风场数值模拟中复杂地形的NURBS建模

Complex Terrain Surface Modeling with NURBS Technique for Wind Field Numerical Simulation

引入NURBS(Non-uniform Rational Basis Spline)曲面建模技术,并基于数字高程模型(Digital Elevation Model,DEM)提出一种风场数值模拟中复杂地形的建模方法。通过对地理信息处理系统(GIS)共享数据处理,得到相关地形的DEM信息,进而通过编写程序利用NURBS技术形成模拟真实地形形态的地面网格。实例研究表明,该方法建模流程清晰简捷,不仅结合了NURBS技术在复杂曲面构建方面的优点,而且基于GIS数据库提取真实地形的DEM信息,能够更好地处理风场数值模拟中复杂地形的建模问题。

Based on NURBS （Non-uniform rational Basis Spline） technique and digital elevation model （DEM）, a new complex terrain surface modeling approach with application to wind field numerical simulation was presented. The DEM information of complex terrain region was obtained by transforming the shared geographic information system （GIS） da-ta. Then, the real complex terrain ground grid was created based on NURBS technique by compiling program. A case study indicates that the modeling procedure of this method is clear and simple, and it combines the advantages of the NURBS technique and DEM in the complex surface modeling , could provide a better way to deal with the complex terrain surface modeling for wind field numerical simulation.