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首页> 外文期刊>International Journal of Heat and Mass Transfer >Large eddy simulation of stably stratified turbulent open channel flows with low- to high-Prandtl number
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Large eddy simulation of stably stratified turbulent open channel flows with low- to high-Prandtl number

机译：从低到高普朗特数的稳定分层湍流明渠流的大涡模拟

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摘要

Large eddy simulation of thermally stratified turbulent open channel flows with low- to high-Prandtl number is performed. The three-dimensional filtered Navier-Stokes and energy equations under the Boussinesq approximation are numerically solved using a fractional-step method. Dynamic subgrid-scale (SGS) models for the turbulent SGS stress and heat flux are employed to close the governing equations. The objective of this study is to reveal the effects of both the Prandtl number (Pr) and Richardson (Ri_ τ) number on the characteristics of turbulent flow, heat transfer, and large-scale motions in weakly stratified turbulence. The stably stratified turbulent open channel flows are calculated for Pr from 0.1 up to 100, Ri_ τ from 0 to 20, and the Reynolds number (Re_ τ) 180 based on the wall friction velocity and the channel height. To elucidate the turbulent flow and heat transfer behaviors, some typical quantities, including the mean velocity, temperature and their fluctuations, turbulent heat fluxes, and the structures of the velocity and temperature fluctuations, are analyzed.
机译：对低至高Prandtl数的热分层湍流明渠流进行了大涡模拟。使用分数步法数值求解在Boussinesq近似下的三维滤波Navier-Stokes和能量方程。针对湍流SGS应力和热通量的动态亚网格规模（SGS）模型被用来关闭控制方程。这项研究的目的是揭示普朗特数（Pr）和理查森（Ri_τ）数对弱分层湍流中湍流，传热和大规模运动特征的影响。根据壁摩擦速度和通道高度，计算出从0.1到100的Pr，从0到20的Ri_τ和雷诺数（Re_τ）180的稳定分层湍流明渠流量。为了阐明湍流和传热行为，分析了一些典型量，包括平均速度，温度及其波动，湍流热通量以及速度和温度波动的结构。

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