## 3.5. Autodyn Variables

Autodyn uses the dynamic array allocation features available through Fortran 90/95. As such, there are no fixed limits on the size of the model that you can generate. However, your computing time may be greatly limited by such factors as your machine memory.

There are two basic types of data storage and access used in Autodyn depending on whether you are using the IJK based or Unstructured solvers. These are described in the sections:

- IJK Solvers
- Unstructured Solvers/Elements
- Notes About Autodyn Variables

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