Whether it is a steady or transient problem ?
Take cylinder temperature as 350 k & ambient air temperature as 300 k.
Natural convection problem is truly an unsteady process.
But it may solve steady for the purposes of an engineering solution (ie the result is good enough compared to reality).
Thanks Mr Rob & Dr amine
Ansys customers with active commercial software licenses can access the
customer portal and submit support questions. You will need your active account number to register.