CFD Online Discussion Forums - programming of GGI RPM

Hi Folks,

i am trying to create a simulation with autorotation with the uses OF 1.6 extend and the GGI. Now i was trying to do some small changes in the rotation speed of my mesh but it will not work.
for the beginning i tried do amke the speed time dependent by using the equation:
rpm 10*sin(pi*time);

but there was no effect. it was allways the rpm of 10 used. so i used some more easy expression:

dynamicMeshDict:

Quote:

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.3 |
| \\ / A nd | Web: http://www.openfoam.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/

FoamFile
{
version 2.0;
format ascii;
class dictionary;
object dynamicMeshDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dynamicFvMeshLib "libtopoChangerFvMesh.so";
dynamicFvMesh mixerGgiFvMesh;
roundperminute 10 + 10;

mixerGgiFvMeshCoeffs
{
coordinateSystem
{
type cylindrical;
origin (0 0 0);
axis (0 0 1);
direction (1 0 0);
}

rpm $roundperminute;

slider
{
moving (insideSlider);
static (outsideSlider);
}
}

// ************************************************** *********************** //

Result:

Quote:

.
.
.
Create time

Create dynamic mesh for time = 0

Selecting dynamicFvMesh mixerGgiFvMesh
Initializing the GGI interpolator between master/shadow patches: outsideSlider/insideSlider
Time = 0
Adding zones and modifiers to the mesh
Copying existing face zones
Number of cells in the moving region: 5000
Adding point, face and cell zones
Mixer mesh:
origin: (0 0 0)
axis : (0 0 1)
rpm : 10
.
.
.

also i tried:
dynamicMeshDict:

Quote:

dynamicFvMeshLib "libtopoChangerFvMesh.so";
dynamicFvMesh mixerGgiFvMesh;
roundperminute 10+10;

mixerGgiFvMeshCoeffs
{
coordinateSystem
{
type cylindrical;
origin (0 0 0);
axis (0 0 1);
direction (1 0 0);
}

rpm $roundperminute;

slider
{
moving (insideSlider);
static (outsideSlider);
}
}

but the result was always a rotational speed of 10 rpm. how can i "force" OpenFoam to do the calculations an not only to include the first number of the equation?

best wishes

Andy