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Numerical simulation of the flow within and over an intersection model with Reynolds-averaged Navier-Stokes method 总被引:2,自引:0,他引:2 下载免费PDF全文
In this study, the Reynolds-averaged Navier-Stokes (RANS) method is employed to simulate the flow within and over an intersection model with three kinds of k-ε turbulence closure schemes, namely, standard model, renormalization group (RNG) model and realizable k-ε model. The comparison between the simulated and observed flow fields shows that the RANS simulation with all the three turbulence models cannot completely and accurately reproduce the observed flow field in all details. A detailed comparison between the predicted profiles of wind velocities and the measured data shows that the realizble k-ε model is the best one among the three turbulence closure models in general. However, the extent to which the improvement is achieved by the realizable k-ε model is still not enough to completely and accurately describe the turbulent flow in a relatively complex environment. 相似文献
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复杂地形网格生成研究 总被引:6,自引:0,他引:6
在研究羽流扩散的过程中,根据实验中提供的复杂地形数据,采用一系列的格式转化,将其变为流体力学计算软件Fluent和其建模软件Gambit能够读取的数据,并生成相应的计算网格,为计算复杂地形上的羽流扩散创造了条件。 相似文献
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The application of computational fluid dynamics to pedestrian level wind safety problem induced by high-rise buildings 总被引:4,自引:0,他引:4 下载免费PDF全文
In this paper, the pedestrian level wind safety problem induced by high-rise buildings has been studied using the computational fluid dynamics (CFD) codes Fluent. The verification by use of wind tunnel data shows that Fluent can fairly reproduce the flow field in the areas adjacent to the structure when a realizable k-ε turbulence model is adopted in calculations. The results of the numerical simulations including seven cases show that the existence of high-rise buildings does increase the wind hazard probability at the pedestrian level; furthermore, the wind direction, the geometric size of structures and the layout of structures can obviously affect the pedestrian level wind environment. However, trees on the pavement do not contribute much in reducing the wind hazard probability. 相似文献
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大气边界层内羽流扩散研究 总被引:5,自引:0,他引:5
主要研究了高架点源的污染,即``羽流扩散'. 由于大气边界层内的湍流运动,引
起污染物扩散的主要因素是湍流扩散,
研究湍流扩散有两种基本方法:统计理论和梯度理论. 采用拉格朗日粒子扩散模型
(Lagrangian particle dispersion model,
LPDM)来评价羽流扩散的平均浓度,分别计算了表征扩散程度的3个参数:沿烟轴方向的
着地浓度、水平方向的羽流扩散宽度和垂直方向的羽流扩散宽度. 从计算结果和风洞实验的
数据对比来看,用该模式可以较好地模拟大气边界层内复杂气候条件下的羽流扩散. 相似文献
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