A candidate velocity field is represented by:
V = (9xy^2 + cos(y)) i (in the i direction) - 3y^3 j (in the j direction)
a. is this a possible incompressible flow?
b. is this velocity field irrotational?
c. compute, if possible, both the velocity potential and the stream function.
d. identify any stagnation points in this potential flow field. If it isn't a flow tell how you would identify them if it was.