Question

For a turbulent flow, which of these is correct?

(a) Fluctuating pressure is equal everywhere

(b) Fluctuating velocity and pressure are not equal everywhere

(c) Fluctuating velocity and pressure are equal everywhere

(d) Fluctuating velocity is equal everywhere

I have been asked this question by my college director while I was bunking the class.

My question is from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics

Answer 1

The correct choice is (b) Fluctuating velocity and pressure are not equal everywhere

Easiest explanation: Turbulent flow structures are highly anisotropic. The flow variables are not the same in a particular direction. Therefore, the fluctuating velocities are also not the same everywhere. Instead, they show continuous variation.