Solver Setting - Convergence

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Navigation: User Guide ➔ Menu Commands ➔ View ➔ Solver Settings ➔ Convergence

FS_Solver ProBal Convergence GlobalTear Tears TearTags Tolerances Analysis
Dynamic Method Scenario SS Monitor

Steady State (ProBal) Parameters

This section describes the parameters on the Convergence tab that are only displayed in a Steady State (ProBal) project.

  • The Convergence Tab covers all the information available in the Solver Status window.
  • The Convergence Tab offers more in-depth information about the solver status than the solver status window.
  • The solver status information can be accessed via this tab for reporting purposes.
Example Solver Status window:
Solverstatus93 03.png


Tag (Long/Short)

Input / Calc

Description

Convergence...
Settings (Some of these values can also be entered via Project - Solver Setup)
MaxIterations / MaxIters Input Maximum number of iterations SysCAD will solve for before it stops.
Iterations Display The number of iterations performed in the current run.
ConvergedItersReqd Input The minimum number of consecutive iterations the solved solution will hold for before SysCAD stops.
ShowErrorColumn Off The Error Column in the Solver Convergence Window will be hidden.
On The Error Column in the Solver Convergence Window will be displayed, and the error will be in fractions (as shown in the picture above Button Small 1.png).
On(Perc) The Error Column in the Solver Convergence Window will be displayed, and the error will be in percent.

Dynamic Parameters

This section describes the parameters on the Convergence tab that are only displayed in a Dynamic project.

  • The Convergence Tab offers in-depth information about the solver status.
  • The solver status information can be accessed via this tab for reporting purposes.

Tag (Long/Short)

Input / Calc

Description

Convergence...
Settings
MaxIterations / MaxIters Input Maximum number of iterations SysCAD will solve flowsheet for each step, before it moves on to the next step. (This value can also be entered via Project - Dynamic Setup - Tears)

Common Parameters

This section describes the parameters on the Convergence tab that are displayed in both Steady State (ProBal) and Dynamic projects.

  • The Convergence Tab offers in-depth information about the solver status.
  • The solver status information can be accessed via this tab for reporting purposes.

Note: Only Type=PipeTear are relevant in Dynamic projects, as these are the only convergence criteria for each step.

Tag (Long/Short) Input / Calc Description
Message.Frequency Only available in Build 139 or later.
Off Only available in Dynamic projects. Reporting of tears not being converged is off.
Continuous Continuous reporting of tears not being converged.
StoppedOrPaused Only available in Steady State projects. Tears not being converged messages will only be reported when model is stopped or paused.
StoppedOrIdling Only available in Dynamic projects. Tears not being converged messages will only be reported when model is stopped or idling.
BadStep.Messages Tickbox Only available in Build 139 or later. Only visible in Dynamic projects. Report Bad Step (not converged) messages to Messages Log in addition to Conditions window.
Criteria Counts
Criteria...
Type Count Active Busy Good Limit NoFlow Manual Off
PID Number of criteria Active or inactive.
Eg. If the PID controller is inactive, the PID active value will be lower than the count value
Busy or not solved.
Eg. If the PID controller is not solved, the busy value will be >0
Good or Solved.
Eg. If the PID controller is solved, the Good value will be >0
criteria values at limit.
Eg. If the PID controller output is at limit, the Limit value will be >0
criteria values with no flow. criteria in Manual
Eg. If the PID controller is placed in manual mode, the manual value will be >0
criteria Off
Eg. If the PID controller is switched off, the PID off value will be will be >0
FlashTrain
PipeTear
Total
Variable Counts
Vars...
Type Count Active Busy Good Limit NoFlow Manual Off
PID Number of variable, one per criteria Active or inactive.
Eg. If the PID controller is inactive, the PID active value will be lower than the count value
Busy or not solved.
Eg. If the PID controller is not solved, the busy value will be >0
Good or Solved.
Eg. If the PID controller is solved, the Good value will be >0
variable at limit.
Eg. If the PID controller output is at limit, the Limit value will be >0
criteria values with no flow. variable in Manual
Eg. If the PID controller is placed in manual mode, the manual value will be >0
variable Off
Eg. If the PID controller is switched off, the PID off value will be will be >0
FlashTrain
PipeTear Number of variables, many per criteria
Total Total Number of variables
Maximum variable Errors
Vars...
Type Max MaxTag
PID Maximum PID variable Error Maximum PID variable Error Tag
FlashTrain Maximum Flash Train variable Error Maximum Flash Train variable Error Tag
PipeTear Maximum Tear stream variable Error Maximum Tear stream variable Error Tag
Worst Maximum variable Error Maximum variable Error Tag
Solver Convergence
Converged Display Only visible in Steady State projects. A value of 1 indicates that the project is converged (solved), while a value of 0 indicates that it is not yet converged/solved.
Steps Display Only visible in Dynamic projects. The number of steps performed in the current run.
Steps.Good Display Only visible in Dynamic projects. The number of good (converged) steps performed in the current run.
Steps.Bad Display Only visible in Dynamic projects. The number of bad (not converged) steps performed in the current run.
Iterations Display The number of iterations the solver has completed in the current run (overall).
Iterations.Converged / ConvergedIters Display Only visible in Steady State projects. The number of iterations the solver has completed under converged conditions.
SolveTime Display The amount of time taken to solve the project.
SolveTimeStats Display Provides link to the Plant Model - Statistics tab.
Progress.Error / Prog.Error Display Only visible in Steady State projects. This is the Solver progress Bar for errors, when the bar is full, the project is solved. Indicated in the picture above Button Small 4.png.
Solver Convergence (Current Step)
Step.Iterations Display Only visible in Dynamic projects. The number of iterations the solver has completed in the current step.
Step.Converged Display Only visible in Dynamic projects. A value of 1 indicates that for the current step, the project is converged (solved), while a value of 0 indicates that it is not yet converged/solved.
 
Active Done Busy Progress
Criteria Number of Active Criteria
Active = Busy + Good + Limit + Manual
Number of criteria solved
Done = Good + Limit + Manual
Number of Criteria still solving Criteria solving progress bar, shown in picture above Button Small 2.png.
Variables / Vars Number of Active Variables
Active = Busy + Good + Limit + Manual
Number of Variables solved
Done = Good + Limit + Manual
Number of Variables still solving Variables solving progress bar, shown in picture above Button Small 3.png.
 
Criteria.GroupByArea Tickbox Only available in Build 139 or later. If enabled, the following table will be shown with criteria grouped by Area.
Area Cvgd Iters Active Done Busy Area
Criteria.AreaX A value of 1 indicates that the area is converged (solved), while a value of 0 indicates that it is not yet converged/solved. The number of iterations the solver has completed. The number of active criteria in the area. The number of criteria in the area which have been met (solved). The number of criteria in the area still to be satisfied (still solving). The name of the area.
 
Converge Variables
CvgNotes...
No State Type Target Value Error Fails Area Tag
Number: Worst Error Descending
Lists up to 20 variables.
State of the Variable Type of the Variable Target value of the variable Actual value of the variable variable error number of iterations variable failed to converge Only available in Build 139 or later.
The area the variable belongs to.
Variable Tag.
 
CopyCriteria Copy To Clipboard Button Copies selected lists from the Converge Variables table to the clipboard.

Options are:

  • State
  • Type
  • Error Descending
  • Fails Descending
  • Tag
  • Block



CopyVariables Copy To Clipboard Button
Criteria and Variable Counts
Done = Good + Limit + Manual
Active = Busy + Good + Limit + Manual
Count = Active + Off