Setting up a 1D river simulation - how to configure the Times tab
  • 06 Nov 2022
  • 2 Minutes to read
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Setting up a 1D river simulation - how to configure the Times tab

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Note
To follow this guide, a 1D river simulation must be loaded and active. You must therefore initially Start a new 1D river simulation or Load a 1D river simulation.

In the Times tab of the 1D Simulation window, the simulation type and timing details must be provided.

1DRiverimages1dsimtimestab.PNG

The Simulation Type must be selected. By default, new simulations will be set to Steady (Direct) - this is particularly useful for creating Initial Conditions

We also recall these initial conditions could be used in, for example, an Unsteady (Fixed Timestep) simulation.

Select the simulation type required using the radio buttons provided. Further details on the options available here can be found in the Technical Reference section.

The Timing Details for the simulation also must be provided. In each case, click in the relevant field and type the value required. Don't forget to save any changes made. Fields available for the timing details are dependent on the simulation type selected, click a simulation type for further details.

Steady (Direct)

The Start Time must be provided, as an absolute value (time/date) or a relative time in hours. An absolute value (time/date) for Time Zero can be optionally specified. All other fields are disabled.


Steady (Timestepping)

The Start Time must be provided, as an absolute value (time/date) or a relative time in hours. The Timestep also must be provided, in seconds. An absolute value (time/date) for Time Zero can be optionally specified. All other fields are disabled.


Unsteady (Fixed Timestep)

The Start Time and Finish Time must be provided, as an absolute value (time/date) or a relative time in hours. The Timestep also must be provided, in seconds. The Save Interval can be adjusted - this is the frequency at which results are saved. An absolute value (time/date) for Time Zero can also be optionally specified. 


Unsteady (Adaptive Timestep)

This simulation type provides identical options to Unsteady (Fixed Timestep) described above, with the addition of two fields specifying a Minimum Timestep and Maximum Timestep, in seconds.


Boundary Mode

The Start Time and Finish Time must be provided, as an absolute value (time/date) or a relative time in hours. The Timestep also must be provided, in seconds. An absolute value (time/date) for Time Zero can also be optionally specified. 


For more advanced users, a Warm Up Time can also be provided if you have selected to Perform Warm Up Start (on the Options tab).

The .mmm file will be created when your simulation runs, and will contain the maxima, minima and mean values of all the main output variables. By default, these values are calculated from time zero to the the simulation finish time, however different Timing for mmm calculations can be specified. Further details can be found in the Specify mmm Times section.

The Toolbar provides functionality to Save the details provided so far to the simulation file, and to Close the simulation window. You can also Runyour simulation from here - recall you will want to also Configure the Files tab prior to running a simulation.


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