The Simulation Editor combines all information necessary for MIKE 11 to perform a simulation. This information comprises type of model to run, name and location of input data files, simulation period, time step etc. and name of result files.
Figure 6.1: Simulation Editor of MIKE 11
The Simulation editor contains 5 property pages in which data must be specified.
Models property page
Select the models (HD, AD, ST, WQ etc.) to be included by activating the checkbox for the specific simulation model,
Additionally, you must select the simulation mode (Unsteady or Quasi steady simulation). If an encroachment simulation is to be made the encroachment checkbox must be checked.
Input property page
Specify the location of input files to be used in the simulation. The type of input files necessary for the simulation is identified by the colour of the edit fields. If the field is white the field can be edited and a file must be selected. If the field is grey (‘dimmed’) it is a non-editable field and the specific
input file is not required for the simulation. One exception though, is the edit field; ‘RR Results (*.RES11)’ which is used to specify an input file from the Rainfall Runoff simulation only. If you do not require any runoff input from a Rainfall Runoff simulation, this field should just be left blank. Input files can be located in any directory on the disk. Use the button to browse a specific input file in a file selection box.
If a filename has been specified in a filename field, you can use the button to open the file in its corresponding editor
Simulation property page
In the Simulation property page, information on the simulation period, time step and type of initial condition must be specified. Further the user can select if a fixed time step, a tabulated time step or an adaptive time step should be used or
There are two ways of specifying the simulation period:
1. Specify manually the simulation start and end time respectively. The date-format to be used for the simulation start and end time must be the same as Windows utilises (e.g. yyyy-mm-dd hh- mm-ss)
2. Press the button to let MIKE 11 automatically determine the minimum and maximum date and hour where all time series (defined in the boundary file) have common periods. The date and hour for start and end time respectively are then automatically inserted in the field.
If no common period exists for the time series defined in the boundary files, nothing happens and the value in the Start and End date fields are not modified.
After specifying the simulation period, the simulation time step must be defined. Specify a value for the time step and select the unit (days, hour, min, sec).
The Time Step multiplier for Rainfall Runoff (RR) and Sediment Transport (ST) modules can also be specified in case one of these models is selected.
The Time step multipliers are used to adjust the time step applied for these models. E.g. in ST- simulations it will often be necessary to run the Hydrodynamic.model using a much smaller time step than required in the ST model. That is, the time step used in the RR and/or ST model is therefore the multiplier-value multiplied the simulation time step.
Finally, specify the type of initial condition to use (steady state, hotstart, parameter file)
Type of Initial condition • Steady State:
MIKE 11 calculates automatically a steady state profile for the entire model, • Hotstart:
Initial conditions are read from results of previous simulation (define a result-file) • Parameter File:
Initial conditions are read from Input Parameter file (e.g. HD Parameter file).
Results property page
Specify the filename for results from the simulation.
Storing frequency can be used to decrease the size of result-files by reducing the number of time steps saved. (e.g. Storing frequency specified as 10 means that results are saved in the result-file for every 10 time-step only).
Start property page
In the Start property page you will find two validation groups. One group informing on the status of the simulation (are all input files required for the simulation specified? do the time series files used for boundary conditions have a common period – and is the simulation period within this period?). If a problem exists, a red light symbol is displayed in the validation group and it will not be possible to start the simulation. If all input files are satisfactory, a green light symbol is displayed and pressing the Start button starts the simulation.
6.2
Simulation Editor File – also a Simulation-Log
All information specified in the Simulation editor are saved in a Simulation editor file (*.sim11). The sim11 file is – as most of the other editor files in MIKE 11 – an ASCII text-file. It is therefore possible to view the content of these input files in any word processing program (like Notepad, Works, Word etc.).
Occasionally, it is required to go back in time and investigate results and/or input from previous projects, and it is therefore necessary to keep a log of the simulations performed (input files used, time step etc). If you are running several simulations (e.g. using different input files or simulation periods) it is therefore advisable to save the input for each simulation in a separate Simulation editor file.
Saving each simulation in separate simulation file you do not have to keep an additional, separate log of each individual simulation. Simply specify a name for the simulation files, which identifies the content of the file and eventually the purpose of the simulation.