Rheolef
7.2
an efficient C++ finite element environment
|
unstructured mesh of a parallelepiped
mkgeo_ugrid [options] n
mkgeo_ugrid -t 10 > square-10.geo geo square-10.geo
The previous command build a triangle based 2d unstructured mesh of the unit square:
This command is useful when testing programs on simple geometries. Invocation is similar to those of mkgeo_grid
. It callsg gmsh
as unstructured mesh generator. It avoid the preparation of an input file for a mesh generator. The optional n argument is an integer 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, tetrahedra, prisms and hexahedra. It supports also mixed 2D with triangles and quadrangles:
mkgeo_ugrid -tq 10 | geo -
and mixed 3D with tetraedra, prisms and/or hexahedra:
mkgeo_ugrid -TP 10 | geo -paraview - mkgeo_ugrid -PH 10 | geo -paraview - mkgeo_ugrid -TPH 10 | geo -paraview -
-e
1d mesh using edges.
-t
2d mesh using triangles.
-q
2d mesh using quadrangles (rectangles).
-T
3d mesh using tetrahedra.
-P
3d mesh using prisms.
-H
3d mesh using hexahedra.
-tq
2d mesh using both triangles and quadrangles.
-TP
-PH
-TPH
3d mixed mesh combining tetrahedra, prisms and/or hexahedra.
-a
float
-b
float
-c
float
-d
float
-f
float
-g
float
The geometry can be any [a,b] segment, [a,b]x[c,d] rectangle or [a,b]x[c,d]x[f,g] parallelepiped. By default a=c=f=0 and b=d=g=1, thus, the unit boxes are considered.
-[no]sides
The boundary sides are represented by domains:
left
,right
,top
,bottom
,front
andback
.
-[no]boundary
This option defines a domain named
boundary
that groups all sides.
-[no]region
The whole domain is split into two subdomains:
east
andwest
. Also, the separating domain is namedinterface
in the mesh. This option is used for testing computations with subdomains (e.g. transmission problem; see User's guide ).
-[no]corner
The corners (four in 2D and eight in 3D) are defined as OD-domains. This could be useful for some special boundary conditions.
-cartesian
-rz
-zr
Specifies the coordinate system. The default is
cartesian
while-rz
and-zr
denotes some axisymmetric coordinate systems. Recall that most of Rheolef codes are coordinate-system independent and the coordinate system is specified in the geometry file.geo
.
This option is related to curved boundaries. Since boundaries are here flat, this option has no practical effect and is provided for test purpose only.
-order
int
The polynomial approximation mesh order, as defined by
gmsh
. This option enable a possible curved boundary, when applying a suitable nonlinear transformation to the mesh. Default is order=1.
This documentation has been generated from file main/sbin/mkgeo_ugrid.sh