论文标题
平面couette湍流中湍流磁通的运输预算的光谱分析
Spectral analysis on transport budgets of turbulent heat fluxes in plane Couette turbulence
论文作者
论文摘要
近年来，已经对壁湍流中的逐一能量传输进行了深入研究，并且已经研究了湍流能量的复杂空间和规模转移。由于从工程的角度来看，热传递的增强是湍流最重要的方面之一，因此研究如何通过在壁湍流中的非线性多规模相互作用以及湍流能量来研究湍流热通量如何在太空和规模上运输。在本研究中，根据具有无源标量热传递的湍流平面库特流量的直接数值模拟数据研究了湍流热通量的光谱传输预算。与相应的雷诺应激光谱相比，研究了温度波动和速度温度相关性的跨度光谱的运输预算。讨论了这些规模运输的相似性和差异，特别关注尺度运输和空间湍流扩散的作用。结果，发现与温度相关统计的光谱传输与雷诺应力的光谱传输非常相似，尤其是在整个通道中通常都在整个通道中都观察到雷诺的转移雷诺的剪切应力和壁正常的湍流热通量
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 inverse interscale transfer is commonly observed throughout the channel in both transport of the Reynolds shear stress and wall-normal turbulent heat flux
