STAGNATION POINT

What is stagnation point ?

A point in the field a flow about a body where the fluid particles have zero velocity with respect to the body.

In fluid mechanics a stagnation point is a point in a flow field where the local velocity of the fluid is zero.Stagnation points exist at the surface of objects in the flow field, where the fluid is brought to rest by the object. The Bernoulli's equation shows that the static pressure is highest when the velocity is zero and hence static pressure is at its maximum value at stagnation points. This static pressure is called the stagnation pressure.

Therefore, P(static) + Kinetic Energy = constant

                       P(static) + 0 = constant

Therefore  P(static) = Maximum= stagnation pressure

KUTTA CONDITION :

On a streamlined body fully immersed in a potential flow there are two stagnation points — one near the leading edge and one near the trailing edge. On a body with a sharp point such as the trailing edge of a wing , the kutta condition specifies that a stagnation point is located at that point. The streamline at a stagnation point is perpendicular to the surface of the body.