I am simulating the behavior of a fluid passing through the interior of a cavity of a cylinder, a wall of the cylinder gives energy to the fluid, has been modeled by non-isothermal flow and applying bousinesq, when performing an analysis of grid independence, When refining the mesh if working with low temperatures does not converge.
Do you know what is due?
Could it be that the effect of gravity is greater than the force exerted by the fluid?
regards