CFD非结构化网格格心格式数据高质量体绘制方法.pdfVIP

34 3 Vol. 34 No. 3 2011 3 CHINESE JOURNA L OF COMPU TERS M ar. 2011 CFD 1) 1) 2) 1) 1) 马千里 李思昆 白晓征 程志全 徐华勋 1) ( 410073) 2) ( 410073) 3D , , , , . , ( ) , , . : ; ; , Roe , . , , , . ; ; ; ; TP3 1 DOI : 10. 3724/ SP. J. 1016. 2011.00508 HighQuality Volume Rendering of UnstructuredGrid CellCentered Data in CFD 1) 1) 2) 1) 1) MA QianLi LI SiKun BAI XiaoZheng CHENG ZhiQuan XU HuaXun 1) ( Sc hool of Comp ut er S ci ence , N at ional Univ ers i ty of D ef en se T echn ol og y , Chang sh a 410073) 2) ( Coll eg e of A erosp ace and M ate ri al En gi neeri ng , N ati onal Unive rs i ty of D ef ense T echnol og y , Ch angsha 410073) Abstract 3D unstructuredgrid cellcentered data are commonly produced by the recent numeri cal simulations. For visualization, existing approaches usually preextrapolate cellcentered data into cellvertexed data, which depress the rendering accuracy and the image quality. This paper proposes to do direct sampling for these cellcentered data avoiding extrapolation on the frame w ork of multipass raycasting . During sampling, the w hole computing w ork is done using the original data leading to a high rendering accuracy. T he field at a sample is reconstructed by the cellcentered data and the cellgradient. A cellgradient is w ell estimated by the GreenGauss theorem w ith the aid of faceflux construction. Considering the relationship among the flow vari ables, this paper constructs the faceflux by the Roeave