''' The surface can move with the fluid and so must be found as part of the solution '''; How can consider the surface as part of solution?! this topic is depends on flowing of fluid with free surface perturbed by an obstacle.
''' The surface can move with the fluid and so must be found as part of the solution '''; How can consider the surface as part of solution?! this topic is depends on flowing of fluid with free surface perturbed by an obstacle.