brain anatomy boundary conditions

[Lesage,Anne Cecile J]

Dear all

 

To describe a brain geometrical space contrains, I have three meshes part in my python script

 

meshb=gf.Mesh('import','gid','brainr25tet4h5.GiD.msh')

meshtf=gf.Mesh('import','gid','tentoriumfalxr25h5.GiD.msh')

meshh=gf.Mesh('import','gid','headr25tet4h5.GiD.msh')

 

meshb and mesh are 3d and meshtf is a fine membrane described by a triangle mesh surface

 

mesh and meshtf are attached at several places (nodes in common), how do I ensure that the fem takes this boundary condition in account?

 

To set up that the brain is sliding without friction inside the head, I wrote the following python lines

 

fbb = meshb.outer_faces()  # Boundary of the brain

fbh = meshh.outer_faces()  # Boundary of the head

 

HEAD_BOUND = 1;

BRAIN_BOUND = 2;

 

# selection of faces for contact condition

meshh.set_region(HEAD_BOUND, fbh)

meshb.set_region(BRAIN_BOUND, fbb)

 

md.add_penalized_contact_between_nonmatching_meshes_brick(mim3h, uh, ub, datanamer, HEAD_BOUND, BRAIN_BOUND, 1, lambda1_n)

 

Is it a good option? How to choose the parameters datanamer and lambda1?

 

I would like the brain to slide along the whole meshtf. How to define a set of faces that contains the entire triangles mesh?

 

Thank you

Regards

Anne-Cecile

 

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