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Question
A stream function is defined by the expression Ψ = 2X2 - Y3.Calculate the components of velocity at point P (X = 3, Y = 1)
A.
-3, -12
B.
+3, +12
C.
+3, +1
D.
+12, -1
Answer ( Option B)

+3, +12

Solution

Ψ = 2X2 - Y3
For point P (x = 3, y = 1)
U = 3 × 12 = 3
V = 4 × 3 = 12

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