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題名 | On Second-Order Closure Modeling of Turbulent Diffusion in a Convective Boundary Layer= |
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作者 | 曾達珩; Pai,Prasad; |
期刊 | Journal of the Chinese Institute of Chemical Engineers |
出版日期 | 19890900 |
卷期 | 20:5 1989.09[民78.09] |
頁次 | 頁297-306 |
分類號 | 460.02 |
語文 | eng |
關鍵詞 | |
英文摘要 | A second-order closure turbulence model is used to simulate the plume behavior of a passive contaminate 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 aggress 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. |
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