英语翻译If the body is in non-viscous fluid,fully submerged and

英语翻译
If the body is in non-viscous fluid,fully submerged and far from the water surface,then the body experiences no resistance.This is the Alembert's paradox.This happens because the pressure forces at the fore end of the ship opposing the motion are equal in magnitude,opposite in direction as the pressure forces at the aft end of the ship.
In a viscous fluid,a boundary layer is formed.This causes a net drag
due to skin friction.Further,because the ideal pressure now acts on the boundary layer,as opposed to the ship,and the boundary layer grows along the length of the ship,the net opposing forces are greater than the net supporting forces.This further adds to the resistance.