Study On Streamline Numerical Arithmetic In Simulation Of Groundwater Visualization

Streamline construction is a technique for flow visualization, which is a hotspot of Fluid Dynamics. It is formed by the Scientific Visualization and Finite EIement Method, This paper sumed up the character of grounderwater flow and data, and summarized the current status of Visualization of streamline.By the way of Finite EIement Method, through Interpolation of basis function, a successful program was finished. In the Algorithm of 3D grounderwater Visualization, a mathd of tetrahedral basis fuction was used to find the positon quickly, which include the numerical integration of Runge-Kutta Method and adaptive step. To avoid the conversion from physicalspace to computational space, a fast point location algorithmfor constructing streamline based on the normal of tetrahedron was proposed by dividing the curvilinear grids of CFD computation into tetrahedrons and the data structure was adopted to set the topological relationship among the tetrahedrons. An adaptive step was also used for fasten the numerical integration process. The presented method was demonstrated to be able to construct streamlines in a physical space directly, with improved efficiency and precision of streamline constructing.The 2D model of streamline and the definiens of streamline is the keystone to understand the paper. At last the paper presented a new mathed of velocity interpolation by the enlightenment of streamline of 3D grounderwater Visualization.