Aqwa-Drift and Naut can accept forces calculated in an external routine, at each timestep. This is done by calling a routine called user_force, which is stored in a file called user_force.dll in the Aqwa installation directory. See External Force Calculation for a description of how to use this capability. Up to 200 control parameters (100 integers and 100 reals) can be passed to the user_force routine using the IUFC and RUFC data records described below.
Note: Although these data records can be entered under any structure number (denoted on the HLD* header for this data category), they are not specific to any particular structure. If the same parameter number is entered on two data records, even if they are under different structures, the second entry overwrites the first.
2 5 7 11 16 21 31 41 51 61
- --- -- ---- ----- ----- --------- --------- --------- --------- ---
|X| | |IUFC| | | | | | | ...
- --- -- ---- ----- ----- --------- --------- --------- --------- ---
|X| | |RUFC| | | | | | | ...
- --- -- ---- ----- ----- --------- --------- --------- --------- ---
| | | | | | | | |
| | | | | |------------------------------------------
| | | | | |
| | | | | |_(3)-(8)Up to 6 integer (IUFC)
| | | | | or real (RUFC) parameters
| | | | |
| | | | |_(2)Last parameter number (I5)
| | | |
| | | |_(1)1st parameter number(I5)
| | |
| | |_Compulsory Data Record Keyword(A4)
| |
| |_Optional User Identifier(A2)
|
|_Compulsory END on last data record in data category (A3)
These data records can be repeated until all the required parameters are defined.