基于GIS光滑粒子流体动力学改进方法仿真

Simulation on Improved Method of GIS Smoothed Particle Hydrodynamics

为了对沿海城市发生海啸进行有效分析和研究,基于光滑粒子流体动力学(SPH)3D粒子法,提出一种沿海城市爆发海啸的分析工具.首先,通过地理信息系统(GIS)得到的3D位置信息(SHP)和数字高程模型(DEM)来展示地形、海拔和建筑物的外部形态;然后,将地表轮廓定义为STL数据,将STL数据转换为粒子数据;最后,缓解SPH方法中的不可压缩条件,并利用虚拟标记处理边界问题.3D仿真表明,海啸粒子没有渗透入建筑物,在建筑物和地面之间没有间隙,验证了所提方法的有效性和良好效果.

This study proposes a tool for analyzing the tsunami outbreaks in coastal cities based on a 3D particle method of Smoothed Particle Hydrodynamics(SPH).Firstly,we obtain the 3D location information(SHP)and Digital Elevation Model(DEM)through the Geographic Information System(GIS),thus display the topography,altitude,and the outside appearance of the buildings.Then,the STL data defined by the surface profile are converted to particle data.Finally,the incompressible condition in the SPH method is alleviated,and the boundary problem is solved by virtual marking.The 3D simulations show that the tsunami particles do not penetrate into the buildings,and there is no gap between the buildings and the ground,which verifies the good results of the proposed method.