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by (120 points)
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Hello everyone,

I wanted to ask if there is a way to assign a specific tag number (which is, by default, 1) to a block?

For example, I generate a block (mesh.Block), on which I then define different regions (e.g. a sphere, box, cylinder, ...), which in turn I can assign a tag number to. What I am looking for is something like:

geom = mesh.Block(size=(x, y, z), resolution=1., tag=0)

To my knowledge, this is possible only for connecting linear elements of the underlying geometry (for boundary conditions) and for regions of the block but not the block itself.

Cheers in advance,

Joshua

2 Answers

0 votes
by (17.5k points)

Does this function provide what you are looking for?

https://opencarp.org/documentation/carputils-documentation#master/classcarputils_1_1mesh_1_1block_1_1Block.html%23a51c587a5cc73bc84a78ffed1b3b5b773

If yes, then it could indeed make sense to add this extra option to the constructor as you suggested.

0 votes
by (570 points)
I think that Block does not support a variable default tag. Instead any elements which are not tagged explicitely will be tagged as 1.

A possible solution is to setup the tag for the complete mesh. For instance if you have a Block mesh you can assign BoxRegion over the whole domain. For that you can addapt the following code:

    (x, y, z) = (10, 10, 10)
    default_tag = 0
    geom     = mesh.Block(size=(x, y, z), resolution=1.)
    initial  = mesh.BoxRegion(lowerleft=(-x/2,-y/2.,-z/2.), upperright=(x/2,y/2,z/2), tag=default_tag)
    geom.add_region(initial)

Just make sure to add all your region before adding the initial region, otherwise the initial region will take precedence (so it will be the only region in the mesh).
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