[gmingardo]

Hi all,
I am trying to simulate a water cooling system to assess how much heat I can get rid of. This cooling system is a rather tight and long channel, inside an aluminium support. So, given the heat entering the aluminium support from one of the wall, I need to calculate the conduction in the support first, and the convection with the fluid after. For this simulations I used the System coupling between Steady Thermal Model and CFX, 7 as max iteratons and 0.05 as a residual target.

I know that the low Reynolds (around 12000) number could have given problems with the turbulence model; I used the SST with no modifications, but I followed the suggestions on the boundary layer meshing given in: http://www.computationalfluiddynamic...oundary-layer/

My boundary conditions are:
CFX: mass flow at inlet and outlet, temperature at the inlet
Thermal: 1kW entering heat, 373 K of temperature at the support boundary

The simulations keep giving unreasonable results, with extracted heat around 7 kW (despite the incoming heat is 1kW) and wall heat transfer coefficients of 125000 W/(m^2K)

Do you have any idea? Let me know if you need any further information.
Thank you in advance for your help