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find the adjacent face on the boundary

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Old   June 23, 2012, 10:12
Default find the adjacent face on the boundary
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bojiezhang
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Hello everyone:

I want to find the cells surround one cell "on the boundary", (the cell is face). If I know one face ID, how can I find the faces ID around this face? For example, if the face is quadrangle, I want to find the other 8 faces around it.

Could someone know how to deal with it? Thank you!

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Old   June 25, 2012, 03:36
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Mark Olesen
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Quote:
Originally Posted by bojiezhang View Post
Hello everyone:

I want to find the cells surround one cell "on the boundary", (the cell is face). If I know one face ID, how can I find the faces ID around this face? For example, if the face is quadrangle, I want to find the other 8 faces around it.

Could someone know how to deal with it? Thank you!

bojiezhang
Finding the immediate neighbouring faces (eg, 4 neighbouring faces from a quad) shouldn't be too bad:
- from boundary face, get the owner cell
- for this owner cell, get all the associated faces
- get the neighbouring cells from the faces
- loop through to find the which of the neighbour cell faces to find a boundary face.

If you need the "corner" faces, my first approach would be brute force.
- from the boundary face you know the vertices, place them in a labelHashSet.
- loop through the boundary faces and tag each face that shares a vertex with the original face. A labelHashSet of the face Ids might be useful here.

This should work. Instead of looping across all boundary faces, you may want to restrict your search to a particular patch though - for efficency and to avoid finding a neighbour with a different BC treatment.
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