Question

The general transport equation is \(\frac{\partial(\rho \Phi)}{\partial t}+div(\rho \Phi \vec{u})+div(\Gamma grad \Phi)+S\). For Eulerian equations, which of the variables in the equation becomes zero?

(a) Γ

(b) ρ

(c) Φ

(d) \(\vec{u}\)

This question was addressed to me in an interview.

I want to ask this question from Euler Equation in division Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

Answer 1

Correct choice is (a) Γ

Explanation: Γ is the diffusion coefficient in the general transport equation. Diffusion of any property is not included in Eulerian equations. So, Γ=0.