<urc>
<url>ftp://ftp.ica3.uni-stuttgart.de/pub/ug/ug3.1
<title>Unstructured Grids (UG)
<title_line>for the adaptive multigrid solution of partial differential
equations
<author>Peter Bastian &lt;peter@ica3.uni-stuttgart.de&gt;
<contact>ug@ica3.uni-stuttgart.de
<version>3.1
<description><url>http://www.ica3.uni-stuttgart.de/~ug</url>
<abstract>
UG is a flexible software library for the development of adaptive multigrid
methods on unstructured meshes. The main idea of UG was to implement most parts
in a problem-independent way, so that the software can be reused for many
different applications.

The main features of the problem-independent part are:

* 2D (triangles, quadrilaterals) and 3D (tetrahedra) unstructured meshes
* tree-based local refinement and coarsening
* user-definable number of degrees of freedom in nodes, edges, faces and
  elements (conforming, non-conforming and mixed finite-elements can be
  implemented)
* BLAS and iterative methods (smoothers, multigrid, cg)
* powerful script language
* Multi-window graphical user interface for X11 and Macintosh. No special
  graphics libraries required
* 1000 pages of documentation (man-pages, postscript)
* Parallel version with reduced functionality available (2D, degrees of
  freedom only in nodes, dynamic load balancing, interfaces for PVM, NX,
  PARIX, T3D, MPI)

Applications in the current distribution include:

* 2D scalar diffusion equation with linear conforming and nonconforming
  finite-elements
* 2D linear elasticity with conforming and non-conforming finite-elements
* 2D incompressible, stationary Navier-Stokes equations
* 3D convection-diffusion equation
<comments>UG is available for free for all non-profit organizations.
<category>numerical-PDEs
<keywords>partial differential equations; unstructured grid; multigrid method
</urc>