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-   -   Boundary condition life time (http://www.cfd-online.com/Forums/openfoam-solving/59956-boundary-condition-life-time.html)

dmoroian October 23, 2006 07:50

Hello everybody, I try to set
 
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 October 27, 2006 03:36

The object lives as long as yo
 
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 October 27, 2006 08:33

Thanks Mattijs, That is good
 
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


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