Yplus calculation for buoyant flow
Hello,
I have to refine mesh near wall in a natural convection case and the y plus should between 30 and 300. but in the buoyant case my internal fluid has initial conditions of velocity as (0 0 0). How can I calculate y plus with zero velocity in the domain? The flow should pass from hot wall to cold wall. Thank you 
You could calculate y+ for u=0 (it will be 0) but you should not.
Y+ is only interesting for the final solution, not for the initial conditions. 
You could use the characteristic bouyancy velocity, that one that gives you the Rayleigh number of your problem.

Thank you for the reply guys,
I was given a closed room geometry with an airconditioner attached to one of the walls. and gave an outside temp to be 50degree Centigrades and coefficent of heat transfer is 0.5 W/(m^2 K) for walls. asked to setup yplus between 30 and 300 and correct choice of turbulence model and its parameters. Should I give any inlet velocity at AC vents and outlet pressures? or the air in the room has zero velocity without any inlet velocity. I am new to simulating with energy equation included. Any references to read can be greatly helpful. 
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