[Smed]

I am wondering what is the best way to subtract volume from a block in blockMesh. I have attached a drawing of what I want to do. I have an 8 point block, but I want to remove another 8 point block from somewhere in the middle of it. Is there an easy way to do this, or do I need to create 4 separate blocks which surround the empty space and then merge the patches like i've drawn at the bottom of my attachment?

[wyldckat]

Greetings Adam,

If you have properly defined all of the cells, then you can use setSet to:

• select the cells to be removed (which means that they must already exist... ironic, I know);
• then invert the selection;
• then use subsetMesh to save only the last selection of cells.

How to use setSet:

• Good particle example, although not very advisable in some situations: http://openfoamwiki.net/index.php/SetSet
• When in doubt, like setSet states at the start, type the help command!

Best regards,
Bruno

[Smed]

Bruno,

This worked great, thanks! I ended up following the damBreakWithObstacle tutorial ($FOAM_TUTORIALS/multiphase/interDyMFoam/ras/damBreakWithObstacle), for anyone else who's interested.