How can I stop the solver gracefully from user Fortran in a transient run?

Set the logical data area /FLOW/ALGORITHM/CONTROL/NEXT_TSTEP to FALSE from
user Fortran. A complete working example is provided, which demonstrates this
method. See attached zip archive file and description below.


README This file
run.ccl CCL file for use with the -ccl option
solvercontrol.def Definition file
usr_stp_solver.F User Fortran source code


This example demonstrates how to stop a transient run of the solver from user
Fortran. In this case the criteria used to stop the solver is when a variable
falls within a specified range. In principle however, any criteria could be
used, the main purpose of the example being to demonstrate how to stop the

Stopping the solver in a transient run is actually very simple and is achieved
by setting the following LOGICAL data area to FALSE:


This data area controls whether the solver completes any more time steps and is
set using a call to POKEL as follows:


A working example is provided, which also writes a diagnostic message to the
output file when the solver is stopped.

The method outlined stops the solver 'gracefully'. It is sometimes necessary to
stop the solver immediately (e.g. in case of an error), in which case the
routine CFXSTP should be called.


- Open a command prompt/shell. If running on a Windows based machine, obtain
this from the CFX-5 launcher using 'Tools > Command Line'.

- Use the cfx5mkext command to create a shared library from the user Fortran
source code supplied with this example.

cfx5mkext -name scontrol usr_stp_solver.F

- Run the simulation using the CFX-5 solver. The command is:

cfx5solve -def solvercontrol.def -ccl run.ccl

Note that in this example, the library path is set to .. which is adequate
for a simple example run sequentially. For real cases, particularly when
running in parallel, it is strongly recommended to use an absolute path.

Note also that a similar example is available showing how to stop a steady
state simulation, which requires a slightly different procedure.
**** Entered By: dsclarke @ 05/08/2007 02:43 PM ****

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