Stagnation point

In fluid dynamics, a stagnation point is a point in a flow field where the local velocity of the fluid is zero.

[1]: § 3.5  In compressible flows, stagnation pressure is also equal to total pressure as well, provided that the fluid entering the stagnation point is brought to rest isentropically.

[1]: § 3.12 A plentiful, albeit surprising, example of such points seem to appear in all but the most extreme cases of fluid dynamics in the form of the "no-slip condition" - the assumption that any portion of a flow field lying along some boundary consists of nothing but stagnation points (the question as to whether this assumption reflects reality or is simply a mathematical convenience has been a continuous subject of debate since the principle was first established).

[1]: § 3.6 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.

[3] The streamline at a stagnation point is perpendicular to the surface of the body.