基于OpenFOAM软件确定动能和动量修正系数的复合通道数值模拟

Q4 Environmental Science
Nariman Mehranfar, Elham Ghanbari-Adivi
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引用次数: 0

摘要

摘要复合河道各断面及主河道-河漫滩界面区域流速分布的不均匀性,导致水面剖面估算、洪水走向、污染转移等方面存在误差。为了减少非均匀性对精确计算动能和动量的影响,分别采用了α和β修正系数。然而,这些系数的确定方法是河流工程中一个具有挑战性的问题。本研究使用OpenFOAM软件对已有数据的两种复合明渠实验室模型进行数值计算,使用单相pimpleFoam求解器在该软件中进行建模,使用k ω sst湍流模型计算流动特性。根据结果,软件估计的结果与实验室实验结果之间的最大差异(13%)出现在水流深度较低的地方,水流离开主河道,进入深度很浅的洪泛平原,可能是由于该区域的网格生成。该差异随着流动深度的增加而减小,α系数的平均值为6.65%,β系数的平均值为2.32%,说明数值模拟结果与实验数据吻合较好,说明OpenFOAM软件可以成功地用于复合流道的流动建模和流动特性分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Modeling of Compound Channels for Determining Kinetic Energy and Momentum Correction Coefficients Using the OpenFOAM Software
Abstract The non-uniformity of the flow velocity distribution in each section of compound channels and in the main channel-floodplain interface area causes errors in estimating water surface profile, flood routing, pollution transfer, and so on. To reduce the impacts of non-uniformity on the exact calculation of kinetic energy and momentum, α and β correction coefficients are used, respectively. However, the determination method of these coefficients is a challenging issue in river engineering. This study used the OpenFOAM Software to determine these coefficients numerically for two laboratory models of compound open channels of which the data are available, using the single-phase pimpleFoam solver to do modeling in the mentioned software and the k-ωSST turbulence model to calculate the flow characteristics. Based on the results, the highest difference (13%) between the results estimated by the software and those obtained from the lab experiments was seen in the low flow depth where the flow left the main channel and entered the floodplain of a very shallow depth, possibly due to the grid generation of this area. This difference decreased as the flow depth increased, and its average was 6.65% for α coefficient and 2.32% for β coefficient in all cases, which means the results of numerical modeling and the experimental data conformed well, and the OpenFOAM software can be successfully used in flow modeling and analyzing flow characteristics in compound channels.
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来源期刊
Archives of Hydroengineering and Environmental Mechanics
Archives of Hydroengineering and Environmental Mechanics Environmental Science-Water Science and Technology
CiteScore
1.30
自引率
0.00%
发文量
4
期刊介绍: Archives of Hydro-Engineering and Environmental Mechanics cover the broad area of disciplines related to hydro-engineering, including: hydrodynamics and hydraulics of inlands and sea waters, hydrology, hydroelasticity, ground-water hydraulics, water contamination, coastal engineering, geotechnical engineering, geomechanics, structural mechanics, etc. The main objective of Archives of Hydro-Engineering and Environmental Mechanics is to provide an up-to-date reference to the engineers and scientists engaged in the applications of mechanics to the analysis of various phenomena appearing in the natural environment.
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