Numerical Simulation of Turbulent Diffusion over Non-homogeneous Terrain
Date Issued
2006
Date
2006
Author(s)
Tsai, Tsung-Han
DOI
zh-TW
Abstract
The present study is based on a two-dimensional turbulence diffusion model, in which the passive-mixing in neutral atmosphere boundary layer is simulated. In the numerical model, two-dimensional standard k-ε turbulent model is employed to simulate the flow field. The passive transportation of water vapor passing by solid structure and permeable structures is discussed. The parameters in the present numerical model include horizontal wind velocity, vertical wind velocity, total pressure, turbulent kinetic energy, turbulent dissipation rate, turbulent viscosity, and water vapor concentration.
In the research, forest density is classified into three levels: high, medium and low. The result shows that the characteristics of flow field in high and medium dense forest are obviously different from that in low dense forest. The height of mixing layer and the aggregate value of vapor concentration grow with the forest density. Furthermore, density levels of the forest also cause different diffusion effect in the flow field.
Subjects
二維擴散
標準k-ε紊流模式
流場阻礙物
森林密度
市蓋
濃度累積量
濃度混合效率
two-dimensional turbulence diffusion
standard k-ε model
forest density
mixing layer height
diffusion efficiency
SDGs
Type
thesis
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