18.3.3. I/O Control Parameters

General I/O Control
`algebraic variable restart option`
Type	Integer
Default Value	1
Description	When restarting a run, and depending on the selected option, the values of each algebraic Additional Variable (Additional Variable using the Algebraic Equation option) are established by either one of the following methods: Reading from saved data Saves computational time at the restart Definition changes for algebraic Additional Variables are not immediately reflected in the restarted run, leading to discontinuities in the Additional Variable values at the time of restart. Recomputing Properly supports definition changes for algebraic Additional Variables Does not support recursive definitions for algebraic Additional Variables because saved data would be required but not read The options are: `1` = Automatic Option `1` is effectively a blend of options `2` and `3`. Upon restart, the CFX-Solver recomputes values for certain algebraic Additional Variables: Those that are based on profile functions Those that are a function of the initial mesh coordinates Those that are a function of the current mesh coordinates, for cases where there is no mesh deformation. Upon restart, the CFX-Solver reads values for other algebraic Additional Variables. When using option `1`, the algebraic Additional Variables that are read should have unchanged definitions and are permitted to involve recursion. `2` = Read algebraic Additional Variables data upon restart Option `2` uses minimal computational time to restart. Upon restart, the CFX-Solver reads values for all algebraic Additional Variables. Certain algebraic Additional Variables are not updated during the solution process: Those that are based on profile functions Those that are a function of the initial mesh coordinates Those that are a function of the current mesh coordinates, for cases where there is no mesh deformation. When using option `2`, all algebraic Additional Variables should have unchanged definitions. Note: Releases prior to release 2022 R2 effectively use option `2`. `3` = Recompute algebraic Additional Variables data upon restart Option `3` best handles definition changes for algebraic Additional Variables. Upon restart, the CFX-Solver recomputes values for all algebraic Additional Variables. When using option `3`, algebraic Additional Variable definitions are not permitted to involve recursion because saved data would be required but not read. Note: Release 2022 R2 effectively uses option `3`.
`include pref in forces`
Type	Logical
Default Value	f
Description	If set to `'t'`, the solver will account for the specified reference pressure in the force and moment calculation.
`mcf concentrations output option`
Type	Integer
Default Value	2
Description	Controls the output of mass concentrations, molar concentrations and molar fractions to the results file. 0 = Determine what data to write from the VARIABLES file (or CCL) 1 = Do not write this data 2 = Do not write this data for mixture fraction based models, and do write this data for other combustion models or no combustion model 3 = Always write this data To achieve full backwards compatibility with version 10.0, set this parameter to 3. Note that, in the case of a large number of components (>20), the computational cost of writing the data may be unacceptably high.
`read boundary flows`
Type	Logical
Default Value	f
Description	When set to `'t'`, the solver reads in boundary flows from the initial values when restarting from a previous run. This helps with smooth restart of cases with user function CEL expressions involving forces or boundary flows.
Backup Results
`backup file at start`
Type	Logical
Default Value	f
Description	Controls whether a backup file is written at the start of every run (that is, showing the initial values field for the run). Mass flow information written to a backup file at the start of the run is not accurate. To calculate accurate mass flow from a backup file, use information from the backup file written after the first timestep/iteration of the run.
`backup file at zero`
Type	Logical
Default Value	f
Description	Controls whether a backup file is written after zero timesteps (that is, showing the initial guess field for the run). Mass flow information written to a backup file at time zero is not accurate. To calculate accurate mass flow from a backup file, use information from the backup file written after the first timestep/iteration of the run.
Transient Results
`mfloip to trn files`
Type	Logical
Default Value	f
Description	When set to `'t'`, integration point mass flows are written to transient files (`*.trn`). This will ensure numerically consistent mass flow evaluations when postprocessing transient files.
Output File and Monitor Data
`always output post processing`
Type	Logical
Default Value	f
Description	When this parameter is set to `'t'`, flow summaries, variable ranges, forces, moments and scales are written to the CFX-Solver Output file on intermediate adaption steps.
`fmu logging`
Type	Logical
Default Value	f
Description	This expert parameter controls whether logging information provided by an FMU is written to the standard output of a CFX-Solver run. The amount of logging information is controlled by the FMU.
`monitor digits`
Type	Integer
Default Value	8
Description	Controls the number of digits used in the MON file. Increase the value to increase the precision of the results reported.
`monitor ftrans`
Type	Logical
Default Value	f
Description	When this parameter is set to `'t'`, false transient information (steady-state only) is written to the CFX-Solver Output file for each coefficient loop.
`monitor fmu`
Type	Logical
Default Value	f
Description	This expert parameter controls whether the values of all FMU input and output variables and parameters are written to the CFX-Solver Output file of a CFX-Solver run whenever the FMU is called.
`monitor ranges`
Type	Logical
Default Value	f
Description	When set to `'t'`, outputs variable ranges for each coefficient loop in a steady-state simulation or for each timestep in a transient simulation.
`monitor scales`
Type	Logical
Default Value	f
Description	When set to `'t'`, outputs variable scales for each coefficient loop in a steady-state simulation or for each timestep in a transient simulation.
`wall clock time`
Type	Logical
Default Value	f
Description	Output wall clock time at the start of each outer loop in a steady-state run or timestep loop in a transient run and in the summary at the end of the run.