Learning Forum

[Mert41]

Deal All Expert;

I am facing a problem with APDL Codes.

there ara two part in my transient thermal analysis and intial temperatures of these parts are different.

Desk part is 20 C and work piece part is 150 C.

For that reason I am defining inital temperature in APDL.

I created named selection and give the name Desk and work_piece as Body and work_piece surface as surface.

APDL Command was created like that.

IC,Desk,TEMP,20       ! initial temperature of the Desk on which the work piece was welded. its temperature is 20 C

IC,work_piece,TEMP,150   ! initial temperature of work piece. it was pre-heated up to 150 C

[Chandra Sekaran]

The command you applied looks OK to me. Make sure to specify IC for all the nodes in the model. How do you know this is not working? One thing you can do is to remove all other boundary conditions i.e. just set IC command only and run for a short time. Then look at the results to make sure you are getting the IC temperatures.

[Mert41]

Dear

Thank you for your suggestion.
I will try your suggestion.

[Mert41]

Dear
I tried in the beginning it applies 150 C but when I run analysis I think it is not applying beginning temperature as 150 C.
here is the a capture showing the case at 0,1 sn of analysis.

and another capture showing the case at 0,8 sn of analysis.

and another capture showing the case at 14,5 sn of analysis.

and the temperature of the work piece is decreasing with time but during my welding process it should stay at 150 C.
I could not realize this Boundary condition.
I add B.C. perfectly insulated to the work piece but it is operating the same.
I would appreciate it if someone could give some suggestions to fix it.
Thank you in advance!

[dinhan0394]

the commands are worked. IC command is initial condition (not a constant over time), after 0.1s temperature will transfer to workpiece, temperature of top body will decrease.
Temperature of workpiece decrease: try to improve the mesh. Mesh of workpiece too coarse. Mesh transition between 2 bodies is not good.

[Mert41]

Dear
Thank you for your suggestions.
The commands are worked.
The Case is like below.
Du─▒ring the welding process I will measure the temperature at three different points like below.
But work piece should be at 150 C during the welding process. For that reason it is heated with electircal resistance and enable it to stay at 150 C like second photo. Only welding section is opened for welders.
I cannot set up the heat transfer correctly. I am making mistake or missing something.
what do you suggest for my case to realize heat transfer correctly.
I would appreciate it if someone could give some suggestions to fix it.
Thank you in advance!