Simulation phases

Simulation time-step phases

The steps below outline the phases of execution in a standard Source run. A more detailed series of steps, along with their explanation can be downloaded here.

The phases of execution followed in a standard run are:

1. Start the simulation time-step.
2. Read and Assign input values from a time series for the current time-step. For example, if the data source for an inflow node is a time series, then a value is read from the time series corresponding to the current time-step and assigned to the inflow node.
3. Start River Operations: This overrides the values assigned from the input time series from the tabular view.
4. Start the forecasting phase: Run the forecast models which do not use functions.
5. Evaluate functions and modelled variables - where Time of Evaluation equals Start Of TimeStep
6. Continue forecasting phase: Run the forecast models which do use functions.
7. River Operations override functions and forecast values: If River Operations is used, then:
   1. Override the values generated by functions.
   2. Override the values generated by forecast models.
8. Plugins: All valid Source plugins will be notified before each simulation time-step is run.
9. Resource Assessment Phase
   1. For each Resource Assessment System
      1. Evaluate functions and modelled variables - where Time of Evaluation equals Resource Assessment.  
      2. Process Resource Assessment System.
         
10. Ordering phase:
    1. Evaluate functions and modelled variables - where Time of Evaluation equals Order Phase and where the function is not used at a network element.
       
    2. Process Water Users:
       1. For each Water User:
          1. Evaluate functions and modelled variables - where Time of Evaluation equals Order Phase, and where the function is used at this Water User.
             
          2. Calculate and distribute the demands of each Water user.
    3. Constraint Phase:
       1. For each Network Element:
          1. Calculate minimum and maximum constraints at each element and pass the constraints downstream.
    4. Ordering Phase:
       1. For each Network Element:
          1. Evaluate functions and modelled variables - where Time of Evaluation equals Order Phase, and where the function is used at this network element.
          2. Calculate regulated orders and pass upstream.
          3. Calculate off allocation orders and pass upstream.
11. Flow Phase
    1. Evaluate functions and modelled variables - where Time of Evaluation equals Flow Phase and where the function is not used at a network element.
       
    2. For each Network Element:
       1. Evaluate functions and modelled variables - where Time of Evaluation equals Flow Phase, and where the function is used at this network element
       2. Water Ownership - pre-timestep calculations
       3. Off Allocation: Generate additional release requests
       4. The wetland cluster that the element belongs to is solved for this time-step.
       5. Execute element flow phase calculations
       6. Water Ownership - post-timestep calculations, and colouring of water
       7. Calculate Constraint Factors for element
       8. Constituent modeling is executed.
12. Evaluate functions and modelled variables - where Time of Evaluation equals Post Flow Phase.
13. Resource Assessment Post TimeStep Phase.
14. Finalise constituent modeling (marker routing).
15. End of the forecasting phase.
16. Evaluate functions and modelled variables - where Time of Evaluation equals End of TimeStep.
17. Evaluate modelled variables - where Time of Evaluation equals Post Function Evaluation.
    
18. Recording phase: Writes the current time-step results to the requested recorders.
19. Plugins: All valid Source plugins will be notified after every simulation time-step is run.
20. End of the simulation time-step.