Solver Setting - Integration

Warning! Page you're reading is outdated or was archived and very likely is referring to older version of the software. Please navigate to the most recent version instead.

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

---

This page is for Build 138 or earlier. For Build 139 or later, please see Solver Setting - Method.

Tag (Long/Short)	Input / Calc	Description
Dynamic Solver Settings
RealTime.On	Tickbox	SysCAD will solve the model at a speed relative to the time on your PC. If the RealTimeMultiplier is set to 1 (100%), then it will take 1 second of running time to simulate 1 second of real time.
RealTime.Multiplier	Input	Multiplier of time when using the RealTime option. If the RealTimeMulitplier is set to 2 (200%), then it will take 1 second of running time to simulate 2 seconds of real time.
StepSize	Input	The size (time) of each step. A higher value results in a faster relative speed, but generally a less accurate solution. The maximum step size that can be used is dependent on the dynamics of process (relative flow rates, volumes of units, timing of events, etc.). A single step can have multiple iterations to solve the flowsheet and associated controls, similar to solving a steady state project. The maximum number of iterations per step is set on the Tears tab .
StepsPerUpdate	Input	Determines how many steps will be solved before the number displays in trend windows and so on are updated (or stored in historian). Generally the number of Steps per Update is set to 1 so that the number displays are updated at the end of each step.
Integration
Method	Input	The method used for the dynamic simulation can be changed here. Euler Runge-Kutta 2 Runge-Kutta 4
TimeInc.Control	Input/Display	Only the Fixed option can be selected.
TimeInc.Max	Input/Display	Maximum step size.
TimeInc.Min	Input/Display	Minimum step size.
Mag.RelTol	Input/Display	Relative tolerance. Can only be changed with the Runge-Kutta 4 method.
Mag.AbsTol	Input/Display	Absolute tolerance. Can only be changed with the Runge-Kutta 4 method.
IntSafety	Input
DerivEstInc	Input
SettleTime	Input
GrowLimit	Input
Grow	Input
OKShrinkLimit	Input
OKShrink	Input
BADShrink	Input