# Ale Reference System Group

Ale Reference System Group entities used to associate a geometric entity to a reference system type.

A geometric entity may be any part, part set, node set, or segment set of a model (or a collection of meshes). A reference system type refers to the possible transformation allowed for a geometric entity (or mesh). This command defines the type of reference system or transformation that a geometric entity undergoes. In other words, it prescribes how certain mesh can translate, rotate, expand, contract, or be fixed in space, and so on.

## LS-DYNA Cards

Card | Description |
---|---|

*ALE_REFERENCE_SYSTEM_GROUP | Defines the type of reference system or transformation that a geometric entity undergoes. |