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Automatic, general-purpose quadrilateral mesh generator for processing of complex multiply-connected domains.
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What is QUAD-GEN?
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A great variety of finite element software is being developed throughout
the world. While major efforts of development teams are usually
concentrated on the mathematical cores of the codes, accurate and
reliable mesh generation often requires even more significant investment.
Quadrilateral elements have many advantages
over triangles, especially in terms of their
accuracy in the evaluation of stress fields. Triangular mesh generators are plentiful, available at
little or no cost from public domain. On the contrary, source codes of
a commercial-quality quadrilateral generator are difficult to obtain.
Being fully aware of this situation, we have developed a variety of
such generators: powerful, reliable and easy to include into
commercial FEA applications.
QUAD-GEN is a fully automatic quadrilateral mesh generator, designed
specifically with the purpose of direct inclusion into the source codes of your finite element
applications. You can create
your own point-and-click interface that would allow creating a domain boundary.
After that, a set of simple data structures has to be
passed into QUAD-GEN, and the rest is done automatically. Two data
structures: for nodes and elements, are returned and can be further used
as necessary.
For generation of highly anisotropic, non-structured quadrilateral finite
element meshes, we developed another product: ANISO-QUAD . Our most recent, flexible and universal product
QUAD-BUILD 5.0 can also be used for
general-purpose problems, especially for processing of structural
engineering models.
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What advantages does QUAD-GEN have ?
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QUAD-GEN is an accurate and reliable program, capable of creating
quality and, if necessary, very large quadrilateral meshes. Its main features are:
- ability to process "long-and-narrow" domains. The domain
may contain up to several hundreds of long-and-narrow internal boundaries.
Such boundaries can be separated from each
other by narrow gaps (for example, in modeling of printed circuit boards);
- ability to handle regions divided to several subregions with
different physical properties. This comes useful in several areas of
science; for example, in geophysics, where cross-section of the Earth's
crust may reveal several layers of different materials;
- ability to process extremely irregular geometries with complexly
shaped internal boundaries;
- the process is fully automatic, requiring no interference from the user
as soon as the input data structures are prepared;
- the outer boundaries of subregions, as well as inter-layer division
lines, can be segments of straight lines or arcs, and/or their arbitrary
combinations. Boundaries of broad complexities can be described that way.
- a variety of sophisticated algorithms implemented in QUAD-GEN 3.5
virtually eliminated a possibility of generating highly distorted
elements. Elements with internal angles exceeding 170 degrees (or below
10 degrees) appear quite often in other commercial packages, but not in
QUAD-GEN 3.5. Our own statistics show that on average QUAD-GEN 3.5
may generate just one "distorted" element per 10,000 , and in
majority of cases this is a consequence of selecting too large element
sizes in geometrically complex part of the domain. Automatic
post-Laplacian refinement algorithms always provide final corrections to all distorted
elements. Alternatively, the user can set a smaller step size
along the relevant parts of the boundary, and significantly distorted elements won't be generated at all.
- QUAD-GEN 3.5 contains a special algorithm for fully
automatic element size calculation.
The user can simply set a single parameter in the input data structure,
and QUAD-GEN 3.5 will automatically generate a mesh with a smallest
possible number of elements. No other information, apart from the
geometrical description of the domain's boundary, is required.
QUAD-GEN 3.5 is unmatched in its exceptional ability to generate
100% quadrilateral meshes.
Below is the mesh obtained from processing of a printed circuit board model.
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All our codes are written in ANSI C and will compile and run on all UNIX
and Windows platforms. They are also fully commented, allowing easy
modification at user discretion.
If you would like to purchase QUAD-GEN 3.5 we will provide you with
the one-off, royalties-free commercial license that allows incorporating
QUAD-GEN 3.5 directly into your codes.
The QUAD-GEN 3.5 distribution kit includes:
- fully-commented source codes in ANSI C;
- the product's User Manual containing detailed descriptions of input and output
data structures and an example driver program;
- a simple GUI application
that will allow you displaying domains that are to be meshed, as well
as generated quadrilateral meshes.
QUAD-GEN 3.5 is completely developed by our company and contains no
third party code.
Finally, our "try-before-you-buy" policy. If you send us
examples of your typical domains, we will run QUAD-GEN 3.5
and send you generated meshes. If you are satisfied with the results,
you can then buy QUAD-GEN 3.5.
To learn more about the full range of our products please follow this
link.
Please contact us to find out more, preferably by e-mail on comecau@ozemail.com.au or
comecauinfo@gmail.com.
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