[pawarit28]

Hi,

I was wondering why specifically we require 4 additional transport equations for the Reynolds stresses in 2D flow??

(For the 3D case, it makes perfect sense to take all 6 Reynolds stress components). I understand that turbulence is a 3D phenomenon. Hence, for 2D simulations, we can allow a zero mean W (out of the page) with a fluctuating velocity w'.

But then it raises the question:
Why do we solve for (w'w')?? but not (u'w') or (v'w') then?

Thank you very much everyone!