【摘要】：提出了一種一維淺水波與三維VOF模型耦合的明渠非恒定流數(shù)值計(jì)算方法。此方法通過建立兩個(gè)計(jì)算模型間變量的數(shù)學(xué)關(guān)系,實(shí)現(xiàn)由三維區(qū)域?yàn)橐痪S區(qū)域提供流量,一維區(qū)域?yàn)槿S區(qū)域提供壓強(qiáng)和水體體積分?jǐn)?shù)分布。用耦合方法模擬了矩形斷面渠道增、甩負(fù)荷兩種典型非恒定工況,將結(jié)果與一維淺水波模型計(jì)算結(jié)果對(duì)比,表明本方法在定性上正確,在定量上準(zhǔn)確度也較高。最后利用這一方法模擬了某水電站帶引水渠壓力前池的非恒定流現(xiàn)象,獲得了最大溢流量、最高和最低水位等重要參數(shù)。耦合方法同時(shí)結(jié)合了一維模型計(jì)算較細(xì)長明渠漸變流的效率和三維方法模擬局部明渠急變流的準(zhǔn)確性,可為分析工程中復(fù)雜的明渠流動(dòng)問題提供更優(yōu)選擇。
[Abstract]:In this paper, a numerical method of unsteady flow in open channel is presented, which is coupled with one dimensional shallow water wave and three dimensional VOF model. By establishing the mathematical relationship between the variables of the two models, the method can provide the flow rate from the three-dimensional region to the one-dimensional region, and the one-dimensional region to the three-dimensional region to provide the pressure and the distribution of the volume fraction of the water body. The coupling method is used to simulate two typical unsteady working conditions of rectangular cross-section channel increasing and load rejection. The results are compared with those of one-dimensional shallow water model. The results show that the method is correct qualitatively and has high quantitative accuracy. At last, the unsteady flow in the pressure forebay with diversion channel is simulated by this method, and some important parameters, such as maximum overflow flow, maximum water level and minimum water level, are obtained. The coupling method combines the efficiency of one-dimensional model and the accuracy of 3D method to simulate the local open channel flow, which can provide a better choice for the analysis of complex open channel flow problems in engineering.
【作者單位】： 廈門理工學(xué)院環(huán)境科學(xué)與工程學(xué)院;重慶交通大學(xué)重慶西南水運(yùn)工程科學(xué)研究所;廈門理工學(xué)院土木工程與建筑學(xué)院;
【基金】：廈門市科技計(jì)劃項(xiàng)目(3502Z20150051) 廈門理工學(xué)院高層次人才項(xiàng)目(YKJ15042R,YKJ14025R) 福建省中青年教師教育科研項(xiàng)目(JA15384) 重慶市科委自然科學(xué)基金計(jì)劃資助項(xiàng)目(cstc2016jcyj A1935) 重慶市教委自然科學(xué)基金計(jì)劃資助項(xiàng)目(KJ1600514)
【分類號(hào)】：TV133

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本文編號(hào)：2200126