PRM file

The PRM file contains the description of the boundaries of the domain. An example of the PRM data file for an unit square mesh is given in Algorithm .

The parameters in the PRM data file are

NBCT : Number of Boundary Components. Its value is 1 when the entire domain only one part)

Then for each part of the domain describe the types of boundaries:

-

IBCT : Index of the part of the domain

-

NCOMP : Number of boundaries in current part of the domain

-

ITYP : Boundary type (line, curved, spline, etc, see Table )

-

NSPLINES : Number of Splines in the boundary

-

NPAR : Number of parameters used to describe the boundary

PARAMETERS : Parameter values

N_HOLES : Number of holes in the domain.

-

Points in each holes : coordinates of the hole

Table: Values for variable in PRM data file.

Geometry	ITYP	2D$/$ 3D	NPAR	Explanations
Line	1	2D,3D	2	starting coordinates, displacement
Circle	2	2D,3D	3	center coordinates, Radius_a & Radius_b, start angle & end angle
Spline	3	2D,3D
Polynomial	4	2D,3D
Non Uniform Spline	5	2D,3D
Plane	10	3D	3	Coordinates of one point in plane, Orthogonal vectors in the plane, Outer normal vectors
Sphere	11	3D	3

Note that a negative ITYP values is used to denote that the boundary part is curved so that it will be taken cake while refining the mesh and isoparametric transformation will be used during finite element mapping, e.g., -2 for Circle.