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        "author": "Thomas Titscher",
        "author_email": "thomas.titscher@gmail.com",
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            "License :: OSI Approved :: MIT License",
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        "description": "# xdmf_dolfin_fix\n\nThere is an xdmf import issue in FEniCS/DOLFIN. Quadratic triangles and tetrahedrons\nare imported incorrectly. The CLI tool `xdmf-dolfin-fix` fixes this issue by reordering element numbers.\n\n### Example usage\n~~~\nxdmf-dolfin-fix old.xdmf            # fix old.xdmf\nxdmf-dolfin-fix old.xdmf new.xdmf   # create fixed new.xdmf\nxdmf-dolfin-fix old.geo -d3         # create fixed old.xdmf from gmsh\nxdmf-dolfin-fix old.msh new.xdmf    # create fixed new.xdmf from gmsh\n~~~\n\n### Problem\n\nAt some point of the simulation FEniCS/DOLFIN orders the vertices of all elements\nin numerically accending order. Nodes on the edges of elements -- as present\nin quadratic triangles and quadratic tetrahedrons -- are not swapped.\n\nSo internally, the node numbers of an arbitrary quadratic tetrahedron\n\n~~~\n[ vertices |    edges   ]\n[ 51 74 12 | 14 72 1003 ]\n~~~\n\nwould be reordered to\n\n~~~\n[ 12 51 74 | 14 72 1003 ]\n~~~\n\nNow, the vertex nodes `[12 51 74]` are sorted, but the edge nodes `[14 72 1003]`\nare left unchanged. This results in a twisted geometry.\n\n### Fix\n\n`xdmf-dolfin-fix` sorts the vertex nodes **and** reorders the edge nodes accordingly. This\nwill result in\n\n~~~\n[ 12 51 74 | 1003 14 74 ]\n~~~\n\nA further sorting within DOLFIN has no effect and, thus, will not mess up\nthis ordering.\n\n\n\n\n",
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        "name": "xdmf-dolfin-fix",
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        "summary": "A tiny package to modify the node order of quadratic triangles and tets in a xdmf-hdf mesh to work with FEniCS/DOLFIN.",
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