Originally Posted by mturcios777 (Post 399541)

In response to the original poster, moving a parallelopiped can be done by using the layerAdditionRemoval polyTopoChanger. I've tried using rawTopoChangerFvMesh, but I think that is a generic class you can copy and use to implement topology changes. When making a new topoChanger class, I like to proceed like this:

1. Identify what operations need to be done to change the mesh (cell/face/point addition or removal etc)

2. See what polyTopoChanger (in dynamicMeshDict) will perform the operation most efficiently (granted the documentation for these isn't stellar, you may have to do some digging. A quick summary of two
- layerAdditionRemoval: creates or destroys a layer of cells adjacent to a specifies faceZone based on the minimum/maximum thickness of that layer. Only works with simply connected surfaces with minimal warping (fairly consistent face normal). Can be used when a surface is translating and we don't want the cell aspect ratio to change
- attachDetach: switches a set of internal faces to a pair of boundary patches to created internal walls. Can be used to make valves which can be actuated according to times or to other criteria
- hexRef8: refinement of hexahedral meshes; see dynamicRefineFvMesh

3. If possible, find an existing fvMesh class that implements the polyTopoChanger and modify

Otherwise, take rawTopochangerFvMesh and get to work.

Good luck!