Currently I am working on the
 

Currently I am working on the bubble dynamics with OpenFoam. I want to use a fixed-grid, sharp-interface method for it. Is it difficult to implement a cut-cell approach for moving boundary in OpenFoam? Please give me some suggestion, thanks very much.

Is there any class that I can
 

Is there any class that I can deal with just one or two cells? For example, I want to cut a cell by a plane or merge two adjoining cells.

Hi Chen, you can cut cells an
 

Hi Chen,
you can cut cells and deal with moving boundary by means of the mesh modifiers implemented in OpenFoam.
Have a look at the $FOAM_SRC/topoFvMeshes, $FOAM_TUTORIALS/icoTopoFoam and $FOAM_APP/incompressible/icoTopoFoam

If you want only to move boundaries without changing the mesh topology you can have a look at how the mesh is moved in the movePiston.H file in the $FOAM_SRC/engine/include

You can also find something useful in the discussion group, have a look to the "Dynamic Mesh Changes" topic in the tree view.

bye
tommaso

Hi Chen, Cut cell by plane:
 

Hi Chen,

Cut cell by plane: the closest example is the mesh/advanced/refineWallLayer. Defines cut through cells by the cut through the edges and/or vertices.

Merge two adjoining cells: mesh/advanced/removeFaces

Thank you! I have tried the c
 

Thank you!
I have tried the class cellCuts and it seems to work.

Would be quite interested to s
 

Would be quite interested to see some examples if you have something working.

http://www.cfd-online.com/Open
 

http://www.cfd-online.com/OpenFOAM_D...ges/1/1084.jpg

I have generated a uniform 2-D
 

I have generated a uniform 2-D mesh using blockMesh. Then I used the removeFaces to merge two adjoining cells by adding the adjoining face into the faceSet. But I got an error message "XXXX face is not internal". Can you tell me why?
Thank you very much for your kind reply!

Are you sure the faces you're
 

Are you sure the faces you're trying to remove are internal (i.e. inbetween two cells)? Use foamToVTK with the -faceSet option to display them.