Is It True That Ideal Fluids Always Flow from High Pressure to Low Pressure?

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The statement that "ideal fluids always flow from high pressure to low pressure" is overly simplistic and does not account for the complexities of fluid dynamics. In scenarios involving constrictions, pressure can decrease as velocity increases, demonstrating that flow behavior can be influenced by factors other than just pressure differences. This means that an ideal fluid may not always flow directly from high to low pressure in every situation. The relationship between pressure and velocity is crucial in understanding fluid behavior, particularly in areas of varying cross-section. Thus, the flow of ideal fluids cannot be solely defined by pressure gradients.
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What's wrong with this statement: 'Ideal fluids always flow from high pressure to low pressure'? Could someone give me an example of where this is not true?
 
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syang9 said:
What's wrong with this statement: 'Ideal fluids always flow from high pressure to low pressure'? Could someone give me an example of where this is not true?

Isn't pressure related to velocity? When there is flow through a constriction isn't the pressure in a constriction lower due to the higher velocity? And on the other side then when it slows again?
 

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