摘要: Publisher Summary Waves follow a moving ship and the propagation of these waves is associated with presence gravitational field. Water endowed viscosity, anybody through viscous fluid, experiences resistance, partly because tangentially acting stresses on body, but also boundary-layer growth, separation, if it occurs, yield resistance resulting from integrating normal components stress over body. The frictional will certainly depend upon wave profile along ship. On other hand, pattern itself going to in some fashion ship's boundary layer wake. effects gravity viscosity interact essential ways. There seems be no neat practicable definition or without introducing assumptions approximations.