale. The overturning scale increases with the flow, and the mean shear improves the overturning scale. The flatness factor of temperature departs from the Gaussian distribution in a fairly large region, and its statistical properties are clearly different from those of the veloaty fluctuations in a strong stratified case. Turbulent mixing starts from small scale motions, and then extends to large scale motions.
- stratified turbulence /
- turbulent mixing /
- turbulent transport /
- turbulence structure

HTML全文

参考文献(19)

[1]	Hansen J, Russell G, Lacis A,et al.Climate response times:dependence on climate sensitivity and ocean mixing[J].Science,1985,229(4716):857-859. doi: 10.1126/science.229.4716.857
[2]	Hopfinger E J. Turbulence in stratified fluids:a review[J].J Geophys Res,1987,92(C5):5287-5303. doi: 10.1029/JC092iC05p05287
[3]	Fernando H J S. Turbulent mixing in stratified fluids[J].Annu Rev Fluid Mech,1991,23(1):455-493. doi: 10.1146/annurev.fl.23.010191.002323
[4]	Riley J J, Lelong M P. Fluid motion in the presence of strong stratification[J].Annu Rev Fluid Mech,2000,32(1):613-657. doi: 10.1146/annurev.fluid.32.1.613
[5]	Peltier W R, Caulfield C P. Mixing efficiency in stratified shear flows[J].Annu Rev Fluid Mech,2003,35(1):135-167. doi: 10.1146/annurev.fluid.35.101101.161144
[6]	Ivey G N, Winters K B， Koseff J R. Density stratification, turbulence, but how much mixing?[J].Annu Rev Fluid Mech,2008,40:169-184. doi: 10.1146/annurev.fluid.39.050905.110314
[7]	Gerz T, Schumann U, Elghorashi S E. Direct numerical simulation of stratified homogeneous turbulent shear flows[J].J Fluid Mech,1989,200:563-594. doi: 10.1017/S0022112089000765
[8]	Holt S E, Koseff J R, Ferziger H. A numerical study of the evolution and structure of homogeneous stably stratified sheared turbulence[J].J Fluid Mech,1992,237:499-539. doi: 10.1017/S0022112092003513
[9]	Jacobitz F G, Sarkar S, Atta C W V. Direct numerical simulation of turbulence evolution in a uniformly sheared and stably stratified flow[J].J Fluid Mech,1997,342:231-261. doi: 10.1017/S0022112097005478
[10]	Shih L H, Koseff J R, Ferziger J H,et al.Scaling and parameterization of stratified homogeneous turbulent shear flow[J].J Fluid Mech,2000,412:1-20. doi: 10.1017/S0022112000008405
[11]	Gerz T, Howell J, Mahrt L. Vertex structures and microfronts[J]. Phys Fluids,1994,6:1242-1251. doi: 10.1063/1.868293
[12]	Diamessis P J, Nomura K K. Interactions of vorticity, rate-of-strain and scalar gradient in stratified homogeneous sheared turbulence[J].Phys Fluids,2000,12:1166-1188. doi: 10.1063/1.870369
[13]	Komori S, Nagata K. Effects of molecular diffusivities on counter-gradient scalar and momentum transfer in strongly stable stratification[J].J Fluid Mech,1996,326:205-237. doi: 10.1017/S0022112096008294
[14]	Nagata K, Komori S. The difference in turbulent diffusion between active and passive scalars in stable thermal stratification[J].J Fluid Mech,2001,430:361-380. doi: 10.1017/S0022112000003037
[15]	Kaltenbach H J, Gerz T, Schumann U. Large-eddy simulation of homogeneous and diffusion in stably stratified shear flow[J].J Fluid Mech,1994,280:1-40. doi: 10.1017/S0022112094002831
[16]	Dong Y H,Lu X Y,Zhuang L X.Large eddy simulation of thermally-stratified turbulent channel flow with temperature oscillation on the bottom wall[J].J Hydrodyn, Ser B,2004,16(1):34-38.
[17]	Qiu X, Zhang D X, Lu Z M,et al. Turbulent mixing and evolution in a stably stratified two-layer fluid[J].J Hydrodyn, Ser B,2009.
[18]	Turner J S. Buoyancy Effects in Fluids[M].Cambridge:Cambridge University Press, 1973.
[19]	Yoon K, Warhaft Z. The evolution of grid-generated turbulence under condition of stable thermal stratification[J].J Fluid Mech,1990,215:601-638. doi: 10.1017/S0022112090002786

施引文献

资源附件(0)

访问统计

点击查看大图

计量

文章访问数: 2884
HTML全文浏览量: 118
PDF下载量: 1152
被引次数: 0

姓名
邮箱
手机号码
标题
留言内容
验证码

留言板

稳定分层流动中湍流统计特性和输运特性的数值研究

作者简介:
邱翔(1978- ),男,山东临沂人,博士(E-mail:qiux@shu.edu.cn);刘宇陆,教授,博士(联系人.Tel:+86-21-56332507;E-mail:ylliu@staff.shu.edu.cn).

计量

Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows

计量

目录

留言板

稳定分层流动中湍流统计特性和输运特性的数值研究

作者简介: 邱翔(1978- ),男,山东临沂人,博士(E-mail:qiux@shu.edu.cn);刘宇陆,教授,博士(联系人.Tel:+86-21-56332507;E-mail:ylliu@staff.shu.edu.cn).

计量

出版历程

Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows

计量

出版历程

目录

作者简介:
邱翔(1978- ),男,山东临沂人,博士(E-mail:qiux@shu.edu.cn);刘宇陆,教授,博士(联系人.Tel:+86-21-56332507;E-mail:ylliu@staff.shu.edu.cn).