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What is the normal component of the flow velocity at the rth control point?

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What is the normal component of the flow velocity at the rth control point?

(a) Sum of the freestream

(b) Sum of source line

(c) Sum of the sink line

(d) Sum of the source and sink line

The question was asked in an online interview.

This key question is from Nonlifting Flow over Arbitrary Bodies topic in section Inviscid & Incompressible Flow of Aerodynamics

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Best answer
Correct choice is (a) Sum of the freestream

Easy explanation: The normal component of the flow velocity at the rth control point is the sum of that due to the free stream and that due to the source panels. The boundary condition stats that this sum must be zero and it is the cruse of the source panel method.

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