ANSYS Fluent interpolation file — IP (.ip)

The IP format is the ANSYS Fluent interpolation file, storing one or more fields over a set of points, following FEconv.

Format name	ip
Extensions	.ip
Read / Write	✓ / ✓
Extra dependencies	—

Reading & writing

import meshioplusplus

field = meshioplusplus.read("field.ip")         # geometry-less Mesh
meshioplusplus.ip.write("out.ip", field)        # version-3 text

File structure

Version, spatial dimension, point count, component count, the component names, then a section of all values for each coordinate (x, y, and in 3-D z) and a section of all values for each field component. In version 3 each section is wrapped in (/); version 2 has no parentheses:

3
2
34800
3
x-velocity
pressure
y-velocity
(-0.068062
 -0.0680413
 ... )
( ... )

Data mapping

IP is read into a geometry-less Mesh (no cells) whose points come from the coordinate sections and with one point_data entry per field component. On write, a version-3 file is produced; multi-component point_data arrays are split into scalar component columns (named <key>_0, <key>_1, …).

Quirks & limitations

• Only text IP files (versions 2 and 3) are supported; binary variants (versions 4 and 5) are not.
• Fields are treated as nodal (points from the coordinate sections). Attaching the values to an element mesh (Fluent's barycenter convention) is left to the caller.

Notes

• Implemented against the FEconv format documentation (FEconv is GPL; no code or data is copied — fixtures are generated by round-trip).