mkgeo_ugrid(1rheolef)						    rheolef-6.1 					     mkgeo_ugrid(1rheolef)

NAME

       mkgeo_ugrid -- build an unstructured mesh of a parallelotope, in 1d, 2d or 3d

SYNOPSIS

	       mkgeo_ugrid options [n]

EXAMPLE

       The following command build a triangle based 2d unstructured mesh of the unit square:

	       mkgeo_ugrid -t 10 > square-10.geo
	       geo -mayavi square-10.geo

       or in one comand line:

	       mkgeo_ugrid -t 10 | geo -mayavi -

DESCRIPTION

       This  command  is  usefull  when testing programs on simple geometries.	Invocation is similar to mkgeo_grid (see mkgeo_grid(1)).  It calls
       gmsh as unstructured mesh generator.  It avoid the preparation of an input file for a mesh generator.  The optional n argument is an  inte-
       ger that specifies the subdivision in each direction. By default n=10.  The mesh files goes on standard output.

       The  command supports all the possible element types: edges, triangles, rectangles, tetraedra, prisms and hexahedra. It supports also mixed
       2D with triangles and quadrangles:

	       mkgeo_ugrid -tq 10 | geo -mayavi -

       and mixed 3D with tetraedra, prisms and/or hjexaedra:

	       mkgeo_ugrid -TP	10 | geo -mayavi -
	       mkgeo_ugrid -PH	10 | geo -mayavi -
	       mkgeo_ugrid -TPH 10 | geo -mayavi -

ELEMENT TYPE OPTIONS

       -e     1d mesh using edges.

       -t     2d mesh using triangles.

       -q     2d mesh using quadrangles.

       -tq    2d mesh using both triangles and quadrangles.

       -T     3d mesh using tetraedra.

       -P     3d mesh using prisms.

       -H     3d mesh using hexahedra.

       -TP

       -PH

       -TPH   3d mesh using a mixt between tetraedra, prisms and/or hexahedra.

THE GEOMETRY

       The geometry can be any [a,b] segment, [a,b]x[c,d] rectangle or [a,b]x[c,d]x[f,g] parallelotope. By default a=c=f=0 and b=d=g=1, thus,  the
       unit boxes are considered. For instance, the following command meshes the [-2,2]x[-1.5, 1.5] rectangle:

	       mkgeo_ugrid -t 10 -a -2 -b 2 -c -1.5 -d 1.5 | geo -

       -a float

       -b float

       -c float

       -d float

       -f float

       -g float

BOUNDARY DOMAINS

       -sides

       -nosides
	      The boundary sides are representd by domains: left, right, top, bottom,front and back.

       -boundary

       -noboundary
	      This  option  defines  a	domain named boundary that groups all sides.  By default, both sides and the whole boundary are defined as
	      domains:

		      mkgeo_ugrid -t 10 > square.geo
		     geo square.geo
		      mkgeo_ugrid -t 10 -nosides > square.geo
		     geo square.geo
		      mkgeo_ugrid -t 10 -noboundary > square.geo
		     geo square.geo
		      mkgeo_ugrid -t 10 -noboundary -nosides > square.geo
		     geo square.geo

REGIONS

       -region

       -noregion
	      The whole domain is splitted into two subdomains: east and west, This option is used for testing computations with subdomains  (e.g.
	      transmission problem; see the user manual).

		      mkgeo_ugrid -t 10 -region | geo -

CORNERS

       -corner

       -nocorner
	      The corners (four in 2D and eight in 3D) are defined as OD-domains.  This could be usefull for some special boundary conditions.

		      mkgeo_ugrid -t 10 -corner | geo -
		      mkgeo_ugrid -T  5 -corner | geo -

THE MESH ORDER

       -order int
	      The  polynomial  approximation mesh order, as defined by gmsh.  This option enable a possible curved boundary, when applying a suit-
	      able nonlinear transformation to the mesh.  Defualt is order=1.

OTHERS OPTIONS

       -clean clear temporary files (this is the default).

       -noclean
	      does not clear temporary files.

SEE ALSO

       mkgeo_grid(1)

rheolef-6.1							    rheolef-6.1 					     mkgeo_ugrid(1rheolef)