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-   -   Default Results for hotRoom case (http://www.cfd-online.com/Forums/openfoam-solving/58702-default-results-hotroom-case.html)

hackit2me March 31, 2008 00:07

OpenFoam Community, I have
 
OpenFoam Community,

I have just run the buoyantFoam hotRoom tutorial case for the first time. The solution solves and converges nicely, however the solution shows the entire room is still at 300 degrees after 400 timesteps.

Should not the 600 degree source at the floor patch change the temperature throughout the entire room to something other than 300 degrees?

Thank you in advance for any assistance,
Christopher

platopus April 8, 2008 11:20

I had a look at hotRoom in par
 
I had a look at hotRoom in paraFoam not long after you posted it. There does seem to be some hot stuff near the floor, but I'm not experienced enough to tell whether that's an artifact or not.

At first sight, on the volume rendering, it looks like the temperature of the wall is bleeding into the volume by less than a cell via the volPointInterpolate(T) algorithm, but if you look at volPointInterpolate(k) you see what looks like activity in a column over the hot section and spreading out across the ceiling. Unfortunately, I don't know what k is, or how it's calculated.

Perhaps 400 seconds isn't enough time to heat up the room appreciably, but just enough to get a bit of a convection current going.


Regards, Graeme.

plainstyle July 24, 2008 19:57

where is this tutorial?
 
where is this tutorial?

platopus July 25, 2008 08:42

From memory, it is in the buoy
 
From memory, it is in the buoyantFoam subdirectory of the tutorials directory, when you install it as per the directions. I don't recall seeing it mentioned in the documentation, though.

Unfortunately, I don't currently have OpenFOAM installed; my computer's in a transitional state, so I can't be more specific.


Regards, Graeme.

Toorop October 11, 2011 09:55

Hi All,

I have experienced the same behaviour as Christopher and have the same observation, the room should heat up considerably. Nevertheless, ParaView shows only minimal heat increase in the domain, only 1-2 Kelvins. It's only visible if you turn off rescale to data range and adjust it yourself. The other properties look good, though - as far as I can judge it.

buoyantSimpleFoam and buoyantPimpleFoam produces the same strange T distribution with OpenFOAM 2.0.x - so I guess everything is fine with the solvers since the first post is 3 years old now. Can someone please tell me what physical property should be changed to trigger a more "spectacular" temperature distribution. Thx!


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