[Amirreza_pro]

Hi guys,
Does anybody know how to set up multiple AMI rotations in OpenFOAM 11?
I’m trying to simulate a bearing where both the cage (casing) and each roller rotate: the cage rotates around the center, and each roller also spins around its own axis.

I’m using the following dynamicMeshDict (see below):
FoamFile
{
format ascii;
class dictionary;
location "constant";
object dynamicMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dynamicFvMesh multiSolidBodyMotionFvMesh;

motionSolverLibs ("libfvMotionSolvers.so");

motionSolver solidBody;
solidBodyMotionFunction rotatingMotion;

multiSolidBodyMotionFvMeshCoeffs
{
// Overall bearing rotation (casing + rollers around bearing center)
Cut_12
{
solidBodyMotionFunction rotatingMotion;
rotatingMotionCoeffs
{
origin (0 0 0);
axis (0 0 1);
omega 100; // rad/s
}
}

// Roller rotation around its own axis
// You need to define a cell zone for each roller
rollerZone1
{
solidBodyMotionFunction rotatingMotion;
rotatingMotionCoeffs
{
// Replace with actual roller center coordinates
origin (-0.0405 0 0);
axis (0 0 1);
// Set appropriate angular velocity for roller
omega -50; // rad/s (negative for counter-rotation)
}
}

rollerZone2
{
solidBodyMotionFunction rotatingMotion;
rotatingMotionCoeffs
{
// Replace with actual roller center coordinates
origin (-0.035071 -0.02025 0);
axis (0 0 1);
// Set appropriate angular velocity for roller
omega -50; // rad/s (negative for counter-rotation)
}
}

}

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



but openfoam11 ignores it and does not read the dynamicmeshDict file!!

[Yann]

Hello Amirreza,

I'm not really using OpenFOAM-11, but it seems the dynamicMesDict syntax has changed. Have a look at the tutorials using dynamicMeshDict your OpenFOAM install to see some examples.

[Amirreza_pro]

Originally Posted by Yann

Hello Amirreza,

I'm not really using OpenFOAM-11, but it seems the dynamicMesDict syntax has changed. Have a look at the tutorials using dynamicMeshDict your OpenFOAM install to see some examples.

Hi Jann,

Thank you for your reply.

In OpenFOAM 11, the dynamicMeshDict uses the following configuration for single-body rotation:

mover
{
type motionSolver;
libs ("libfvMeshMovers.so" "libfvMotionSolvers.so");
motionSolver solidBody;
cellZone innerCylinder;
solidBodyMotionFunction rotatingMotion;
origin (0 0 0);
axis (0 1 0);
rpm 1500;
}

This setup works well for rotating a single body. However, I'm interested in implementing multiple body rotations. My question is: What syntax should I use for multiple body rotations? Does OpenFOAM 11 support this?

In OpenFOAM 9, I attempted to use multiSolidBodyMotionFvMesh, but OpenFOAM did not recognize it. This functionality was available in previous versions. Now, I'm seeking guidance on how to implement multiple body rotations in OpenFOAM 11 or even 9.

[Yann]

Alright, I understand. The challenge is indeed to find the proper syntax for it.

I think there is an example in this tutorial, where a motionSolverList is defined to be able to define motion for several bodies:
https://github.com/OpenFOAM/OpenFOAM...ynamicMeshDict

[Amirreza_pro]

Originally Posted by Yann

Alright, I understand. The challenge is indeed to find the proper syntax for it.

I think there is an example in this tutorial, where a motionSolverList is defined to be able to define motion for several bodies:
https://github.com/OpenFOAM/OpenFOAM...ynamicMeshDict

Thanks alot Yann, exactly that's what I meant
now it is working.
For Openfoam9 also do you know such tutorial which is for multiple body rotation ?
I could not find it.

[Yann]

Hello,

Here is an example: https://github.com/OpenFOAM/OpenFOAM...ynamicMeshDict

You can use grep and find utilities to search for strings or files.
For instance to find all tutorials using rotatingMotion:

grep -rw "rotatingMotion" $FOAM_TUTORIALS

[Amirreza_pro]

Originally Posted by Yann

Hello,

Here is an example: https://github.com/OpenFOAM/OpenFOAM...ynamicMeshDict

You can use grep and find utilities to search for strings or files.
For instance to find all tutorials using rotatingMotion:

grep -rw "rotatingMotion" $FOAM_TUTORIALS

Thnaks alot Yann, yes, you are right.