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| Numerical modeling of atmospheric flow and dispersion around a mountain |
| Revised:June 30, 2005 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20074093 |
| KeyWord:numerical modeling,stratified flow,atmospheric flow around a mountain,pollutant dispersion |
| LI Ling KIMURA Shigeo |
| 1. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China 2. Institute of Nature and Environmental Technology, Kanazawa University Kanazawa 920-8667, Japan |
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| Abstract: |
| A series of numerical experiments had been conducted to investigate the flow patterns and dispersion characteristics around a mountain under stably stratified flow.The two-dimensional model equations,based on the time-dependent Reynolds averaged Navier-Stokes equations,were solved numerically using an implicit time integration in body-fitted grid arrangement.The behavior of the flow is clarified to ascertain the effects of changes in the stratification,which is characterized by the Froude number F=U/NH(Where U is speed of the approaching wind,N is the Brunt-Vaisala frequency,and H is the mountain height). The numerical results suggest that the flow structure is independent of stratification when F>4.0.The model predicts lee wave generation as the Froude number is decreased from 4 to 1,then flow splitting,wave breaking phenomena happen as F is further decreased to less than 1.0.Further,the model-predicted concentration fields when the contaminant is coming with the approaching wind show that the stratification of atmospheric flow has significant effects on the dispersion pattern. |
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