[dmoroian]

Hello everybody,
I try to set up a new unsteady boundary condition by deriving it from the fixeValueFvPatchField, and I need to preserve some values between at least two time steps. For that I want to know how long such an object lives? Does it stay in memory between two time steps or I have to use some sort of "static" declaration for the variables I want to preserve?
Another question is that I want to enforce the usage of this boundary only for temperature fields. I suspect I have to use the dimensions for this but can anyone show me how to do that?

Thank you,
Dragos

[mattijs]

The object lives as long as your time scheme. It will get renamed so after a ddt operation your old U becomes U_0 (and for second order time scheme U_0 will become U_00).

Just add a

Pout<< mesh.names()<< endl;

before and after a ddt operation and you'll see. (all objects are registered with the mesh and the 'names()' returns the names of these)

[dmoroian]

Thanks Mattijs,
That is good to know! But my concern was a litle bit different:
I have a class derived directly from fixedValueFvPatchField, and inside that class I define a member scalar. I was wondering if the value of that scalar is preserved from one iteration to another. Judging from your answer, I think yes!

Dragos