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For a two-dimensional incompressible flow, what type of flow is described when both the velocity potential function (ϕ) and the stream function (ψ) are constant?

15. For a two-dimensional incompressible flow, what type of flow is described when both the velocity potential function (ϕ) and the stream function (ψ) are constant?

1. Rotational flow
2. Irrotational flow
3. Vortical flow
4. Compressible flow

Answer: B) Irrotational flow

Explanation:

When both the velocity potential function (ϕ) and the stream function (ψ) are constant, it indicates an irrotational flow, where the fluid particles move without any rotation or vorticity.