[Steffen595]

Hi,

I am modelling an aircooled chiller, just interested in air velocities, not heat exchange. I got 3 domains: surrounding air. 6 porous domains in a pattern. These are in 3 V-blocks with 2 outlets each. This gets me 3 domains with boundary to the porous domains. The porous domains (radiators with pressure drop about 90Pa at 3m/s) then have boundaries to the surrounding air.
Now the problem: surrounding air is entrainment inlet. The outlets I set as 6 different outlets, each 9kg/s mass flow. The results are pressure drops of 70kPa, this would mean there is a near vacuum inside the vee-blocks. In reality its not, I would expect a few Pa pressure drop.
The only answer I found to multiple outlets, set them as 1 outlet.

Can post a picture later

Cheers,

Steffen

[Steffen595]

its only about 80Pa across the coils, thats the section, where the craph goes down a little. I first simulated the pad on its own to get the porosity settings right

[Steffen595]

I just modeled a block on top to connect the 6 outlets to one, see if that helps. Just using one of the 6 outlets still gets 60kPa pressure drop, not nice. And it drags air through the whole thing. Unfortunately I need to see what happens between the vee blocks. Its a bit of an ask for the software.

Edit: seems to work now. Part of the problem was maybe, the inner bits of the vees, with the outlets, were a 2 bodies. With the block on top now its 1 body.