CFD Online Discussion Forums - [swak4Foam] Rotating Wall Velocity and Swak4Foam

Hi,
I am testing a case called 2DRotatingTank. 2/3rd of the tank is filled with water whereas the rest is air. The idea is to rotate the tank at 240rpm for 500 seconds. I am using interFoam solver. When I test the case with rotatingWallVelocity, I get incorrect results, whereas swak4Foram produces correct results. But the difficulty with swak4Foam is that it produces a little bit oscillation and vortices between 30 and 100 seconds.

A same setup is done for both cases except the following changes in 0/U.

For rotatingWallvelocity there are no vortices, but the flow is not reaching the center of the tank at any time. Here is the file content of 0/U

Code:

 boundaryField

{

      walls

     {

         type            rotatingWallVelocity;

         origin          (0 0 0);

         axis            (0 0 1);

         omega           25.4;

         value  uniform (0 0 0);

}

For Swak4Foam, the flow is reaching the center of the tank but there are oscillations. Here is the file content of 0/U

Code:

boundaryField                                                                                                             

{                                                                                                                         

    walls

    {

         type       groovyBC;

         value      uniform (0 0 0);

         variables (

               "xx = pos().x;"

               "yy = pos().y;"

               "zz = pos().z;"

               "w = 25.1328;"

         );

         valueExpression "vector(-w*yy,w*xx,0)";

}

I have attached screenshots of results obtained at 500th second.

I am using OpenFOAM3.0 and Swak4Foam Version 0.3.2.

Is my settings for rotatingWallVelocity perfect? Why do I get different results?

Note that, if I remove value uniform (0 0 0); from rotatingWallVelocity it ends up with error immediately.

Also, I have observed that when I am testing the same case with rotatingWallVelocity in openfoam-plusv1606. It works well and it produces the same result as swak4Foam.