---
name: "decomposePar"
section: "1"
platform: "linux"
package: "openfoam"
version: "1912.200626-3+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/decomposePar"
---

# decomposePar(1)

part of OpenFOAM (The Open Source CFD Toolbox).

## NAME

decomposePar - part of **OpenFOAM** (The Open Source CFD Toolbox).

## SYNOPSIS

**decomposePar** \[*OPTIONS*\]

## DESCRIPTION

```
Decompose a mesh and fields of a case for parallel execution
```

## OPTIONS

- **-allRegions**

  Operate on all regions in regionProperties

- **-case** *dir*

  Specify case directory to use (instead of the cwd)

- **-cellDist**

  Write cell distribution as a labelList - for use with 'manual' decomposition method and as a volScalarField for visualization.

- **-constant**

  Include the 'constant/' dir in the times list

- **-copyUniform**

  Copy any uniform/ directories too

- **-copyZero**

  Copy 0/ directory to processor\*/ rather than decompose the fields

- **-decomposeParDict** *file*

  Use specified file for decomposePar dictionary

- **-dry-run**

  Test without writing the decomposition. Changes -cellDist to only write volScalarField.

- **-fields**

  Use existing geometry decomposition and convert fields only

- **-force**

  Remove existing processor\*/ subdirs before decomposing the geometry

- **-ifRequired**

  Only decompose geometry if the number of domains has changed

- **-latestTime**

  Select the latest time

- **-noSets**

  Skip decomposing cellSets, faceSets, pointSets

- **-noZero**

  Exclude the '0/' dir from the times list

- **-region** *name*

  Specify alternative mesh region

- **-time** *ranges*

  List of ranges. Eg, ':10,20 40:70 1000:', 'none', etc

- **-verbose**

  Additional verbosity

- **-doc**

  Display documentation in browser

- **-help**

  Display short help and exit

- **-help-full**

  Display full help and exit

### ADVANCED OPTIONS

- **-debug-switch** *name=val*

  Specify the value of a registered debug switch. Default is 1 if the value is omitted. (Can be used multiple times)

- **-fileHandler** *handler*

  Override the file handler type

- **-info-switch** *name=val*

  Specify the value of a registered info switch. Default is 1 if the value is omitted. (Can be used multiple times)

- **-lib** *name*

  Additional library or library list to load (can be used multiple times)

- **-noFunctionObjects**

  Do not execute function objects

- **-opt-switch** *name=val*

  Specify the value of a registered optimisation switch (int/bool). Default is 1 if the value is omitted. (Can be used multiple times)

- **-doc-source**

  Display source code in browser

- **-help-man**

  Display full help (manpage format) and exit

- **-help-notes**

  Display help notes (description) and exit

## SEE ALSO

Online documentation https://www.openfoam.com/documentation/

## COPYRIGHT

Copyright © 2018-2019 OpenCFD Ltd.