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粗糙裂隙流动状态数值分析
首发时间：2021-03-15
摘要：为了研究影响粗糙裂隙中流体流动状态的因素，通过控制变量法及数值模拟研究含粗糙单元单裂隙渗流规律。分别讨论了不同粗糙单元个数、位置、间距对单裂隙渗流规律的影响。最终得到结论：(1)当两个粗糙单元之间的间距变大时，涡流发生横向发展，但涡流高度一般不会超过矩形粗糙单元的高度。(2)流体通过某一粗糙单元后速度增加，距离入口最近的粗糙单元对流体流动速度场影响最大。由于粗糙单元的存在，裂隙局部隙宽减小，流体通过粗糙单元时速度增加，通过粗糙单元后速度便会下降，且通过粗糙裂隙后靠近两侧的位置流速最低。(3)在裂隙中无粗糙单元部分或粗糙单元的分布较为密集时，在相邻两个粗糙单元之间，流体会在从流入的过程中伴随压力的集中，在通过相邻的两个粗糙单元的末端后压力也会迅速减小。
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numerical analysis of flow state in rough fracture
abstract：in order to study the flow state of fluid in rough fracture and determine the influencing factors of fluid flow in fracture, the control variable method is used to study the influence of the arrangement position and spacing of rough elements in fracture on fluid flow. specifically, three kinds of rough unit number arrangement positions were compared, including one rough unit above and one rough unit below; two rough units above and two rough units below; one rough unit above and two rough units below, and two kinds of spacing were used to compare. finally, it is concluded that the fluid on the upstream surface of the lower rough unit shows more laminar flow characteristics when the flow velocity is low; when the distance between the two rough units becomes larger, the eddy current develops laterally and the area increases, and the eddy current area between the two rough units decreases and then tends to be stable.
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