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braennstroem February 20, 2011 15:50

natural convection ventilation
1 Attachment(s)

I am just trying to setup a small test case in 1.7.x for a generic HVAC case with two dummy cylinders placed in the room as a heat source with a heat flux boundary condition... I attached the case with the snappy mesh.
The meshing and running works fine... unfortunately there is no 'plume' development above the cylinder. The heat flux/power is set to 50W for the cylinder1 and it should give for this setup a velocity of around up to 0,2m/s at 40cm above the cylinder... I get something with 4e-5 m/s (just after 350 iterations, but this is still strange for me) !?
It is probably a quite stupid mistake, but I can't find it and would be happy, if one of you have a hint, what I am doing wrong with the setup!? I actually tried to upload the stl's as well, but they were a bit too large, so if someone needs them I would send it by mail.

Best Regards!

Btw... the above counts for a relaxation factor of 1.0 for rho and not like in the fvSolution of 0.01 and the z-direction goes a long with the height of the room.

braennstroem February 21, 2011 03:37

sorry bothering you, I was just not waiting long enough ;-)
After around 1500 iterations I could see that it goes in the right direction...

lmblanes March 28, 2011 08:59

Hello Fabian

Which solver do you use to run the Code?


braennstroem March 29, 2011 13:03


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