John C. Chien

January 29, 1999 15:51 
Re: 3D characteristc methods
2D and 3D method of characteristics have been used in external flow, internal flow and aerodynamic testing for many years. Mehtod of characteristic is an exact method. It can be implemented using graphic method or numerical method. The limitation is: it is not for subsonic flow. The method of characteristics has been used to guide the design of more accurate and advanced schemes for solving the Euler equations. ( Numerical methods for Euler equations are approximate in nature, and the shock is captured in an approximate sense. Numerical solutions of Euler equations are not truely inviscid, because of the viscous effect created by the numerical diffusion or added artificial diffusion terms.) Thinking about reinventing the wheel? It may not be a bad idea after all. Things are being reinvented all the time. ( I think 'CFD mechanics' was invented by the old generation for the people in the computer age.)
