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 # ansys.meshing.prime.FileIO

 Last update: 17.07.2025 

#### FileIO.write\_size\_field(file\_name, params)

Write a PyPrimeMesh size field (PSF) file to a file on disk.

- **Parameters:****file\_name**: Path to the size field file on disk.
    
    **params**: Parameters for writing the size field file.
- **Returns:**[`FileWriteResults`](ansys.meshing.prime.FileWriteResults.md#ansys.meshing.prime.FileWriteResults): Results from writing the size field file.
- **Return type:**[`FileWriteResults`](ansys.meshing.prime.FileWriteResults.md#ansys.meshing.prime.FileWriteResults)

### Notes

This method does not support Unicode paths.

### Examples

```pycon
>>> file_io = prime.FileIO(model=model)
>>> params = prime.WriteSizeFieldParams(model=model)
>>> results = file_io.write_size_field("/tmp/my_prime_sizefield.psf", params)

```