## Chapter 4: Creating Domain Decomposition Sets

To enable parallel processing the problem must be decomposed and the various sub-domains assigned to the available processors. Autodyn offers two ways of decomposition generation:

Manual

  The user manually creates domain decomposition sets that are associated with a particular model, and these are stored along with all other project data whenever the model is saved. Only Structured solvers can be decomposed manually.

Fully automatic

  This option is only available for models using unstructured solvers or a combination of unstructured solvers and Euler. Once this option is chosen, no further input is required by the user in terms of model setup.

The following sections give examples of how to setup different types of decompositions. Files containing the initial project setup can be found in the samples directory of the Workbench installation which is by default C:\Program Files\ANSYS Inc\v182\aisol\Samples\AUTODYN.

- Decomposing Structured Calculations
- Decomposing SPH Calculations
- Decomposing Unstructured Calculations
- Decomposing Euler-Lagrange Coupled Problems
- Fully Automatic Decomposition for Euler/Unstructured

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