TYPE is used to indicate the intended status during stepping or
optimisation runs of thermodynamic parameters selected using MODIFY
INDEX. Parameters can be assigned fixed values (FIXED), flagged for
automatic change during stepping runs (STEPPED) or flagged for
automatic change during optimisation runs (OPTIMISED). Previous TYPE
settings can be cancelled using the UNCHANGED keyword.
that the value of the selected thermodynamic parameter should remain
FIXED during subsequent stepping and optimisation runs. It is often
used in combination with MODIFY VALUE to assign a new fixed value to a
chosen parameter. For example:
modify index 31 type fixed value -18456 !
the selected thermodynamic parameter such that, when the STEP_PARAMETER
command is issued, its value is STEPPED automatically between limits
determined by its SCALE, to determine the effect on calculated
properties (see LIST PROPERTY) from an EXPERIMENTAL_FILE (see DEFINE).
No more than two parameters can be STEPPED at one time.
modify index 7 type stepped scale 5000 !
OPTIMISED flags the selected thermodynamic parameter for automatic change during future optimisation runs. For example:
modify index 21 type optimised !
the effects of previous OPTIMISED, STEPPED or FIXED entries for the
selected thermodynamic parameter. The value of the parameter is
returned to that in the data input (.mpi) file.