FEATool Multiphysics
v1.17.0
Finite Element Analysis Toolbox

GRIDBDR Generate grid boundary information.
[ B ] = GRIDBDR( P, C, A, THLIM, FIX_BDR, B0 ) Given arrays P, C and A with cell connectivities and adjacency information generates an array with boundary information. The last three input arguments are optional.
Input Value/(Size) Description  p (n_sdim,n_p) Coordinate array for grid vertices. c (n_pcell,n_cells) Cell connectivity pointer array where the entries in each column correspond to the cell vertex numbers. a (n_pcell,n_cells) Array with cell adjacency pointers where the entries in each column correspond to the neighbouring cell number for each edge or face. A zero entry indicates that the edge/face belongs to a boundary. thlim scalar {0.77} boundary edge detection limit, splits boundaries with cos(normal angles) less than thlim. fix_bdr logical {0} collect all boundary edges to the same boundary b0 (4/5/6,n_b0) Array of partially precomputed boundaries . Output Value/(Size) Description  b (4/5/6,n_b) Array with boundary information, the first row indicates the cell number, followed by cell edge/face, boundary number, and the components of the normal vector for each boundary edge/face