| Numerical Simulation on Stratified Flow over an Isolated Mountain Ridge |
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| 作者姓名： | 李玲 Shigeo Kimura |
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| 作者单位： | State Key Laboratory of Hydroscience and Engineering Department of Hydraulic Engineering，Tsinghua University，Institute of Nature and Environmental Technology，Kanazawa University，Kanazawa 920-8667，Japan，Beijing 100084，China |
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| 基金项目： | the Scientific Foundation for Returned Overseas Chinese Scholars, Ministry of Education of China |
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| 摘 要： | The characteristics of stratified flow over an isolated mountain ridge have been investigated nu-merically. The two-dimensional model equations, based on the time-dependent Reynolds averaged Navier-Stokes equations, are solved numerically using an implicit time integration in a fitted body grid arrangement to simulate stratified flow over an isolated ideally bell-shaped mountain. The simulation results are in good agreement with the existing corresponding analytical and approximate solutions. It is shown that for atmos-pheric conditions where non-hydrostatic effects become dominant, the model is able to reproduce typical flow features. The dispersion characteristics of gaseous pollutants in the stratified flow have also been stud-ied. The dispersion patterns for two typical atmospheric conditions are compared. The results show that the presence of a gravity wave causes vertical stratification of the pollutant concentration and affects the diffu-sive characteristics of the pollutants.
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| 关 键 词： | 数字模拟 重力波 山脉 地形 |
| 收稿时间： | 20 May 2006 |
| 修稿时间： | 2006-05-202006-10-20 |
Numerical Simulation on Stratified Flow over an Isolated Mountain Ridge |
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| Ling Li, ,Shigeo Kimura.Numerical Simulation on Stratified Flow over an Isolated Mountain Ridge[J].Tsinghua Science and Technology,2007,12(3):332-336. |
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| Authors: | Ling Li Shigeo Kimura |
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| Institution: | 1.State Key Laboratory of Hydroscience and Engineering, 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: | The characteristics of stratified flow over an isolated mountain ridge have been investigated nu-merically. The two-dimensional model equations, based on the time-dependent Reynolds averaged Navier-Stokes equations, are solved numerically using an implicit time integration in a fitted body grid arrangement to simulate stratified flow over an isolated ideally bell-shaped mountain. The simulation results are in good agreement with the existing corresponding analytical and approximate solutions. It is shown that for atmos-pheric conditions where non-hydrostatic effects become dominant, the model is able to reproduce typical flow features. The dispersion characteristics of gaseous pollutants in the stratified flow have also been stud-ied. The dispersion patterns for two typical atmospheric conditions are compared. The results show that the presence of a gravity wave causes vertical stratification of the pollutant concentration and affects the diffu-sive characteristics of the pollutants. |
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| Keywords: | internal gravity wave stratified flow complex topography numerical method |
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