流场实景可视化在水运工程中的应用研究

在水运工程水动力数值模拟可视化中融入地理实景,能丰富视景信息,达到直观显示的目的。文章以Google地球软件(Google earth)作为虚拟场景的图形平台,对二维水动力数值计算流场进行动画仿真,实现了对数模计算成果的实景可视化。为实现实景可视化,首先要获取Google地球软件的视图窗口句柄,用Windows API通过自编程序对Google地球软件进行控制,然后在特定视角下既有的地理要素中融入实测地形图,依顺序在虚拟场景中分层绘制并显示逐时刻流场矢量图,从而实现流场动画。采用对局部屏幕图像截取方法获得不同时刻流场图像,将不同时刻的图像文件作为关键帧压缩编码生成动态影像文件。以实际人工岛建设工程项目为例,展示了实景动画可视化显示效果。

Application of flow visualization with real-scene in water transportation engineering

It can enrich the visual information and achieve the purpose of intuitive displaying by integrating GIS into the visualization of hydrodynamic simulation of water transport engineering.In this paper,Google earth software(Google earth)was used as the graphics platform of the virtual scene to simulate the flow field of 2D hydrodynamic model and realize the real-scene visualization to the simulation data.In order to achieve real-scene visualization,the view window handle of Google earth was obtained firstly,and Google earth was controlled with windows APIs by the self-programming software,then the measured topographic map was integrated into the based existing geographical elements in a specific perspective,and vector diagrams of flow field were drawn and displayed by layers in the virtual scene orderly.The partial screen image capture method was used to obtain vector diagrams of flow field at different times,and the image files were compressed and encoded as key frames into a video file in sequence.Taking the actual artificial island construction project as an example,the visualization of real scene simulation was demonstrated.