Question

In unsteady flow, the streamline also changes from instant to instant.

(a) true

(b) false

I have been asked this question during an interview.

My enquiry is from Uniform Flow in portion Inviscid & Incompressible Flow of Aerodynamics

Answer 1

The correct answer is (a) true

The explanation is: All the hydrostatic parameters change from time to time in unsteady flow including the velocity. The streamline defines the direction of flow when a tangent is drawn from any point in that flow field. As the velocity changes, the streamlines to changes.