In dealing with calculation of the normal polygon velocity induced by a source polygon there was a known result derived by Hess and Smith in terms of local coordinates of the polygon's corners and the point to be considered under a coordinate axis system located in the polygon.
Hess和Smith在用源汇法解三维无升力势流问题时导得了源四边形的法向诱导速度的解析表达式,其结果用设在该四边形上的局部坐标表示.