Question

Which of these is correct for large eddies?

(a) High viscosity and linear momentum are conserved

(b) Low viscosity and linear momentum are conserved

(c) High viscosity and angular momentum are conserved

(d) Low viscosity and angular momentum are conserved

The question was asked during an online interview.

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

Answer 1

Right option is (d) Low viscosity and angular momentum are conserved

For explanation I would say: Vortex stretching leads to conservation of angular momentum. As the large eddies are associated with vortex stretching, here angular momentum is conserved. They have a high Reynolds number which directly tells that they are relatively inviscid.