数值计算数据的流动显示模拟

THE OPTICAL FLOW VISUALIZATION SIMULATION OF COMPUTATIONAL DATA

在风洞试验中，光学流动显示技术是揭示流场特性的重要手段，为了把数值计算数据与流场显示结果进行直接比较，利用可视化技术把数值计算数据转化成阴影、纹影和马赫干涉条纹图像。首先根据有关研究结果和平面流动的特点，导出适于产生计算流场图像的关系式，重新计算流场数据，然后将导出的数据进行颜色编码。为了使图像效果良好、图像生成速度快，还介绍了一种自行设计的，时空效率较高的颜色编码算法。

When a ray of light passes through the experiment enviroment, the air density varying leads to the gas refractivity changing, thus people often apply optical flow visualization to wind tunnel experiment. To compare computational data with optical flow visualization results directly, in this paper, we have discussed one method to produce flow images from computational data, which are included shadowgraph,schliren and interferometry. According to some researches, we have derived the relecant simple formulae from the three original mathmatical models in the 2-D case, computed the flow data again, and color-coded with 256 klnds of white and black cotor. In order to obtain high quality images quickly, we have also presented one kind of color coding algorithm.