COMSOL startup help
COMSOL startup help
(OP)
Hello, this might be a long shot but here we go. I am looking for someone to assist me with some questions about the FEM software COMSOL. Specifically i am creating a single phase cable model which should be able to anticipate temperature rise at diffrent amps through the cable.
I've build the model and figured out some of the basics, but i cannot seem to get the model to show a connection between current density and temperature rise.
I wonna start by doing a 3D stationary model. A solid 2meter cylinder acting as a cable. But i'am not sure how to get comsol to know that i want to have current flowing throgh it.
I have grounded one end of the wire, and put a Normal current density through the other.
My results shows a voltage as a resuslt of the predefined current/resistance which is great.
But the temperature is wierd. The core fo the cable is shows a color which should be a higher temperature than the color of the cable skin.
But the temperature max min is the same.
Can somebody say something about my simple model from the attached screenshots maybe?.
Thanks in advance!
Best regards Jens.
https://files.engineering.com/getfile.aspx?folder=...
https://files.engineering.com/getfile.aspx?folder=...
https://files.engineering.com/getfile.aspx?folder=...
I've build the model and figured out some of the basics, but i cannot seem to get the model to show a connection between current density and temperature rise.
I wonna start by doing a 3D stationary model. A solid 2meter cylinder acting as a cable. But i'am not sure how to get comsol to know that i want to have current flowing throgh it.
I have grounded one end of the wire, and put a Normal current density through the other.
My results shows a voltage as a resuslt of the predefined current/resistance which is great.
But the temperature is wierd. The core fo the cable is shows a color which should be a higher temperature than the color of the cable skin.
But the temperature max min is the same.
Can somebody say something about my simple model from the attached screenshots maybe?.
Thanks in advance!
Best regards Jens.
https://files.engineering.com/getfile.aspx?folder=...
https://files.engineering.com/getfile.aspx?folder=...
https://files.engineering.com/getfile.aspx?folder=...
Talk To Other Members
RE: COMSOL startup help
Is it a strady-state analysis ?
Analytical solution of this simple Joule heating problem might be helpful here.
RE: COMSOL startup help
The analysis/study is steady state yes.
I've added a Heat flux boundary to air with 5 W/m2 to all boundaries except input and output end. A screenshot of this is attached.
I have no thermal conditions at the end of the cable yet. I would think that would require me to know which type of material the terminal connection will be made of?. or is there a general cable shoe W/m2 value?
I will double check the values now, but i suspect some silly mistake to be the culprit which makes my temperature value even everywhere, even tho i can se the color variations.
RE: COMSOL startup help