parabolicVelocity as boundary condition in OF-1.7?
 

Dear All,

as to OpenFOAM version 1.5 there was a boundary condition called 'parabolicVelocity' where parabolic velocity-profiles were applied to patches.

So my question is: Is there any comparable patch-/boundarycondition that can be used?

Or: I got another computation where i can see the parabolic profile in Paraview - how can i export it and use it as inlet-BC for another case?

With best regards,

CST

CST,

One way to create a parabolic inlet velocity profile is in the tutorials. Look through tutorials/incompressible/simpleFoam/pitzDailyExptInlet. The profile is in the constant/boundaryData/inlet directory. You set up the points file to specify points and the /0/U to set the velocity at each point. I use this method frequently - it's easy to set up. If this doesn't work, you can search the forum for velocity profiles or inlet profiles.

Good luck,

Alan

CST,

Another possibility is to use the groovy boundary conditions
see http://openfoamwiki.net/index.php/Contrib_groovyBC

Something like this should make the trick in 2D:

inlet
{
type groovyBC;
variables "yp=pts().y;minY=min(yp);maxY=max(yp);para=-(maxY-pos().y)*(pos().y-minY)/(0.25*pow(maxY-minY,2))*normal();";
valueExpression "10*para";
value uniform (10 0 0);
}

Best regards,

Frederic

Dear Alan

I have simple pipe flow case, length is 1.2 m and radius is = 0.02595 m.
I want to generate the the points file for my case. U(x) = 2U_0 [ 1 - (x/r)^2 ]
x and y varies from -0.02595 to -0.02595 and z varies from 0 to 1.2. Could you give me some suggessions about points file and velocity file in he constant/boundaryData/inlet directory.

Thanks

Alan

Do you have any tutorial for fixing points and velocity. I am a beginner in OpenFoam who is trying to do his MS in CFD. Can you give me a few tips as i have to use 1/7th power law for turbulent flow in my pipe.

Regards