Suffix File Type Description
----------------- --------------------
.tags TAGS Surface Tags Data Grid File
A TAGS file contains a list of surface
IDs and surface BC properties.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
input files.
.poly POLY Unstructured B-Surf Grid File
A POLY file contains a tria/quad face
boundary surface grid. This file type is
used by TetGen.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
output files.
.stl A 3D stereo-lithography B-Surf Grid File
A STL file contains a tria face
boundary surface grid.
.surf SURF 3D Unstructured B-Surf Grid File
A SURF file contains a tria/quad face
boundary surface grid.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
.tri Cart3D TRI Unstructured B-Surf Grid File
A Cart3D TRI file contains a tria face
boundary surface grid. This file type is
generated by the Cart3D system.
.cfd++ CFD++ Grid File Set
A CFD++ grid file set contains a tria/
quad face boundary surface grid and a
polyhedral element volume grid. This
file type uses multiple files for
coordinates (nodesin.bin), elements
(cellsin.bin), and surface faces
(exbcsin.bin).
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
output files.
.cgns CGNS Data File
A CGNS data file contains a tria/quad
face boundary surface grid and
(optionally) a polyhedral element volume
grid.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
.cobalt.grd Cobalt Grid File
A Cobalt grid file contains a tria/quad
face boundary surface grid and a
polyhedral element volume grid.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
output files.
.egrid Ensight Gold Grid File
An Ensight Gold grid file contains a
tria/quad face boundary surface grid and
a polyhedral element volume grid. This
file type writes an additional case file
(case_name.case).
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
output files.
.fgrid FGRID 3D Unstructured Grid File
A FGRID file contains a triangulated
boundary surface grid and (optionally)
a tetrahedral volume grid. The FGRID
file type is derived from the FAST
(PLOT3D) unstructured grid file type.
FGRID and FAST files are the same except
for optional FGRID boundary
reconnection, boundary condition, and
initial normal spacing data records.
.fluent.cas Fluent Grid File
A Fluent grid file contains a tria/quad
face boundary surface grid and a
polyhedral element volume grid.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
output files.
.fvuns Fieldview Grid File
A Fieldview grid file contains
boundary surface grid and (optionally)
a polyhedral element volume grid.
This file type may only be used for
output files.
.gambit GAMBIT (Fluent) Neutral File
A GAMBIT Neutral file contains a tria/
quad face boundary surface grid and
(optionally) a polyhedral element volume
grid.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
output files.
.mesh MESH 3D Unstructured Grid File
A MESH file contains a tria/quad face
boundary surface grid and (optionally)
a polyhedral element volume grid. Note
that pentahedral elements are supported
using the keywords Pentahedra5 and
Pentahedra6. The official MESH file does
not support pentahedral elements. This
file type is used by MEDIT.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
.bdf NASTRAN 3D Unstructured Grid File
A NASTRAN file contains a tria/quad face
boundary surface grid and (optionally)
a polyhedral element volume grid.
The suffix .nas and .bdf are equivalent.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
.nas NASTRAN 3D Unstructured Grid File
A NASTRAN file contains a tria/quad face
boundary surface grid and (optionally)
a polyhedral element volume grid.
The suffix .nas and .bdf are equivalent.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
.mcell NSU3D Grid File
A NSU3D grid file contains a tria/quad
boundary surface grid and (optionally)
a polyhedral element volume grid.
.foam OpenFOAM polyMesh Grid Files
A cellShape file contains a volume grid
that is comprised of points and
polyhedral elements defined by faces.
This file type may only be used for
output files.
.ufast UFAST 3D Unstructured Grid File
A UFAST file contains a triangulated
boundary surface grid and (optionally)
a tetrahedral volume grid. The UFAST
file type is identical to the FAST
(PLOT3D) unstructured grid file type.
.face TETGEN 3D Unstructured Grid File Set
A TETGEN file set contains a tria face
boundary surface grid and (optionally)
a tetrahedral volume grid. This file
type uses multiple files for coordinates
(.node), elements (.ele), and faces
(.face). This file type is used by
TetGen.
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
input files.
.ugrid UGRID 3D Unstructured Grid File
A UGRID file contains a tria/quad face
boundary surface grid and (optionally)
a polyhedral element volume grid.
This file type can use socket or TMP
file mode if a C binary double file
format is also used.
.cogsg VGRID 3D Unstructured Grid File
A VGRID file contains a triangulated
boundary surface grid and (optionally)
a tetrahedral volume grid. This file
type uses multiple files for coordinates
and volume grid connectivity (.cogsg),
boundary face connectivity (.bc), and
boundary conditions (.mapbc).
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
.efunc Ensight Gold Function File
An Ensight Gold function file contains a
data file. This file type assumes that a
grid data file will also be written out.
It also writes to an additional case
file (case_name.case).
This file type uses a fixed file format
that is either a standard ASCII file
format or a binary format specific to
the file type.
This file type may only be used for
output files.
.ufunc UFUNC 3D Function File
A UFUNC file contains a field function
(scalar and/or vector) data file.
This file type can use socket or TMP
file mode if a C binary double file
format is also used.