NAME

       mkgeo_obstacle - mesh of the obstacle-in-channel (rheolef-7.2)

SYNOPSIS

       mkgeo_obstacle [options] [nx [ny]]

EXAMPLE

       The following command build a triangle-based 2d unstructured mesh of the [-L,L]x[0,c] with a unit circle
       hole at origin.

           mkgeo_obstacle > obstacle.geo
           geo obstacle.geo

DESCRIPTION

       This command is convenient for building a mesh for the obstacle-in-channel geometry, as it is a very
       classical benchmark in complex fluid flow problems. It calls bamg unstructured mesh generator with
       anisotropy feature. The mesh files goes on name.geo where name is the basename for the output (see option
       -name below). The three auxiliary files required for automatic mesh generation with Rheolef combined with
       bamg are also provided:

               name.bamg
               name.bamgcad
               name.dmn

THE GEOMETRY

       -c float
       -L float

            These options control the geometry parameters. Default is c=2 and L=2*c.

       -cartesian
       -zr

            These options control the geometry coordinate system. Default is Cartesian.

       -quarter
       -half

            When the quarter option is activated, the upstream-downstream symmetry is assumed and only one
           quarter of the geometry is considered. Otherwise, with the half option, the upstream-downstream
           geometry is generated Default is the quarter option.

       -N int

            The number of elements around the half of the circular obstacle. When the quarter option is
           activated, only a quarter
            of the circular obstacle is considered. Default is N=100.

THE DISCRETIZATION

       -hmin float

            Controls the edge length on the obstacle. Default is hmin=0.1. Changing the density by the previous
           options applies the factor 1/n to hmin also.

BOUNDARY DOMAINS

       The boundary sides are represented by domains: obstacle, axis, wall, upstream and downstream.

OTHERS OPTIONS

       -name string

            Set the basename for the output files. By default, the basename is obstacle.

       -[no]split

            Split each triangle in three subtriangles by inserting the barycenter as an additional node. This is
           useful for using the Scott and Vogelius incompressible mixed finite element P2-P1d for velocity-
           pressure approximation. Default is no split.

       -[no]clean

            Clear temporary files (this is the default).

       -[no]verbose

            In verbose mode, print to stderr all commands and logs.

IMPLEMENTATION

       This documentation has been generated from file main/sbin/mkgeo_obstacle.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.

rheolef                                            Version 7.2                          mkgeo_obstacle(1rheolef)