CFD Online Discussion Forums - [swak4Foam] Parabolic velocity at inlet for 2D axi geometry

Hello.

I am interested in creating a developed flow at the inlet. I am using groovyBC and have checked several other example and forums.

My case is an axisymmetric pipe of 0.1m radius and 2m long.

I am trying to use the parabolic equation
u = umax( 1-(r/R)^2)

I want umax to be 1m/s and this is what I have done so far.

Code:

 in U

inlet

    {

        type            groovyBC;

    variables    "Vmax=1.0;yp=pts().y;maxY=max(yp);para=(1-pow(pos().y/0.1,2))*normal();"

    valueExpression    "Vmax*para";

    value        uniform (1 0 0);

    }

I have added the libs in controlDict as well. However, instead of a parabolic curve, I am getting an oscillating curve and the value of the velocity is remarkably low.

Attachment 77207

Any idea how this can be corrected?

I am using these versions:
swak4Foam version - 0.4.1
OpenFOAM 2.3.1

Thanks