Question

In the incompressible flows, the correction implies a correction in _________

(a) momentum

(b) velocity

(c) mass

(d) density

I have been asked this question in an online quiz.

Question is taken from Incompressible Flows in portion Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

Right choice is (b) velocity

Explanation: In general,

\(\dot{m}=\rho uA\)

A correction in mass flow rate cannot be the correction in density as density is constant in the incompressible flows. It cannot be a correction in area also as it is geometrically defined by the grids. So, it must be a correction in velocity.