| mkgeo_grid(1rheolef) | rheolef | mkgeo_grid(1rheolef) |
NAME¶
mkgeo_grid - structured mesh of a parallelepiped (rheolef-7.2)
SYNOPSIS¶
mkgeo_grid [options] [nx [ny [nz]]]
EXAMPLES¶
The following command build a triangular based 2d 10x10 grid of the unit square:
mkgeo_grid -t 10 > square-10.geo
geo square-10.geo
or in one command line:
mkgeo_grid -t 10 | geo -
DESCRIPTION¶
This command is useful when testing programs on simple geometries. It avoid the preparation of an input file for a mesh generator. The optional nx, ny and nz arguments are integer that specifies the subdivision in each direction. By default nx=10, ny=nx and nz=ny. The mesh files goes on standard output.
The command supports all the possible element types: edges, triangles, rectangles, tetrahedra, prisms and hexahedra.
ELEMENT TYPE OPTION¶
-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.
THE GEOMETRY¶
-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.
For instance, the following command meshes the [-2,2]x[-1.5, 1.5] rectangle:
mkgeo_grid -t 10 -a -2 -b 2 -c -1.5 -d 1.5 | geo -
BOUNDARY DOMAINS¶
-[no]sides
The boundary sides are represented by domains: left, right, top, bottom, front and back.
-[no]boundary
This option defines a domain named boundary that groups all sides.
By default, both sides and the whole boundary are defined as domains:
mkgeo_grid -t 10 -nosides | geo -
mkgeo_grid -t 10 -noboundary | geo -
mkgeo_grid -t 10 -noboundary -nosides | geo -
REGIONS¶
-[no]region
The whole domain is split into two subdomains: east and west. Also, the separating domain is named interface in the mesh. This option is used for testing computations with subdomains (e.g. transmission problem; see usersguide ).
Example:
mkgeo_grid -t 10 -region | geo -
CORNERS¶
-[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.
Example:
mkgeo_grid -t 10 -corner | geo -
mkgeo_grid -T 5 -corner | geo -
COORDINATE SYSTEM OPTIONS¶
-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.
IMPLEMENTATION¶
This documentation has been generated from file main/sbin/mkgeo_grid.sh
AUTHOR¶
Pierre Saramito <Pierre.Saramito@imag.fr>
COPYRIGHT¶
Copyright (C) 2000-2018 Pierre Saramito <Pierre.Saramito@imag.fr> GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
| Mon Sep 19 2022 | Version 7.2 |