权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of a numerical analysis system of wind field over complex terrain

复杂地形风场数值分析系统的研制

基本信息

批准号：
10555336
负责人：
OHYA Yuji
金额：
$ 4.03万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

The objectives of the present research are to develop a numerical and experimental method to predict the wind environment over complex terrain. For the numerical method, we have focused on the development of grid generation method for complex terrain, a method for computing high Reynolds number flows, such as LES, and a technique for boundary conditions for the inlet and ground. As the results, we have successfully developed a method for grid generation, by using a rectangular grid approximation technique, which enable us to generate a computational grid easily and effectively. This method will be very useful in a new feature, because the computer ability will develop year by year. A LES method has been employed to simulate high Reynolds number flows. Among turbulence models, LES is a most hopeful method for the simulation turbulence field. For the boundary conditions, to give suitable turbulent conditions at the entrance of the computer domain, we have adopted a pre-domain method to compute the turbulent inflows. For the wind tunnel experiment, mean-velocity measurement and flow visualization experiment of the flow over complex terrain was carried out to compare the results with those in numerical analyses. Both results show almost good agreement except for the region near ground.To sum up, although there still remain a couple of problems both in numerical and experimental method for the prediction of wind environment over complex terrain, a system consisting of the numerical analysis and wind tunnel experiment has been successfully developed.

本研究的目的是建立一种预测复杂地形上风环境的数值和实验方法。在数值方法方面，我们重点发展了复杂地形的网格生成方法，高雷诺数流的计算方法，如LES，以及入口和地面边界条件的技术。因此，我们成功地开发了一种网格生成方法，通过使用矩形网格近似技术，使我们能够轻松有效地生成计算网格。这种方法将非常有用，在一个新的功能，因为计算机的能力将逐年发展。采用LES方法模拟了高雷诺数流动。在湍流模型中，LES是一种最有希望模拟湍流场的方法。对于边界条件，为了在计算机域的入口给出合适的湍流条件，我们采用了预域方法来计算湍流流入。在风洞实验中，进行了复杂地形上气流的平均速度测量和流动可视化实验，并与数值分析结果进行了比较。除近地面区域外，两者结果基本一致。综上所述，虽然复杂地形风环境的数值和实验预测方法还存在一些问题，但我们已经成功地建立了一个由数值分析和风洞实验组成的系统。