• 作者： Pai, Prasad; Tsang, T.H.
• 中文摘要： 一個二階紊流模式被使用來模擬對流邊界層內汙染分散的羽狀行為。並使用一快速有限元素法來解偏微方程組。此二階模式不僅可以解釋羽狀的提昇和下降行為,而且和最近實驗室的發現及大渦流模擬(LES)非常吻合。本文亦將二階模式和一般使用的渦流擴散或K-擴散模式在同一氣象狀況下比較,快速有限元素法大約比K-擴散模式需要2.5-7.6倍的CPU時間。
• 英文摘要： A second-order closure turbulence model is used to simulate the plume behavior of a passive contaminant dispersed in a convective boundary layer. A time-splitting finite element scheme is used to solve the set of partial differential equations. The second-order closure model can describe the plume "lift off" and "descending" behavior and agrees with recent findings from laboratories and Large Eddy Simulations (LES). We also compare the second-order closure model with the commonly used eddy diffusivity or K-diffusion model for the same meteorological conditions. The time-splitting finite element scheme requires about 2.5 to 7.6 times the CPU time used by the K-diffusion model.
• 中文關鍵字： 空氣污染模式; 紊流擴散; 對流邊界層; 二階; 快速有限元素
• 英文關鍵字： Air Pollution Modeling; Turbulent Diffusion; Convective Boundary Layer; Second-Order Closure; Time-Splitting Finite Element