User defined injection regions enable you to use Fortran to specify a custom injection region. The routine may optionally return a range of values (such as temperature, particle mass flow rate, and so on) or they can be specified by enabling the appropriate toggles in CFX-Pre. Information on setting up a particle routine is available in Particle User Routines in the CFX-Pre User's Guide.
Note: In the case of user defined injection, the particle position and the injection
velocity – if returned from the user routine – refer to the global
coordinate frame Coord 0 rather than to the one specified
under Coordinate Frame.
An example of a Fortran routine is given below. This routine returns the following variables:
Particle Position (X, Y, Z)
Particle Mass Flow Rate
Mean Particle Diameter
Velocity (u, v, w)
Temperature
As a result, the respective options under Define Particle Behavior are not entered. Similar to other routines, after the Fortran routine is written, a shared library should be created. For details, see Creating the Shared Libraries. The routine should then be defined as a User Particle Routine in CFX-Pre. For details, see Particle User Routines in the CFX-Pre User's Guide.
In the <install_dir>\examples\UserFortran
directory, you can find an injection routine,
pt_injection.F, and corresponding CCL template,
pt_injection.ccl.