- #1
fog37
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Hello Forum,
I am clear on what the pressure at a point ##P## is on the wall of heigh of a dam at a certain depth ##d## below the water free surface: ## \rho g d+P_atm##. The deeper we go the higher the pressure.
Now let's consider a different scenario: there is initially no water and water starts flowing at a speed ##v## and rushes against the wall of the dam. The point of impact becomes a stagnation point since the fluid is brought to rest and or/ diverted upward: as time ##t## goes by, the water level increases since the water has nowhere else to go except upward.
Question: as water comes in (the water level will eventually reach the height of the dam wall) is the pressure ##p## on the wall at point ##P## the same, larger or smaller than the hydrostatic pressure at the same point ##P## when the fluid is instead completely at rest?
This is clearly an application of Bernoulli's equation but I am not sure how to use the principle properly.
I had some flooding recently and the fence was pushed down so I wonder if it is due to the pressure due to the amount of water (height of the water volume) that started accumulating against the wall or to the impact/momentum of the water rushing in...
Thank you!
I am clear on what the pressure at a point ##P## is on the wall of heigh of a dam at a certain depth ##d## below the water free surface: ## \rho g d+P_atm##. The deeper we go the higher the pressure.
Now let's consider a different scenario: there is initially no water and water starts flowing at a speed ##v## and rushes against the wall of the dam. The point of impact becomes a stagnation point since the fluid is brought to rest and or/ diverted upward: as time ##t## goes by, the water level increases since the water has nowhere else to go except upward.
Question: as water comes in (the water level will eventually reach the height of the dam wall) is the pressure ##p## on the wall at point ##P## the same, larger or smaller than the hydrostatic pressure at the same point ##P## when the fluid is instead completely at rest?
This is clearly an application of Bernoulli's equation but I am not sure how to use the principle properly.
I had some flooding recently and the fence was pushed down so I wonder if it is due to the pressure due to the amount of water (height of the water volume) that started accumulating against the wall or to the impact/momentum of the water rushing in...
Thank you!
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