The dialog "Dynamic Network Calculation" serves to input, modify and start dynamic network calculations. The regulations and the distribution of load for the calculation for a desired calculation period are set in this dialog.

The list of unsteady state network calculations also contains steady state calculations, so that a steady state calculation can be changed into an unsteady state calculation. The different tabs for the calculation defaults determined similarly to steady state network calculation, although there is also tab "Period". In addition, on the tabs "Pressure Maintenance", "Control", "Stations", "Load Prognosis" and "Isolation Valves", the default time can be selected.

• Period Tab – The tab "Period" permits the input of the calculation period as well as the calculation and settings step:
  
• From – When starting, first the creation date of calculation is displayed. The value can be changed using a special input field for date and time:
  
• To – End time of unsteady state calculation. Is currently automatically changed using the selected calculation duration.
• Duration – Calculation duration of unsteady state network calculation
• Calculation step size – Step size for the thermal hydraulic calculation steps. A smaller time step size usually leads to a somewhat higher accuracy of the calculation results; however, this will require more time to calculate will result in as a larger data set of calculation.
• Default step size – Step size for the calculation defaults. The temporal defaults for a feeder, load prognosis etc. are subsequently entered in this selected time step size.
• Selection default time – The time for the current calculation defaults can be selected on the tabs "pressure maintenance", "regulation", "suppliers", "load prognosis" and "barriers". The time is usually set in hours starting from the beginning of calculation in the selected calculation step size. The last value is the selected calculation duration less the calculation step size, since calculation defaults would no longer be effective on the last calculation time: