CFD Modeling of Storm Sewer Geysers in Partially Filled Dropshafts
CFD Modeling of Storm Sewer Geysers in Partially Filled Dropshafts
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DOI：
10.1061/9780784484258.110
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Sumit R. Zanje;Pratik Mahyawansi;Arturo S. Leon;Cheng-Xian Lin
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文献类型：
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作者：
Sumit R. Zanje;Pratik Mahyawansi;Arturo S. Leon;Cheng-Xian Lin
雨水下水道系统中的间歇泉是由于被困空气通过落差轴不受控制地释放而产生的。本文建立了一个非定常三维计算流体力学（CFD）模型来模拟间歇泉的两相流动动力学。OpenFOAM的可压缩interfoam （CIF）求解器适合于模拟两种可压缩和不混相流体，因此在间歇泉模拟中使用了该求解器。进入降轴的空气和水的连续混合导致空气-水混合物的密度降低。此外，空气和水在液滴轴中的不均匀和混沌混合可能导致液滴轴中的小爆裂，这可能导致液滴轴中的减压。反过来，这可能会导致水平管道中大部分空气的速度和较小程度的水的速度发生快速变化。水平管内空气和水相对流速的增加，导致了层状流向波状流的转变，最终形成段塞流。这就导致了连续的喷发，这是由于鼻涕虫通过降轴喷出的结果。除了提供对间歇泉过程的深入了解外，本研究还提供了对间歇泉进行高效计算数值模拟的标准。
Geysers in storm sewer systems occur due to the uncontrolled release of trapped air through dropshafts. This study presents an unsteady three-dimensional (3D) computational fluid dynamics (CFD) model to simulate the two-phase flow dynamics of geysers starting with partially filled dropshafts. The CompressibleInterFoam (CIF) solver of OpenFOAM is used in the geyser simulations due to its suitability for modeling two compressible and immiscible fluids. The successive mixing of air and water entering the dropshaft causes a reduction in the density of the air-water mixture. Also, the non-uniform and chaotic mix of air and water in the dropshaft may lead to small bursts in the dropshaft that may cause depressurization in the dropshaft. This, in turn, could lead to rapid changes in the velocity of mostly the air and in a lesser degree of the water in the horizontal pipe. The increase in the relative velocities of air and water inside the horizontal pipe causes the transition from stratified to wavy and ultimately to slug flow. This results in successive eruptions as a result of the blowout of slugs through the dropshaft. Besides providing insights into the geyser processes, the present study provides criteria for performing a computationally efficient numerical simulation of geysers.