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Larry Price
gmsh
Commits
8de2d48e
Commit
8de2d48e
authored
18 years ago
by
Christophe Geuzaine
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remove aniso
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doc/texinfo/gmsh.texi
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8de2d48e
\input
texinfo.tex @c -*-texinfo-*-
\input
texinfo.tex @c -*-texinfo-*-
@c
$
Id: gmsh.texi,v
1
.
21
6
2006
-
09
-
08
02
:
39
:
43
geuzaine Exp
$
@c
$
Id: gmsh.texi,v
1
.
21
7
2006
-
11
-
27
03
:
22
:
25
geuzaine Exp
$
@c
@c
@c Copyright (C) 1997-2006 C. Geuzaine, J.-F. Remacle
@c Copyright (C) 1997-2006 C. Geuzaine, J.-F. Remacle
@c
@c
...
@@ -460,9 +460,9 @@ tetrahedra) finite element meshes. The performance of the 1D and 2D
...
@@ -460,9 +460,9 @@ tetrahedra) finite element meshes. The performance of the 1D and 2D
algorithms is pretty good; the 3D algorithm is still experimental and slow
algorithms is pretty good; the 3D algorithm is still experimental and slow
(see @ref
{
Mesh module
}
, and @ref
{
Tutorial
}
);
(see @ref
{
Mesh module
}
, and @ref
{
Tutorial
}
);
@item
@item
specify target element sizes accurately. Gmsh provides several
mechanisms to
specify target element sizes accurately. Gmsh provides several
control the size of the elements in the final mesh:
through interpolation
mechanisms to
control the size of the elements in the final mesh:
from geometrical point characteristic lengths or
geometrical attractors, or
through interpolation
from geometrical point characteristic lengths or
from user-defined background meshes (@pxref
{
Mesh commands
}
);
from user-defined background meshes (@pxref
{
Mesh commands
}
);
@item
@item
create simple extruded geometries and meshes (see @ref
{
Geometry commands
}
,
create simple extruded geometries and meshes (see @ref
{
Geometry commands
}
,
...
@@ -524,10 +524,10 @@ transfinite or extruded meshes;
...
@@ -524,10 +524,10 @@ transfinite or extruded meshes;
Gmsh is not a multi-bloc generator: all meshes produced by Gmsh are
Gmsh is not a multi-bloc generator: all meshes produced by Gmsh are
conforming in the sense of finite element meshes;
conforming in the sense of finite element meshes;
@item
@item
the 2D anisotropic and
the 3D unstructured algorithm
s are
still experimental
the 3D unstructured algorithm
is
still experimental
and not very robust.
and not very robust.
If th
ese
algorithm
s
fail, try to change some
If th
is
algorithm fail, try to change some
characteristic lengths to
characteristic lengths to
generate meshes that better suit the geometrical
generate meshes that better suit the geometrical
details of the
details of the
structures;
structures;
@item
@item
Gmsh was designed to solve academic ``test cases'', not industrial-size
Gmsh was designed to solve academic ``test cases'', not industrial-size
problems. You may find that Gmsh is too slow for large problems (with
problems. You may find that Gmsh is too slow for large problems (with
...
@@ -1972,13 +1972,6 @@ module. The final element sizes are of course constrained by the structured
...
@@ -1972,13 +1972,6 @@ module. The final element sizes are of course constrained by the structured
algorithms for which the element sizes are explicitly specified (e.g.,
algorithms for which the element sizes are explicitly specified (e.g.,
transfinite and extruded grids: see @ref
{
Structured grids
}
).
transfinite and extruded grids: see @ref
{
Structured grids
}
).
@item
@item
You can use geometrical ``attractors'', an elaborate version of the method
described in the preceding item: see the definition of the @code
{
Attractor
}
command below.
Attractors only work with the 2D anisotropic algorithm (see the
@code
{
Mesh.Algorithm
}
option in @ref
{
Mesh options
}
).
@item
You can give Gmsh an explicit background mesh in the form of a scalar
You can give Gmsh an explicit background mesh in the form of a scalar
post-processing view (see @ref
{
Post-processing commands
}
, and @ref
{
File
post-processing view (see @ref
{
Post-processing commands
}
, and @ref
{
File
formats
}
) in which the nodal values are the target element sizes. This
formats
}
) in which the nodal values are the target element sizes. This
...
@@ -2001,19 +1994,6 @@ Here are the mesh commands that are related to the specification of
...
@@ -2001,19 +1994,6 @@ Here are the mesh commands that are related to the specification of
characteristic lengths:
characteristic lengths:
@ftable @code
@ftable @code
@item Attractor Point | Line @
{
@var
{
expression-list
}
@
}
= @
{
@var
{
expression
}
, @var
{
expression
}
, @var
{
expression
}
@
}
;
Specifies a characteristic length attractor. The @var
{
expression-list
}
should contain the identification numbers of the elementary points or lines
to serve as attractors; the two first @w
{
@var
{
expression
}
s
}
prescribe
refinement factors in a coordinate system local to the entities, and the
last @var
{
expression
}
a decay factor. This feature is still experimental,
and only works with the 2D anisotropic algorithm (see @code
{
Mesh.Algorithm
}
in @ref
{
Mesh options
}
). An example of the use of attractors is given in
@ref
{
t7.geo
}
.
Please note that attractors are an @emph
{
experimental
}
feature (to be
considered @emph
{
at most
}
alpha-quality...). Use at your own risk.
@item Characteristic Length @
{
@var
{
expression-list
}
@
}
= @var
{
expression
}
;
@item Characteristic Length @
{
@var
{
expression-list
}
@
}
= @var
{
expression
}
;
Modifies the characteristic length of the points whose identification
Modifies the characteristic length of the points whose identification
numbers are listed in @var
{
expression-list
}
. The new value is given by
numbers are listed in @var
{
expression-list
}
. The new value is given by
...
...
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