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-   -   [swak4Foam] groovybc / swak4foam question (https://www.cfd-online.com/Forums/openfoam-community-contributions/126447-groovybc-swak4foam-question.html)

RodriguezFatz November 18, 2013 03:24
groovybc / swak4foam question
 
Hi all,

I just implemented a groovybc and I am not sure if I did it right. Can someone confirm that this does what it should? I want the standard "Menter" wall boundary condition for omega:

Code:
PIPE_WALL
{
  type groovyBC;
  valueExpression "10*(6*nu)/(0.075*sqr(y))";
  value uniform 1e9;
}
How do I know the names of "y" and "nu" for the omega file? Also: Is "y" the denormalized "y+"?

Thanks for any help,
Philipp.

RodriguezFatz November 22, 2013 05:46
I'm trying

Code:
type groovyBC;
        valueExpression "10*(6*nu)/(0.075*sqr(mag(delta())))";
        value uniform 1e9;
now. Can someone confirm that?

gschaider November 22, 2013 13:13
Quote:
Originally Posted by RodriguezFatz (Post 463065)
I'm trying

Code:
type groovyBC;
        valueExpression "10*(6*nu)/(0.075*sqr(mag(delta())))";
        value uniform 1e9;
now. Can someone confirm that?
No idea. Depends on how this Menter-condition is defined

RodriguezFatz November 25, 2013 05:26
Boundary condition at the wall (not the first cell point) should be
10 * 6 * viscosity / (0.075 * dy*dy)
with dy = the distance from the wall to the first point.

gschaider November 25, 2013 09:15
Quote:
Originally Posted by RodriguezFatz (Post 463373)
Boundary condition at the wall (not the first cell point) should be
10 * 6 * viscosity / (0.075 * dy*dy)
with dy = the distance from the wall to the first point.
If with "first point" you mean "cell center" you should be OK: http://openfoamwiki.net/index.php/Co...g_to_need_are:


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