## 31.1. User CEL Routines

Available when Option is set to `User CEL Function`, User CEL Routines are used in conjunction with User CEL Functions to define quantities in CFX-Pre based on a Fortran subroutine. The User CEL Routine is used to set the calling name, the location of the subroutine, and the location of the Shared Libraries associated with the subroutine.

1. Enter the Calling Name of the subroutine within the subroutine file.

   You should always use lowercase letters for this even when the subroutine name in the Fortran file is in uppercase.

2. Enter the Library Name and Library Path.

   The library name will usually be your subroutine filename (without any extensions). The library path is the path to the directory containing the system dependent directories and supports lists of paths. For details, see Library Name and Library Path.

User CEL Functions are created after the associated routine has been defined. For details, see:

- User CEL Functions

- User CEL Functions and Routines in the CFX-Solver Modeling Guide.

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