[ADGlassby]

Hi everyone, I'm having real problems getting a 2D moving mesh to work using SnappyHexMesh. I have looked though various examples of either 2D or moving mesh (using AMI) but I don't seem to be able to make the connection between the two concepts.

My mesh is (very basically at the moment) a circular (cylindrical) boundary with a rotor at the centre. I can create the basic geometry using snappyHexMesh to get the cylindrical mesh with the central rotor and it looks pretty good. I have used the sHM (castellatedMesh only run), flattenMesh, extrudeMesh, sHM (Snap only run). This produces a really good quality mesh. If I try to introduce the AMI interface, following the AMI (3D) examples, using an STL geometry file as the AMI location. This all disappears when I carry out the extrude step so the whole process fails.

I think I'm failing to understand the construction of the AMI interface. My understanding is that the AMI interface is made up of (in my case a circular rotating zone) a fixed FaceZone facing onto a moving (rotating) CellZone in which the rotor should be embedded. The rotor wall should be set up as a nonMovingWall which then causes it to rotate at the speed of the rotating mesh. The rotating cellZone slides past the faceZone and is allowed to do this because of the mesh construction and the declaration of cyclcAMI in the BC files and other relevant locations.

I have attached a basic picture of my geometry. Note that I am using sHM because the geometry I have in mind is a little more complex than the jpg I have attached.

If this is right.... How can I do this AFTER snappyHexMesh has developed the basic mesh?

I could REALLY do with some help now, does anyone have experience with 2D moving meshes (AMI style) using sHM??

Your help would be greatly appreciated. I have been going round in circles now with this for over a month and my head is beginning to spin. I'm sure this isn't as hard as I'm finding it!!

Best Regards

Andrew