Steady and Transient Heat problem

[Natt]

Hello,

I am working on 2D heat problem. I am trying to impose temperature  for 4 boundaries. It works in steady state problem but not in transient.
In transient problem the temperature condition that I impose for y=0 and y=2.5 doesn't work.
I attach both of them.

Thanks in advance.

Natalia

[Prof. S. Govindjee]

You have a couple of oddities in your files.

In the steady file you are entering data in EBOU for dofs that are not in the problem.

(Not a real issue, but you can delete all the data on the "cartesian" line after "20 20")

In the transient file you are asking for 2 dofs but there is only 1 in a thermal problem.
In the transient solution the order of the ODE is first order.  ORDER refers to the temporal order, not the spatial order.  Notwithstanding, you can delete the ORDER command as FEAP will default to the correct value.

Lastly, it is a good idea to carefully check the output file to make sure that all of your input data is being read correctly.

[Natt]

Thank you very much for your answer.

But I just have a question , how can I make initial temperature as 0 at all nodes and then impose temperature for 4 sides ?
If I do it in that way it is right ?
     
cboun
 NODE ALL 1

cdisp
 NODE ALL 0

ebou
 1 0.0 1
 1 5.0 1
 2 0.0 1
 2 2.5 1
 
edisp
   1 0 0.2
   1 5 0.3
   2 0 0.5
   2 2.5 0.6

I am trying to impose 0 temperature with cboun and cdisp and then use eboundary to apply certain temperatures at x=0,x=5,y=0,y=2.5.

[Prof. R.L. Taylor]

Things are zero by default.

Tou only need to define nonzero values. 

[Natt]

Thank you very much for your help !