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Why source strength ‘X’ per unit length is constant over a given panel?

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Why source strength ‘X’ per unit length is constant over a given panel?

(a) It allows it to varies from one panel to next panel

(b) It does not allow it to varies from one panel to next panel

(c) It remains in the same panel

(d) The length will be changes from panel to panel

This question was addressed to me in an interview.

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

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Best answer
Correct choice is (a) It allows it to varies from one panel to next panel

Best explanation: The source strength ‘X’ per unit length be constant over a given panel but allow it to vary from one panel to the next, that if there are total n panel. The source panel strength per unit length is ‘Xn’. Therefore boundary condition is imposed numerically by defining the midpoint of each panel.

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