Stagnation point

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Photo showing stagnation point and attached vortex at an un-faired wing-root to fuselage junction on a Schempp-Hirth Janus C glider.

The stagnation point is a point on the surface of a submerged body in a flow where the velocity at the surface of the submerged object is zero, the pressure is highest relative to any other point on the surface of the submerged body, and where the streamline is perpendicular to the surface of the solid. On a solid body fully immersed in a potential flow, there are two stagnation points. On a body with a sharp point such as a trailing edge of a wing, the Kutta condition specifies that a stagnation point is at that location.

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