3 ms·
Why do they need to be at higher or lower pressure? That doesn't explain anything.
by simonh 6y ago
Why do they need to be at higher or lower pressure? That doesn't explain anything.
- bopbeepboop 6y agoThe ship is moving. The bow moves water out of the way when it moves forward and the stern vacates space which the water fills. So water is going away from the bow (positive pressure) but towards the stern (negative pressure). When a ship travels, water moves from the front to the back — and this shifting the water creates pressure as the water moves (which is also where drag comes from). If the water only has a narrow space to move, it has to move faster through that area, so the pressure is higher/lower. (Higher before where it bunches up on the bow, lower after where it rushes to fill behind the stern.) If one side has more space than the other (eg, left has less space) the the water goes faster on that side and so the pressures on that side are more extreme (eg, pushing the left bow rightward and sucking the left stern leftward — turning the ship right). That is, the normal front-to-back pressure can cause a twisting force if the flow isn’t balanced left-to-right. Because the side with less flow ends up with water bunching up at the front and not enough in the back.
- fian 6y agohttps://en.wikipedia.org/wiki/Squat_effect https://en.wikipedia.org/wiki/Squat_effect
- cryptonector 6y agoPressure in fluids is a funny thing. Put your thumb at the open end of a hose with water flowing through it: you'll feel high pressure. But along the sides of the hose the pressure from the flowing water will be a lot lower, and if you poke a hole into the side while leaving the open end open, then you might even observe that hole sucking air in!