| 袁丽蓉,沈永明,唐军.波流环境中污染物混合的分析[J].水利学报,2007,38(3):260-266 |
| 波流环境中污染物混合的分析 |
| Analysis on the mixing of pollutants in water current combining with waves |
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| DOI： |
| 中文关键词: 混合 波流 紊流模型 VOF方法 污染物浓度 |
| 英文关键词: mixing wave combining with current turbulence model VOF method pollutant concentration |
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| 中文摘要: |
| 本文根据垂向二维数值模型计算求解和分析了波流环境中的一维对流扩散方程中的混合系数。此二维数值模型采用非线性k-ε紊流模型封闭雷诺时均方程，应用VOF方法处理自由面。分析方法是用该二维模型计算波流环境中污染物瞬时源产生的浓度场，计算该浓度场的断面平均浓度，求此断面平均浓度的概率分布，由概率分布的方差随时间的导数得到一维对流扩散问题中的混合系数。通过算例分析，发现波流环境混合系数随着波浪周期和波 高的不同，可能大于纯流和纯波的混合系数之和，也可能比纯流情况下小；波周期与混合系数呈正比。且存在一个使混合系数最大的波高。 |
| 英文摘要: |
| The nonlinear k-εturbulence model and VOF method is combined to numerically solve the vertical 2 D time average equation for pollution transportation. By using this method the spatial distribution and temporal variation of velocity field, diffusion coefficient and pollution concentration distribution due to waves, current or the combination of wave and current can be solved. The probability distribution of average pollutant concentration in cross section under the condition of current combining with waves is calculated based on the instant distribution of pollutants. The mixing coefficient for 1 D calculation is deduced from the derivative of variance of probability distribution. The calculation
example shows that under the condition of current combining with waves the mixing coefficient varies with the period and height of waves and will larger than the sum of the mixing coefficients corresponding to the cases only current flow or only waves is existed. The mixing coefficient is positively proportion to wave period and a maximum related to wave height may exist. |
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