The paper studies turbulent mixing in thermoviscous fluid flow in a 3D cubic domain which is extended periodically in two directions (X and Y). The flow turbulization develops under the impact of two-dimensional chaotic disturbances at mass average Reynolds number Re₁ = 4704. The vortex field structure is discussed in terms of an isosurface of Q-criterion and local enstrophy ζ₁. For the advanced stages of flow evolution, the study considers Eulerian correlation coefficients for velocity fluctuations (auto-correlation functions) and the cross-correlations of pressure and temperature. The Eulerian correlation coefficient is split for analysis of correlation characteristics in periodicity and wall-normal directions. The integral scale is evaluated depending on the distance to the walls. The flow analysis is performed in the terms of viscous scale. The mesh resolution is evaluated for the flow regions corresponding to the logarithmic boundary layer and the near-wall thermal layers.

中文翻译：

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非等温层中的热粘性流体流动：结构，尺度和相关性

本文研究了热粘性流体在3D立方域中的湍流混合，该域在两个方向（X和Y）上周期性地扩展。流产生涡流下二维混沌扰动的质量平均雷诺数Re的影响开发₁ = 4704的涡流场结构在的等值面来讨论Q -criterion和本地拟涡ζ ₁。对于流动演化的高级阶段，研究考虑了速度波动（自相关函数）以及压力和温度的互相关的欧拉相关系数。分裂欧拉相关系数，以分析周期性和壁法线方向的相关特性。根据与墙壁的距离评估积分比例。流量分析是根据粘性标度进行的。针对与对数边界层和近壁热层相对应的流动区域评估网格分辨率。