Constructing streamlines in 3D CFD flow field

To avoid the conversion from physical space to computational space, a fast point location algorithm for constructing streamline based on the normal of tetrahedron was proposed by dividing the curvilinear grids of CFD computation into tetrahedrons and the wing patch data structure was adopted to set the topological relationship among the tetrahedrons. An adaptive step was also used to 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.