## 9.5. Edit Run In Progress Command

You can edit the CCL definition of a CFX-Solver input file while the solver is running. The changes you make take effect when saved and the modified CCL is pre-processed for the flow solver. The modified CCL may take several iterations to be updated depending on system load, hardware and problem size.

These changes apply only to the run in progress, and do not affect the CFX-Solver input file that was used to begin the run (if one was used). Before the next outer-loop iteration begins, a backup file named `<iteration number>.bak` is written to the working directory. The backup file can be used to restart the run from the point at which the CCL definition was changed, if needed.

Only selected CCL parameters can be dynamically changed. A list of these parameters is in the RULES file. For details, see RULES File.

The Command File Editor can also be used to make changes to the CCL contained in a CFX-Solver input file. Changes, when saved, affect the edited CFX-Solver input file only, not any run in progress. For details, see Editing CFX-Solver Input Files.

To access the command file editor, select Tools > Edit Run In Progress or click .

Note: The Edit Run in Progress command is not available for simulations involving ANSYS Multi-field couplings or transient blade row modeling. This constraint exists for simulations involving ANSYS Multi-field couplings because of difficulties involved with updating the MFX settings in the ANSYS solver during the run.

Note: You must not change any references to regions while the CFX-Solver is running with topology simplification active; doing so would cause the solver to stop. For details on topology simplification, see the description for expert parameter `topology simplification` in Physical Models Parameters in the CFX-Solver Modeling Guide.

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