And god... this naturial convection problem seems to be never going to be converged. everything else seems to go down but only continuity goes up. could I trust the value from this model? I've put hex map mesh quite densely and the shape of the tunnel is a lot like the square so I think it's not a problem of mesh..
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Thanks again Rob! You have no idea how relieved I am receiving help/ advice like this from you.
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