Numerical visualisation on applying a five-stage multi-scaled square turbulence-generating grid to generating turbulence
Numerical visualisation on applying a five-stage multi-scaled square turbulence-generating grid to generating turbulence
复制标题
DOI：
10.1088/1742-6596/2313/1/012005
复制
发表时间：
2022-07
期刊：
影响因子：
--
通讯作者：
H. Suzuki
中科院分区：
文献类型：
--
作者：
H. Suzuki
本文研究了由五阶方形多尺度湍流网格产生的湍流的数值可视化。与以往使用多级湍流网格的研究不同，本研究将湍流网格的级数增加到5级。对于目前的数值可视化，在此分析中使用直接数值分析。本分析采用了高阶中心差分格式和三阶龙格-库塔格式。除了多尺度五阶湍流网格外，本文还涵盖了两个四阶湍流网格供参考。利用控制方程中的外力项，在计算域内形成了当前的多尺度湍流网格。本文探讨了下游湍流场的空间均匀性。四级湍流网格产生的湍流在下游区域表现为甜甜圈状瞬时速度图的流动结构。通过对流向瞬时速度等高线图的考察，本研究发现，增加湍流网格级数可以改善下游湍流场的空间均匀性。
This study presents the numerical visualisation of turbulence generated by a five-stage square-type multi-scale turbulence grid. The present study applies a turbulence grid with an increased number of stages to five, in contrast to previous studies using multi-scale turbulence grids with four stages. For the present numerical visualisation, direct numerical analysis is used in this analysis. This analysis uses the high-order central difference schemes and the third-order Runge-Kutta scheme. In addition to the multi-scale turbulence grid with five stages, the present study also covers two turbulence grids with four stages for reference. By using the external force term in the governing equations, the present multi-scale turbulence grids were formed numerically in the computational domain. The spatial homogeneity of the downstream turbulence field is approached in this work. The turbulence generated by the turbulence grids with four stages is characterised by a flow structure with a doughnut-like instantaneous velocity figure in the downstream region. By examining contour diagrams of the streamwise instantaneous velocity, the present study can see that the spatial homogeneity of the turbulence field downstream is improved by increasing the number of stages for the turbulence grid.