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 # write\_size\_field

 Last update: 02.04.2026 

<a id="ansys.meshing.prime.FileIO.write_size_field"></a>

#### 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)

```