| 溃坝水流三维计算模型比较 |
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| 引用本文： | 郑力,钱忠东,曹志先,谈广鸣. 溃坝水流三维计算模型比较[J]. 武汉大学学报(工学版), 2009, 42(6) |
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| 作者姓名： | 郑力 钱忠东 曹志先 谈广鸣 |
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| 作者单位： | 武汉大学水资源与水电工程科学国家重点实验室,湖北武汉,430072 |
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| 基金项目： | 国家重点基础研究发展(973)计划资助项目 |
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| 摘 要： | 选取土石坝漫顶冲决过程中假定的溃口形状,采用FLOW-3D及FLUENT计算流体力学软件分别对固定溃口形状下漫坝水流进行全三维湍流数值模拟,对比研究溃坝水流的三维流动及水流对坝体的作用.结果表明,两者较为一致地反映了土石坝漫顶冲决过程中水流的流动及坝面应力分布,主要差异发生在坝体表面、水流自由液面附近以及水流掺混较为剧烈区域.理论上,FLOW-3D采用Tru-VOF方法捕捉自由液面所得水面附近结果应较为准确;FLUENT采用适应性较强的非结构化网格,所得壁面区域计算结果则更为合理.同时计算得到了较为精细的溃坝水流湍流结构和坝面壁面剪切应力分布,这将有助于深入理解大坝溃决的物理机理,进而促进溃坝洪水数学模型的发展及应用.
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| 关 键 词： | 溃坝 RNGk-ε模型 雷诺应力模型 VOF模型 |
Comparison of computed result for dam over-topping flow with two 3D models |
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| Abstract: | CFD software FLOW-3D and FLUENT are used to make a comparison study of 3D turbulent flow over-topping a breached dam.Although good agreements are shown in flow propagation and its effects on the dam surface,obvious differences still exist at the dam surface,free surface of the flow and the region with violent flow-mixing.Theoretically,FLOW-3D,which adopts Tru-VOF method,gets more accurate results than FLUENT at free surface of the flow,but FLUENT result is more reasonable near the dam surface with the use of the adaptable unstructured grid.The detailed information of turbulent flow structure and the wall shear stress on dam surface will certainly enhance the understanding of dam break mechanism,and improve the development of numerical models for dam break hydrodynamics. |
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| Keywords: | dam break RNG model Reynolds stress model VOF model |
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