Behavior of the interaction between twin transitional round fountains in a homogeneous fluid, Part 2: Numerical study
Behavior of the interaction between twin transitional round fountains in a homogeneous fluid, Part 2: Numerical study
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DOI：
10.1016/j.ijheatmasstransfer.2015.03.026
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发表时间：
2015-07
影响因子：
5.2
通讯作者：
H. Mahmud;Wenxian Lin;Wenxian Lin;W. Gao;S. Armfield;Yinghe He
中科院分区：
文献类型：
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作者：
H. Mahmud;Wenxian Lin;Wenxian Lin;W. Gao;S. Armfield;Yinghe He
本文是我们研究均匀流体中等功率双过渡圆形喷泉相互作用行为的第二部分。在第一部分(马哈茂德等人，2015年)中，使用流动数值模拟技术和流动显示技术在1⩽Fr⩽5和25⩽Re⩽400范围内进行了实验研究，其中Re和Fr分别是雷诺数和弗劳德数。本文通过一系列的三维直接数值模拟将这项工作扩展到更广泛的范围，即1⩽Fr⩽10和25⩽Re⩽10 0 0。此外，还对三个具有代表性的案例进行了两喷泉间距影响的初步研究。结果发现，如实验研究所发现的，定常和非定常弱多峰和强多峰相互作用行为的所有主要特征都是以上下摆动和拍打运动为主的，但Fr和Re的范围更广。此外，利用数值模拟获得的喷泉最大穿透高度和相互作用区的最大厚度，与马哈茂德等人(Mahmad et al.，2015)的实验结果进行了量化，并与均匀流体中单个喷泉在可比较的Fr和Re值下的可用标度进行了比较，然后在本研究所考虑的Fr和Re范围内建立了这些参数的标度关系。
This paper is the second part of our study on the behavior of the interaction between twin transitional round fountains with equal power in a homogeneous fluid. In the first part (Mahmud et al., 2015), an experimental study using PIV techniques and flow visualization was carried out over the ranges 1⩽ Fr⩽ 5 and 25⩽ Re⩽ 400, where Re and Fr are the Reynolds and Froude numbers, respectively. In the current paper, this work is extended to wider ranges, ie, 1⩽ Fr⩽ 10 and 25⩽ Re⩽ 1000, by a series of three-dimensional direct numerical simulation (DNS). In addition, a preliminary study on the effect of the distance between the two fountain sources is also carried out for three representative cases. The DNS results are found to capture all the major features of the steady, and unsteady weakly multi-modal and strongly multi-modal interaction behavior, which is dominated by bobbing and flapping motions, as found by the experimental study (Mahmud et al., 2015), but over wider ranges of Fr and Re. Furthermore, the maximum fountain penetration height and the maximum thickness of the interaction region, obtained with the DNS, together with the experimental results of (Mahmud et al., 2015), are quantified and compared to the available scalings for single fountains in a homogeneous fluid at comparable Fr and Re values, and several scaling relations are then developed for these parameters over the ranges of Fr and Re considered in the current study.