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首页> 外文期刊>International Journal of Heat and Mass Transfer >Large eddy simulation of a thermally stratified turbulent channel flow with temperature oscillation on the wall
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Large eddy simulation of a thermally stratified turbulent channel flow with temperature oscillation on the wall

机译：壁上温度振荡的热分层湍流通道的大涡模拟

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摘要

Thermally stratified turbulent channel flow with temperature oscillation on the bottom wall of the channel is investigated by use of large eddy simulation (LES) approach coupled with dynamic subgrid-scale (SGS) models. The objective of this study is to deal with the influence of the temperature oscillation on characteristics of thermally stratified turbulent flow and to examine the effectiveness of the LES technique on predicting unsteady turbulent flow driven by time-varying buoyancy force. To validate the present calculation, thermally stratified turbulent channel flow is computed and compared with available data obtained by direct numerical simulation (DNS), which confirm that the present approach can be used to study stably and unstably stratified turbulent flow satisfactorily. Further, to elucidate the effect of the temperature oscillation on turbulent flow with different Richardson numbers and oscillation periods, some statistical quantities including the phase-averaged resolved velocities, temperature and their fluctuations, turbulent heat fluxes, and turbulence structures based on instantaneous velocity and temperature fluctuations are analyzed.
机译：通过使用大型涡模拟（LES）方法和动态亚网格规模（SGS）模型，研究了通道底壁上具有温度振荡的热分层湍流通道。这项研究的目的是处理温度振荡对热分层湍流特性的影响，并检验LES技术在预测随时间变化的浮力驱动的不稳定湍流中的有效性。为了验证本计算结果，计算了热分层湍流流并将其与通过直接数值模拟（DNS）获得的可用数据进行比较，这证实了本方法可用于令人满意地研究稳定和不稳定分层湍流。此外，为了阐明温度振荡对具有不同理查森数和振荡周期的湍流的影响，根据瞬时速度和温度，一些统计量包括相平均分辨速度，温度及其波动，湍流和通量结构。分析波动。

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