Existing (unstructured) meshes: Wrappers to third-party mesh generators

oomph-lib does not provide its own unstructured mesh generator but has several mesh classes that generate unstructured meshes from the output of third-party unstructured mesh generators.

Notes:

1. The unstructured tet and triangle meshes listed below can not be used with oomph-lib's mesh adaptation or node-update procedures. A suitably fine mesh has to be generated offline by the third-party mesh generator. If required, node-updates (in response to changes in the domain boundaries) have to be performed manually.
   
   
2. For some element types, the mesh generation process is not particularly efficient (yet!). A suitable warning message is issued in such cases.
   
   
3. Since the third-party mesh generators tend to triangulate the domain with simplex elements, curvilinear boundaries are not resolved more accurately by using higher-order elements unless some post-processing is performed.
   
   
4. The meshes have not been tested as extensively as oomph-lib's structured meshes, described elsewhere.
   
   

Mesh list

Mesh	Representative Mesh plot
TriangleMesh<ELEMENT> This class creates oomph-lib meshes based on the output from J.R.Shewchuk's Delaunay mesh generator Triangle The mesh can be used with all FiniteElements that are derived from the geometric finite element TElement<2,NNODE_1D>. Example driver codes: The use of Triangle and the TriangleMesh class are explained in a separate tutorial. In another tutorial we demonstrate how the code fig2poly.cc may be used to generate input files for Triangle based on the output from the open-source drawing program xfig.
TetgenMesh<ELEMENT> This class creates oomph-lib meshes based on the output from Hang Si's open-source mesh generator Tetgen . The mesh can be used with all FiniteElements that are derived from the geometric finite element TElement<3,NNODE_1D>. Example driver codes: The use of Tetgen and the TetgenMesh class are explained in a separate tutorial.
Generating meshes from medical scans with VMTK We provide the option to generate tetgen-based meshes for physiological fluid-structure interaction problems, using the Vascular Modeling Toolkit (VMTK). Example driver codes and tutorials: We provide a separate tutorial that shows how to generate oomph-lib meshes from medical images. The methodology is used in the following driver codes: The inflation of a blood vessel. Finite Reynolds number flow through a (rigid) iliac bifurcation. Finite Reynolds number flow through an elastic iliac bifurcation.
GeompackQuadMesh<ELEMENT> This class creates oomph-lib meshes based on the output from Barry Joe's mesh generator Geompack++, available as freeware at http://members.allstream.net/~bjoe/index.htm. The mesh can be used with all FiniteElements that are derived from the geometric finite element QElement<2,2>. Example driver codes: The use of Geompack++ and the GeompackQuadMesh class are explained in a separate tutorial.

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