本文選題：分離渦　切入點：擬序結(jié)構(gòu)　出處：《空氣動力學學報》2016年02期

【摘要】：目前水動力學問題的數(shù)值求解仍然廣泛采用RANS模型,特別對于大尺度的地表水流的數(shù)值模擬,該類模型計算效率較高,但其難以給出湍流場的小尺度渦結(jié)構(gòu)。深入研究復雜地形條件下的水流運動,需要發(fā)展諸如LES等的高級數(shù)值模型。天然地表水流,地形、邊界復雜,雷諾數(shù)通常較高,高級數(shù)值模擬受限于計算能力的限制,還難以工程應用。RANS和LES混合模型是目前具有工程應用的一種混合數(shù)值模型,其已經(jīng)在CFD領(lǐng)域獲得了長足發(fā)展。然而對于地表水流運動的數(shù)值模擬,相關(guān)工作還較少。本文將分離渦模型(DES),即一種RANS和LES的混合模型,應用于帶自由表面的地表水流運動,建立了一套數(shù)值仿真模型。模型基于有限體積法,水平面內(nèi)采用非結(jié)構(gòu)計算網(wǎng)格,垂向為結(jié)構(gòu)化網(wǎng)格,對流項離散格式采用二階TVD格式,并行基于OpenMP語言庫。算例表明DES模型有助于揭示復雜地形條件下帶自由表面水流的大渦擬序結(jié)構(gòu)。
[Abstract]:At present, RANS model is still widely used in the numerical solution of hydrodynamic problems, especially for large-scale surface water flow numerical simulation, this kind of model is more efficient. But it is difficult to give the small scale vortex structure of turbulent field. In order to study the flow motion in complex terrain, we need to develop advanced numerical model such as LES. Natural surface water flow, topography, complex boundary, high Reynolds number, etc. The advanced numerical simulation is limited by the computational ability, and it is difficult to apply the mixed model of. Rans and LES, which is a kind of mixed numerical model with engineering application at present. It has made great progress in the field of CFD. However, there is little work on numerical simulation of surface water flow motion. In this paper, the separated vortex model, a mixed model of RANS and LES, is applied to the surface water flow motion with free surface. A set of numerical simulation models is established. The model is based on finite volume method. In the horizontal plane, the unstructured grid is used, the vertical grid is structured, and the second order TVD scheme is used for the convection term discretization scheme. The parallel model is based on the OpenMP language library. The example shows that the DES model is helpful to reveal the large vorticity quasi sequence structure with free surface flow under complex terrain conditions.
【作者單位】： 上海交通大學水動力學教育部重點實驗室;上海河口海岸科學研究中心河口海岸交通行業(yè)重點實驗室;上海交通大學船舶海洋與建筑工程學院;
【基金】：Jointly supported by the National Natural Science Foundation(No.11572196) the National Basic Research Program of China(No.2014CB046200) the Non-Profit Industry Financial Program of MWR(201401027)
【分類號】：O352
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本文編號：1687193