cfdlame 
November 14, 2011 11:14 
natural convection in stratifeid zone
The problem is: For different solver setting I'm experiencing natural convection in zone, where initialized temperature gradient is less than the lapse rate  convection should't occure.
I'm investigating convection in closed cube 3kmx3kmx2km with adiabatic boundary condition (hex grid 150000 elements). Initialized temperature gradient is decreasing 0,5K/100m (adiabatic lapse rate is 1K/100m). I've tried: boussinesq, ideal gas, and real gas for a density model, for both solvers: density, and pressure based (presto, second order for everything). I don't even know solver type matters, probably not. UDF is written fine. In every case convection occured. Somebody have any idea?
TomeK
