COMSOL Multiphysics™

geominfo
DD = reshape(ff2{m}(im1,im2,:,:),2,2). If the corresponding normal
derivative DNN and Jacobian J are obtained as above, then DD = -DNN'*J.
crv is a cell array of same size as Par containing curvature information of edges and
faces. crv{m} is of size nm1-by-nm2-by-2 in 3D, where for a parameter point defined
by the indices im1 and im2, crv{m}(im1,im2,1) is the curvature and
crv{m}(im1,im2,2) is the torsion, when referring to an edge. The corresponding
values obtained for a face is the Gaussian curvature and the mean curvature,
respectively. In 2D, crv{m} is of size nm1-by-nm2 where crv{m}(im1,im2) contains
the curvature of an edge for a given parameter.
rng is a cell array of same length as Od, containing parameter range information for
edges or faces. For edges, the first row in a matrix corresponds to the starting
parameter value at the starting point, and the second row corresponds to the end
parameter value at the end point. For faces, the first and third row contains the lower
bounds on parameter values for the u and v parameters respectively. The second and
fourth row contains the upper bounds on parameter values for the u and v
parameters respectively. The range for geometry edges is from zero to the arc-length
of each edge. If no Od is specified, rng is a matrix of range information for all edge
curves, in 2D, or all faces, in 3D.
ud is a matrix containing up (left) and down (right) subdomain numbering for
boundary segments, in the first and second row, respectively. One column of ud
corresponds to one boundary segment.
sd is a vector containing the subdomain numbering of the vertices of mp. If a vertex
is adjacent to more than one subdomain, the contents are NaN.
There is a family of low-level geometry functions used by geominfo, for obtaining
the geometric data described above. These can be called directly, which in some
cases can be preferred. Their names and descriptions are given in the table below.
TABLE 1-67: LOW-LEVEL GEOMETRY FUNCTIONS
FUNCTION
flgeomadj
flgeomec
flgeomed
flgeomes
flgeomfc
flgeomfd
DESCRIPTION
Get geometry adjacency matrices
Get curvature information from curve derivatives
Get coordinates and derivatives for geometry edges
Get parameter space size of geometry edge
Get curvature from fundamental forms
Get coordinates and derivatives for geometry faces
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