Which of the following statements are correct?
1. Velocity potential exists for irrotational flows only.
2. Stream function is defined only for the two-dimensional flow which is steady and compressible.
3. If velocity potential (ϕ) satisfies the Laplace equation, then the flow is rotational
1
1 and 2
2
2 and 3
3
only 1
4
1,2 and 3