Question

The major difference between the Navier-Stokes equations and the Euler equations is the dissipative transport phenomena. The impact of this phenomena in a system is ____

(a) They decrease entropy

(b) They increase entropy

(c) They increase internal energy

(d) They decrease internal energy

I have been asked this question in an interview for job.

Question is from Navier Stokes Equation topic in section Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

Answer 1

Correct answer is (b) They increase entropy

To explain: Dissipation is the process where energy is transformed from one form into another. This transformation increases the entropy of the system.