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The standard merge-algorithm is N^2 over the face-points and uses a geometric proximity test for the merge. These are both choices for implementation simplicity and are rather inefficient for large meshes. I have now implemented an experimental linear topological merge algorithm which is VERY fast and effective for meshes of any size. Currently it will merge internal faces on meshes of arbitrary complexity but does not yet handle edge or face collapse needed for wedges and other degenerate blocks. The new fast-merge algorithm may be selected using the optional "fastMerge" entry: fastMerge yes; and if not present the standard N^2 algorithm will be used. Henry G. Weller CFD Direct
README for OpenFOAM-dev
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About OpenFOAM
OpenFOAM is a free, open source computational fluid dynamics (CFD) software package released by the OpenFOAM Foundation. It has a large user base across most areas of engineering and science, from both commercial and academic organisations. OpenFOAM has an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solid dynamics and electromagnetics.
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http://www.gnu.org/licenses/, for a description of the GNU General Public
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