Spectral Analysis on Transport Budgets of Turbulent Heat Fluxes in Plane Couette Turbulence
Spectral Analysis on Transport Budgets of Turbulent Heat Fluxes in Plane Couette Turbulence
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DOI：
10.3390/en15145258
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发表时间：
2022-05
期刊：
影响因子：
3.2
通讯作者：
T. Kawata;T. Tsukahara
中科院分区：
文献类型：
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作者：
T. Kawata;T. Tsukahara
近年来，人们对壁面湍流的逐尺度能量传递进行了深入的研究，并对湍流能量的复杂空间和尺度间传递进行了研究。从工程的角度来看，增强传热是湍流的重要方面之一，因此研究湍流热流如何通过壁面湍流和湍流能量的非线性多尺度相互作用在空间和尺度上传递也很重要。本文基于具有被动标量传热的湍流平面Couette流的直接数值模拟数据，研究了湍流热通量的谱输运收支。与相应的雷诺应力谱相比，详细研究了温度波动和速度-温度相关的跨展谱的输运预算。讨论了这些尺度间输运的异同，重点讨论了尺度间输运和空间湍流扩散的作用。结果表明，温度相关统计量的谱输运与雷诺数应力的谱输运非常相似，特别是在雷诺数剪切应力和壁面法向湍流热通量的输运中，在整个通道中普遍存在逆尺度间输运。
In recent years, scale-by-scale energy transport in wall turbulence has been intensively studied, and the complex spatial and interscale transfer of turbulent energy has been investigated. As the enhancement of heat transfer is one of the most important aspects of turbulence from an engineering perspective, it is also important to study how turbulent heat fluxes are transported in space and in scale by nonlinear multi-scale interactions in wall turbulence as well as turbulent energy. In the present study, the spectral transport budgets of turbulent heat fluxes are investigated based on direct numerical simulation data of a turbulent plane Couette flow with a passive scalar heat transfer. The transport budgets of spanwise spectra of temperature fluctuation and velocity-temperature correlations are investigated in detail in comparison to those of the corresponding Reynolds stress spectra. The similarity and difference between those scale-by-scale transports are discussed, with a particular focus on the roles of interscale transport and spatial turbulent diffusion. As a result, it is found that the spectral transport of the temperature-related statistics is quite similar to those of the Reynolds stresses, and in particular, the inverse interscale transfer is commonly observed throughout the channel in both transport of the Reynolds shear stress and wall-normal turbulent heat flux.