Elmer-FEM Tutorial, Thermal Problem, where is a mistake?

[LeeA]

Dear friends
I am not too experienced in thermal problems, but here is a problem with educational example.
I tried to do it exactly like it is described in tutorial but could not obtain proper numerical value (if it is really correct)
http://youtu.be/tkbaWYAz1XU
Also I tried to solve it in CalculiX (here is the INP file: http://yadi.sk/d/tzsPs0d16hLgU ) without success.
My questions are:
1) Where is a source of mistake?
2) What is the proper value of max. temperature.
3) -optional. Can you help me to find simple verification thermal problems like this?
Thank you

[raback]

Hi

The max. temperature seems to be 586.5 K in the fresh version of the tutorial. What do you get?

Now the idea of the tutorial is to be able to follow the workflow - what you did - rather than the specific numerical value. If you get minor difference you may have some difference in the meshing. The algorithms may have some randomness depending on floating point operations. The result is not grid converged so different meshes will give slightly different values.

Unfortunately I'm not familiar with CalculiX.

-Peter

[LeeA]

Hi
The max. temperature seems to be 586.5 K in the fresh version of the tutorial. What do you get?
-Peter

Hello Peter
Thank you for response. Now it is 567, what is pretty close
download/file.php?id=1466
CalculiX is open-source software, also good structured and well documented, as Elmer. My mistake is due to luck of experience in thermal problems (i'am structural engineer)

[LeeA]

I think I see what happened
Here are 3 pictures with results in three programs.
Lisa-fet, CalculiXForWin and Elmer-FEM
There is a difference in the heat-source value definition. When I take 27 instead of 0.01, I get very similar results. Most probable 0.01 is taken in Watt/kg but in other programs they use Watt/m^3. There is nothing about that in tutorial. Also there is a problem with units in STEP file. It is not scaled in your example (you use big detail where mm are m). But in can be critical in practice.
I am sorry for that but results are important for me, because I'm engineer.