global boundary conditions

[Yaakov]

Dear Feap Team & Users,

How can I set global Dirichlet boundary conditions in FEAP (transient problem) , e.g. If the value of a feld variable (e.g. temperatur field ...) is smaller than 1,0, this value must to be 1,0 (const.).

Best Regards,
Yaakov

[Prof. R.L. Taylor]

I am  not quite sure what you want to impose.

Are you asking for a thermal problem to always have T > 1 -- so if the solution is computed as T < 1 you want it to be 1?

If so, we do not support this.  This is an optimization type problem with a constraint.  There are algorithms to do this but you would have to interface with feap.

If you want to do something else describe in more detail what you want to happen.

[Yaakov]

Dear Prof. Taylor,

thanks very much for your  reply!

my problem is an optimization type problem with a constraint.

[FEAP_Admin]

A poor man's way to do this quickly would be to write a user element that enforces the constraint and apply it every node; if you do it with a penalty function it is particularly simple.