Stream Curve and Numerical Modeling for High-Speed Train

On the basis of analyzing streamline characteristics in potential flow field, expressing stream function by a surface and finding out the relationship between stream function surface and its borders, the concept of stream curve, a kind of function curve used for curve modeling with definite hydromechanical meanings in the joint field between Computer Graphics and Hydrodynamics, was advanced and its definition was given. Modeling methodology of stream curve by means of Ψ surface and numerical solution for the first boundary value inverse problem of Laplace´s Equation was presented and an instance was given. The result shows that the definition and the modeling method of stream curve can be used for flow-related plane curve modeling; stream curve contains physical information of flow field and the hydromechanical performance of stream curve can be approximately assessed.