Bernoulli Principle -- Reversed The Bernoulli Principle states that as the velocity of a fluid increases, the pressure of that fluid decreases. However what if it were to be reversed: As the velocity of the fluid decreases, the pressure increases; is this possible?
I am looking at pressure differentials and how pressure is 'high' on the lower surface of the aerofoil. But is the pressure truly 'higher' or is it of normal pressure of the surroundings of the aerofoil?
So this is where the question comes in: If the pressure of the airflow is greater ont the lower surface of an aerofoil, then doesn't that mean that the airflow is slower? Or is the 'high pressure differential' just a word to help differenciate the concept of pressure on an aerofoil, and truly the pressure on the lower surface of the wing is normal?
As said on Wikipedia, the principle says:
$$\frac{v^2}{2} + gz + \frac{p}{\rho} = \text{constant}$$
i.e., assuming no changes in the gravity potential energy or density:

an increase in velocity comes with a decrease in pressure
a decrease in velocity comes with an increase in pressure

It's all part of the same principle, there is no &quot;reverse&quot; needed.