Some say that CFD means “Colors For Directors”, a joke that translates the “visual appeal” that is sold sometimes, but that does not necessarily represent the physical or computational fidelity of the results delivered.
Large values of Q correspond to regions of high angular velocity close to the vortex cores.
Even though the differences are very subtle, they exist and I propose an explanation here that can help new researchers in this field.
A structured mesh will not necessarily be calculated as such.
Turbulence is a deterministic (non-random) phenomenon, being treated as random only for modeling purposes.