[egp]

The hotRoom tutorial for buoyantFoam in 1.5 gives unphysical results. The same tutorial in 1.4.1-dev and 1.4.1 gives results which look correct (i.e., thermal plume emanating from a 600 degree source on the floor). The 1.5 results never generates the plume, and the temperature collapses to values below the boundary values, which is mathematically impossible. This has been reported on the discussion board, but I've not seen follow-up. The pre-processor, setHotRoom, is working and properly sets the floor temperature. I haven't had a chance to debug, but my guess is that there is a bug in the basicThermo model.

[niklas]

I ran the case in 1.5 and it does indeed produce some weird results, but it looks like it has already been fixed in the git version 1.5.x

[eugene]

I can confirm what Niklas said. We are running the patched version without any problems.

[tstovall]

I've noticed the same problem occurs for the lesBuoyantFoam solver. When will the corrected patch version be available?

[mattijs]

This should be fixed in the 1.5.x git version. Both codes use the same included code.

[chrisd]

buoyantFoam / buoyantSimpleFoam seems to have been broken again
I have tried both a 1.5.x git build and also most recently the 2009-02-02 1.5-dev code.

The hotroom results I have got are the same as described above – no plume emanates and the temperature drops below 300 – Illustrated here at time=400 for the 2009-02-02 1.5-dev code, http://img207.imageshack.us/my.php?i...eenshotdz2.png

[mattijs]

I ran the 1.5.x buoyantFoam hotRoom tutorial just now and get a nice plume. Temperature drops slightly below 300K (299.932K at t=25s) due to the segregated solving (if I run with timestep 5x smaller I get a smaller error: 299.949K at 25s).

[prashant24983]

Chris,

clip the temperature range on paraFoam, you will be able to see the the plume.

Prashant

[chrisd]

Thanks for the help – could someone please tell me what sort of range of values I should be getting?

With the standard tutorial case of a 600k patch I get a temperature range of 300.15 - 300.38k at t=400. I'm really new to this and was just expecting it to be larger...

http://img149.imageshack.us/my.php?i...reenshot1a.png

[mattijs]

The hotRoom case is just a tutorial. The flow is not well resolved - in vertical directions cell size is 0.5m! As an experiment just by having more cells in the vertical direction max temperature went up to 307K.