temperature below the initial condition

Anna (aka new-user)

DEar Experts,

Here is a general problem: I am solving a natural convection case and my teperature drops below the initial value. There is no cooling, no air inlets, so the question is where does it come from??? it happens locally near the walls and in the cormers of the model.

I use the low Re no. k-eps model of turbulence.

Thank you

a.