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Commit 8de2d48e authored by Christophe Geuzaine's avatar Christophe Geuzaine
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remove aniso

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\input texinfo.tex @c -*-texinfo-*- \input texinfo.tex @c -*-texinfo-*-
@c $Id: gmsh.texi,v 1.216 2006-09-08 02:39:43 geuzaine Exp $ @c $Id: gmsh.texi,v 1.217 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 algorithms are still experimental the 3D unstructured algorithm is still experimental and not very robust.
and not very robust. If these algorithms fail, try to change some If this 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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