Default Results for hotRoom case

hackit2me · March 31, 2008, 00:07

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 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?

platopus · July 25, 2008, 08:42

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!

March 31, 2008, 00:07	OpenFoam Community, I have	#1
hackit2me New Member Christopher Join Date: Mar 2009 Posts: 2 Rep Power: 0	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

April 8, 2008, 11:20	I had a look at hotRoom in par	#2
platopus Member Graeme Cottrell Join Date: Mar 2009 Posts: 30 Rep Power: 17	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.

July 24, 2008, 19:57	where is this tutorial?	#3
plainstyle New Member S P Join Date: Mar 2009 Posts: 10 Rep Power: 17	where is this tutorial?

July 25, 2008, 08:42	From memory, it is in the buoy	#4
platopus Member Graeme Cottrell Join Date: Mar 2009 Posts: 30 Rep Power: 17	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.

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October 11, 2011, 09:55		#5
Toorop Member Tibor Nyers Join Date: Jul 2010 Location: Hungary Posts: 91 Rep Power: 16	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!