The Study And Application Of Vitrual Wind Tunnel Visualization Based On RTT

Advances in computer and Computational Fluid Dynamics (CFD) techniques areallowing geometry models and fluid simulations to have ever-increasing level ofprecision and complexity. The size of data increased from previous MB to today’s GB.And it will become bigger, maybe to TB. Meanwhile, the type of data is also verycomplex. How to master these massive and complex data becomes a big problem. Ifwe don’t has an effective method to solve this problem. Then the judgment of fluidfield will become difficult and not accuracy. Modern engineering and technologyprovide us lots of information. It must through a graphical visualization process, thenwill becomes effective information. So science computing visualization has becomeone of the most important research fields of CFD.In this paper, the flow field data obtained as the starting point. First of all,discussed the type and characteristics of flow field and calculated data. This paperused triangular generation technology to mesh the flow field geometry model.Through programming realized reading and showing of model data. Meanwhile,reading the calculation data selectively.Flow field visualization can be divided into two parts, scalar visualization andvector visualization.IGES defined as the ANSI information exchange standard between differentCAD and CAM software system. In this paper, analysis the IGES standard, as theprepared work for the write of program.The vector data not only has value but also has direction. Therefore the study ofvector visualization has always been the hot point of flow field visualization.Compared and analyzed the common used vector visualization algorithms. It gave outnewly improved flow line and arrows plotting algorithms which were based on geometry shape. For the shortcomings of arrows plotting, used re-sampling of resultsdata and controlling of arrows plotting to reduce the image confusion. Through usedsecond-order Runge-Kutta integration method to extract flow line. As for the seedselection, point positioning and selecting the size of step which was involved in thisalgorithm, this paper gave out focusing study. It used the post-process system whichdeveloped by OpenGL, realized the put out of flow line data.Flow field visualization technology is an emerging field with rapidly developing.Many researchers are conducting researching work with relevant aspects oftechniques and algorithms. And there will have newly visualization techniques begenerated. Therefore, good scalability is an important factor must be considered whendesigning visualization systems. The system used object-oriented programmingtechniques. Used Visual C++6.0as the graphics programming tool, which designed agood user interface and interactive tools. So users can use the system easily.The post-process program not only has highly efficiency but also has highlyaccuracy of display. Since we have the source code, the system has a good portabilityand expanding.