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-   -   gradually openning the side wall of a tube to a environment with constant stagnations (https://www.cfd-online.com/Forums/openfoam-pre-processing/109436-gradually-openning-side-wall-tube-environment-constant-stagnations.html)

 immortality November 17, 2012 16:38

gradually openning the side wall of a tube to a environment with constant stagnations

hello all my friends all over the world
I want to simulate a long channel you may assume closed end at right side but at the left side the wall move from rest at a constant velocity downward so that it opens to a constant stagnation pressure and stagnation temperature-that we know the values of them-environment that are greater than inside the channel.how can I model this gradually openning wall? should I mix groovyBC and mixed boundary conditions?how?or this can be done easier?
Thank you much for your helping.;)

 immortality November 18, 2012 13:17

any suggest?

could anyone guide me about this problem?what should I do?the problem is 2-D and as I told moving wall BC is replaced with p0 and T0 BC at inlet gradually according to wall velocity.silmply saying its a gradually opennin of a wall to an environment.I appreciate any suggestion and guidance.can this be done by groovyBC?
is it necessary to assign different BC for each cell in boundary?
thank you.

 immortality November 20, 2012 03:02

solving the problem

hello friends
I could simulate gradually opening the door with constant velocity at environment.now for replacing BC by stagnation properties I need the center values of cells neighbouring the boundary.how I can get and use of them?what are the needed functions?
Thank you

 immortality June 16, 2013 12:09

Hi again
I managed to do it.if someone wanted my guidance I'm ready to help him/her.

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