In fluid dynamics, a "'stagnation point "'is a point in a flow field where the local velocity of the fluid is zero.
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Total enthalpy is the same at every point in a flow field so the stagnation enthalpy at a stagnation point is identical to the total enthalpy everywhere in the flow field.
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Wind tunnel studies have shown that, in a step-up canyon where the upwind building is shorter, a stagnation point can be identified on the windward face of the taller building.
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These are also known under the name of " edge flames ", characterized by a local extinction on their axis because of the high strain rates in the vicinity of the stagnation point.
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A parcel of air which approaches the airfoil along the stagnation streamline is cleaved in two at the stagnation point, one half traveling over the topside and the other half traveling along the underside.
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If the fluid flow at some point along a streamline is brought to rest, this point is called a stagnation point, and at this point the total pressure is equal to the stagnation pressure.
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In this case the air blow slit is located at the pressure side near the leading edge stagnation point location and the control air-flow is directed tangentially to the surface but with a forward direction.
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As the air passing the underside of the airfoil reaches the trailing edge it must flow around the trailing edge and along the topside of the airfoil toward the stagnation point on the topside of the airfoil.
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The spanwise flow on swept wings produces airflow that moves the stagnation point on the leading edge of any individual wing segment further beneath the leading edge, increasing effective angle of attack of wing segments relative to its neighbouring forward segment.
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This distinctive pyramid shape not only kept the aerodynamic " stagnation point " low but also neatly allowed the incorporation of a " crushable structure " as required by the 1973 regulations which specified that all fuel tanks were to be protected by deformable structures.
