Question

Which of these statements is true for an incompressible flow?

(a) Absolute mass flux is not important

(b) Absolute density is not important

(c) Absolute temperature is not important

(d) Absolute pressure is not important

I have been asked this question during an internship interview.

The question is from Incompressible Flows in section Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

Right option is (d) Absolute pressure is not important

Best explanation: There is no need for the absolute value of pressure in an incompressible flow. This is because the flow is not affected by this value. But, their gradients in all the directions are important as it will affect the flow.