DHIJWASv Software FEFLOW 6.1

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provided, all of them with their specific options and
properties. Some algorithms can consider also lines and
points in the supermesh and allow a local mesh refinement
at polygon edges, lines and points.
Mesh generation is typically a trial-and-error process.
The user hereby iteratively optimizes element
numbers, generator property settings and—if necessary—the
supermesh until a satisfactory mesh is
obtained.
Significant effort can be involved in mesh generation,
especially in cases with a large number of geometrical
constraints (many polygons, lines and points). In
typical cases, however, the effort required for generating
a good finite-element mesh saves time at later
stages of the modeling process due to reduced risk of
instabilities.
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There are many different strategies for the discretization
of complex domains into triangles or quad elements.
As each has its specific advantages and
disadvantages, FEFLOW supports three different algorithms
for triangulation and one for quad meshing.
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Advancing Front is a relatively simple triangular
meshing algorithm that does not support any lines or
points in the supermesh. If present, they are simply
ignored in the generation process. Its main advantages
are its speed and its ability to produce very regularly
shaped elements.
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GridBuilder—developed by Rob McLaren at the
University of Waterloo, Canada—is a flexible triangulation
algorithm. GridBuilder supports polygons, lines
and points in the supermesh as well as mesh refinement
at points, lines, or supermesh polygon edges.
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Triangle is a triangulation code developed by
Jonathan Shewchuk at UC Berkeley, USA. It is
extremely fast, supports very complex combinations of
polygons, lines and points in the supermesh, allows a
minimum angle to be specified for all finite elements to
be created, and provides the means for local mesh
refinement with a maximum element size at lines or
points of the supermesh.
FEFLOW provides a convenient interface to Triangle,
which can be freely downloaded from the developer’s
website. Please refer to the FEFLOW help
system for a detailed description of the process to
enable Triangle in FEFLOW. Free use of Triangle is
based on conditions defined in a usage agreement
available in the FEFLOW help system and from the
Triangle website.
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Transport Mapping is the algorithm used in
FEFLOW for generating meshes of quadrilateral elements.
This option requires that the quad meshing
option in the Mesh menu is selected and that all supermesh
polygons have exactly four nodes.
Lines and points in the supermesh are ignored when
generating quadrilateral meshes.