Filling empty space between two volumetric meshes

[Chanyoung Cheong]

Dear iso2mesh users, 

I wonder if I can find a solution for the following problem. 

As depicted by the picture I've attached, let me suppose there is a volumetric mesh(A; node1, face1, elem1) which is totally enclosing another volumetric mesh(C; node2, face2, elem2). I would like to eliminate tetrahedra of the first volume which are overlapping the second volume(the result is B). If I merge B and C(which is D), there are no overlap between tetrahedra, but there exists empty space between two volumetric meshes. I want to fill the empty space by new tetrahedral elements. 

Could anyone help me with this problem?

Best regards,

Chanyoung Cheong

[Fang, Qianqian]

hi Chanyoung,

mergemesh can't merge tetrahedral meshes that are overlapping. it simply concatenates the node/elem lists and does not check intersection at all.

instead of merge two tetrahedral meshes, you should create separate surface meshes, and then use mergemesh (if surface do not intersect) or mergesurf /surfboolean (if they do intersect) to properly merge the two domains.

if you want to create a cavity, you should use the "holes" list in the s2m.

here is an example

[no1,fc1]=meshabox([-5 -5 -5],[5 5 5],1);
figure;plotmesh(no1,fc1)
[no2,fc2]=meshacylinder([0 0 0],[0 0 4],1,1);
figure;plotmesh(no2,fc2)
[no3,fc3]=mergemesh(no1,fc1,no2,fc2(:,1:3));
figure;plotmesh(no3,fc3,'x>0')
[node,elem]=s2m(no3,fc3,1,10,'tetgen',[],[0 0 1]);
figure;plotmesh(node,elem,'x>0')

I set the holes parameter to [0 0 1] which is inside the cylinder compartment, tetgen then removes it from the final mesh, see output

Qianqian

Best regards,

Chanyoung Cheong

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