Question

Consider a flow over a flat plate of uniform cross section area, the flow moves at a constant speed. Due to a certain disturbance, there is a disturbance in the flow. In the given scenario, which of the following statement is true?

(a) The flow remains uniform even after the disturbance

(b) The flow remains uniform throughout

(c) The flow is the first uniform and after disturbance undergoes non-uniformity

(d) The disturbance will change the cross section area

The question was asked by my school principal while I was bunking the class.

This intriguing question comes from Uniform Flow in section Inviscid & Incompressible Flow of Aerodynamics

Answer 1

Correct option is (c) The flow is the first uniform and after disturbance undergoes non-uniformity

For explanation: At the beginning, the flow is uniform and steady flow. After the disturbance, the cross section still remains the same, but the flow velocity changes and the flow become unsteady.