On the modeling of homogeneous turbulence in a stably stratified flow
On the modeling of homogeneous turbulence in a stably stratified flow
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稳定分层流中均匀湍流的建模
DOI：
10.1063/1.868655
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发表时间：
1995
影响因子：
4.6
通讯作者：
R. So
中科院分区：
文献类型：
--
作者：
T. Sommer;R. So
研究了稳定分层介质中不可压缩的均匀湍流的衰减。使用对浮力效应进行适当改进的传统高雷诺数双方程模型来计算速度场，而对温度场则调用依赖于速度场和温度方差传递及其耗散率的显式代数热通量模型。由此得出的模型可以正确解释浮力通量和流向热传输，并用于研究稳定分层介质中网格生成的湍流的衰减。此类流动显示垂直湍流热通量的反梯度传输。计算浮力频率范围为 0 至 2.42 的流量。结果与实验数据以及恒定湍流普朗特数模型、代数通量模型和二阶闭包的计算结果进行了比较。目前的模型被发现能够正确...
The decay of incompressible, homogeneous turbulence in a stably stratified medium is investigated. A conventional high‐Reynolds‐number, two‐equation model with suitable improvements for buoyancy effects is used to calculate the velocity field, while an explicit algebraic heat‐flux model that depends on the velocity field and the transport of the temperature variance and its dissipation rate is invoked for the temperature field. The model thus derived could account for buoyancy flux and streamwise heat transport correctly and is used to investigate the decay of grid generated turbulence in a stably stratified medium. This class of flows displays countergradient transport of the vertical turbulent heat flux. Flows with buoyancy frequencies ranging from 0 to 2.42 are calculated. The results are compared with experimental data as well as with the calculations of a constant turbulent Prandtl number model, an algebraic‐flux model and a second‐order closure. The present model is found to be capable of correctly ...