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首页> 外文期刊>Computers & Fluids >Eduction of near wall flow structures responsible for large deviations of the momentum-heat transfer analogy and fluctuations of wall transfer rates in turbulent channel flow
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Eduction of near wall flow structures responsible for large deviations of the momentum-heat transfer analogy and fluctuations of wall transfer rates in turbulent channel flow

机译：对动量传热类比的大偏差和湍流通道流动中壁传递速率的波动负责的近壁流动结构的教育

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摘要

In this paper we analyze the flow structures responsible for large local instantaneous deviations of the conventional momentum-heat transfer analogy and large fluctuations of the wall shear stress and the wall heat flux in a forced convection turbulent channel flow at low-Reynolds numbers (Re = 4.570, Pr = 0.7). The analysis was carried out using a database obtained from a direct numerical simulation performed with a second-order finite volume code. The ensemble averaged velocity and temperature profiles and profiles of the turbulence intensities and turbulent heat fluxes agree well with direct numerical simulations available in the literature. When the flow was statistically fully developed, we recorded the time evolution of the velocities and temperatures near one wall of the channel. The near wall structures responsible for the extreme values of the deviations were educed by a conditional sampling technique. Results show that extreme values of the wall shear stress and wall heat transfer rates, as well as departures from the conventional analogy between momentum and heat transfer, occur within the high-speed streaks on the wall and are associated with fluctuations of the streamwise pressure gradient. These large fluctuations on the wall are produced by the combined effect of two quasi-parallel counterrotating streamwise vortices.
机译：在本文中，我们分析了在低雷诺数下强迫对流湍流通道中常规动量-热传递类比的局部瞬时瞬时大偏差以及壁面剪应力和壁热通量的较大波动的流动结构。 4.570，Pr ＝ 0.7）。使用从使用二阶有限体积代码进行的直接数值模拟获得的数据库进行分析。整体平均速度和温度分布图以及湍流强度和湍流通量的分布图与文献中提供的直接数值模拟非常吻合。当流量在统计上完全展开时，我们记录了通道一壁附近的速度和温度的时间演化。通过条件采样技术得出了导致偏差极值的近壁结构。结果表明，墙体的高速条纹中出现墙体剪应力和墙体传热速率的极值，以及动量和传热之间的传统类比偏离，并与流向压力梯度的波动有关。 。壁上的这些大波动是由两个准平行的逆向旋转涡流共同作用产生的。

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