# mkgeo_ballrheolef - Online in the Cloud

This is the command mkgeo_ballrheolef that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

### PROGRAM:

#### NAME

mkgeo_ball -- build an unstructured mesh of an ellipsoid, in 2d or 3d

#### SYNOPSIS

mkgeo_ball options [n]

#### EXAMPLE

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

mkgeo_ball -t 10 > ball-10.geo
geo -mayavi ball-10.geo

or in one comand line:

mkgeo_ball -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), mkgeo_ugrid(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 integer that specifies the subdivision in each direction. By default
n=10. The mesh files goes on standard output.

#### ELEMENTTYPEOPTIONS

-t 2d mesh using triangles.

-tq 2d mesh using both triangles and quadrangles.

#### THEMESHORDER

-order int
The polynomial pproximation mesh order, for the curved boundary, as defined by
gmsh. Defualt is order=1.

#### THEGEOMETRY

The geometry can be ellipse/ellipsoid inscribted in the [a,b]x[c,d] rectangle or the
[a,b]x[c,d]x[f,g] parallelotope. By default a=c=f=-1 and b=d=g=1, thus, the unit balls are
considered.

-s Only a surface mesh is generated: a curved line in 2d or a curved surface mesh in
3d. In 3d, supports both '-t' and '-q' options.

-a float

-b float

-c float

-d float

-f float

-g float

#### BOUNDARYDOMAINS

The meshes defines a domain named boundary that groups all boundary sides.

#### OTHERSOPTIONS

-fix

-nofix By default, internal face and volume node from gmsh are recomputed, since they have
incorrect coordinate that destroy the convergence properties of isoparametric high
order elements (order >= 3). The -nofix option skip this correction: this option
is available for test purpose.

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

-noclean
does not clear temporary files.

-verbose

-noverbose
print intermediate commands and information messages.

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