...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Fluid Flow >Numerical Study Of Dispersing Pollutant Clouds In A Built-up Environment
【24h】

Numerical Study Of Dispersing Pollutant Clouds In A Built-up Environment

机译：建筑物环境中污染物云扩散的数值研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper, we study numerically the dispersion of a passive scalar released from an instantaneous point source in a built-up (urban) environment using a Reynolds-averaged Navier-Stokes method. A nonlinear k-∈ turbulence model [Speziale, C.G., 1987. On nonlinear k-l and k-∈ models of turbulence. J. Fluid Mech., 178, 459-475] was used for the closure of the mean momentum equations. A tensor diffusivity model [Yoshizawa, A., 1985. Statistical analysis of the anisotropy of scalar diffusion in turbulent shear flows. Phys. Fluids, 28,3226-3231 ] was used for closure of the scalar transport equations. The concentration variance was also calculated from its transport equation, for which new values of Yoshizawa's closure coefficients are used, in order to account for the instantaneous tracer release and the complex geometry. A new dissipation length-scale model, required for the modelling of the dissipation rate of concentration variance, is also proposed. The numerical results for the flow, the pollutant concentration and the concentration variance, are compared with experimental data. This data was obtained from a water-channel simulation of a full-scale field experiment of tracer dispersion through a large array of building-like obstacles known as the Mock Urban Setting Trial (MUST).
机译：在本文中，我们使用雷诺平均的Navier-Stokes方法，对在建筑（城市）环境中从瞬时点源释放的无源标量的色散进行数值研究。非线性k-ε湍流模型[Speziale，C.G.，1987。关于非线性k-l和k-ε湍流模型。 J. Fluid Mech。，178，459-475]用于平均动量方程的闭合。张量扩散率模型[Yoshizawa，A.，1985年。湍流剪切流中标量扩散各向异性的统计分析。物理流体，28,3226-3231]用于标量输运方程的闭合。浓度方差也从其输运方程式中计算得出，为此使用了吉泽的闭合系数新值，以说明示踪剂的瞬时释放和复杂的几何形状。还提出了一种新的耗散长度尺度模型，该模型是对浓度方差的耗散率进行建模所必需的。将流量，污染物浓度和浓度方差的数值结果与实验数据进行了比较。该数据是通过对示踪剂通过大型建筑类障碍物（称为模拟城市环境试验（MUST））进行的大规模野外实验进行水通道模拟获得的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号