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Tutorial Module01 Archive: Difference between revisions

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<li>Set up the model directory and sub-directories as recommended in the list below (for a more detailed description , please seerefer the Folders and Filepath Section ofto the <u>[https://wwwdocs.tuflow.com/Tuflow%20Documentation.aspx%7CTUFLOWclassic-hpc/manual/latest/ UserTUFLOW Manual])</u>). Alternatively, you can copy the TUFLOW folder and all sub-folders from the TUFLOW Folders Template folder in the supplied files to a local drive on your computer.<br>
''* If using SMS, the folder structure listed above is automatically created before running the model using the "Export TUFLOW files" command (see <u>[[Run TUFLOW from within SMS|Run TUFLOW from within SMS]]</u>).
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=== Run TUFLOW to Create Empty (Template) GIS Files===
We now need to run TUFLOW using the TUFLOW Control File (TCF). There are a number of ways TUFLOW can be setup to run. In each case the TUFLOW executable is started with the TCF as the input. For more information on running TUFLOW please refer to the ''Managing and Starting Simulations'' section of the <u>[https://wwwdocs.tuflow.com/Tuflow%20Documentation.aspx%7CTUFLOWclassic-hpc/manual/latest/ UserTUFLOW Manual]</u>. The most common ways are outlined below. We will be using a batch file for this tutorial, however any of the methods below will work.
 
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=== Define Elevations ===
In the previous section, the extent and dimensions of the 2D domain were defined. We now need to assign elevations at each 2D cell centre, mid-side and corner. These points are known as Zpts.<br>
Knowledge of 2D domain geometry is fundamental to understanding how TUFLOW works. A brief description on the computational function of each of the Zpts in a TUFLOW cell is given in the <u>[[Zpt_Description | Zpt Description]]</u> page. It is also highly recommended to read the ''2D Model domain Schematisation'' Section of the <u>[https://www.tuflow.com/Tuflow%20Documentation.aspx%7CTUFLOW User Manual]</u>.<br>
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There are two methods to assign the elevations to the Zpts. The first is to directly input the elevation model into TUFLOW as either a TIN or gridded DEM dataset. TUFLOW will assign the elevations from the elevation dataset to Zpts within the DEM / TIN. This offers the following benefits:<br>
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The model performs better with a smaller cell size, as the 5m resolution is a bit too coarse for representing the narrow in-bank flowpath in a 2D manner. In Module 3 we will overcome this issue by modelling the creek using a 1D model, which will be dynamically linked with the 2D model.<br>
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It is worth noting the increase in runtime, by halving the cell size by a factor of 2, we have four times as many cells (each 5m x 5m cell is now four 2.5m x 2.5m cells), we also needed to reduce the timestep, as the Courant number is directly related to cell size (refer to the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW manualManual]</u>) this would normally be reduced by a factor 2 as well. This translates to an approximate increase in runtime of 8 (four times the number of cells and half the timestep). Choosing an appropriate cell size that allows representation of the hydraulics whilst resulting in realistic run times is an important part of the modelling process. With some planning you should be able to avoid a model that requires excessive run times!<br>
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The following Wiki page gives some guidance on <u>[[Estimating_Runtimes | estimating model runtimes]]</u> based on the model area and cell size.
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