TUFLOW FV Mesh Performance

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Mesh performance can be reviewed by opening a timstep summary output file created by TUFLOW FV in SMS.

Open the external cfl timestep file (<simulation name>_ext_cfl_dt.csv) in SMS. The file is located in the TUFLOWFV\input\log\ directory:

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When prompted for a format to open the file, select “use import wizard”.

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In the file import options select “Delimited” and select comma as the delimiter.

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At the next prompt, turn off the triangulate data, and using the dropboxes, set the ctrd_x data to be mapped as X, the ctrd_Y to be mapped as Y and the dt_min (minimum timestep) to be mapped as Z. This is shown in the dialogue below:

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Select “Finish” to open the data. There will be a new scatter dataset created, in the display options set the points to be visible, and select “Use contour colour scheme”.

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In the contour options, set the contour range to highlight the cells with small timesteps:

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The timesteps should now appear as a series of points, as per the image below. This can be used to identify the cells that are limiting the timestep of the model. In this case the limiting cells are in the deep water around the bends in the model. To increase the speed of the model we would need to relax (coarsen) the mesh definition in these areas.

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