Question: Consider the two-dimensional incompressible velocity potential = xy + x2 y2. (a) Is it true that 2 = 0, and, if so, what does

Consider the two-dimensional incompressible velocity potential φ = xy + x2 – y2. (a) Is it true that ∆2φ = 0, and, if so, what does this mean? (b) If it exists, find the stream function ψ(x, y) of this flow. (c) Find the equation of the streamline which passes through (x, y) = (2, 1).

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