Hi,

I'm modeling heat flow in a wall cavity filled with porous insulation material. I'm using a laminar model and I'm using fixed exterior and interior boundary conditions. The results give the maximum velocity in the cavity to be very small (about 4e-4).

I'm thinking the problem might be due to the Inertial Resistance factor which I don't have and I don't have the experimental results of velocity and pressure values to get this coefficient. I'm wondering if this is a critical thing in the modeling? I'm leaving it as 0 now. When I change this value to some random number (e6), it effect my results very slightly.

I appreciate your help with this,

Saba

You are absolutely right Saba. I performed the calculation in perforated wall before where the spesific pressure drop versus the flow capacity should be applied. So you have to make some experiences with this or you can use the formulation from what you can find in the Fluent Manual. But for me, the pressure drop and flow capacity test data is the best way to have satisfaction result.