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Guest Chris Nielsen

TUFLOW FV is cell centred

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Guest Chris Nielsen

Is TUFLOW FV cell centred? What does this mean?

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Guest Chris Nielsen

The cells (or elements) are the computational blocks of the finite volume approach used by TUFLOW FV. This means that TUFLOW FV uses a single bed level value assigned to each cell in its calculations, then produces output that is applicable for each cell (cell velocities are derived from the values across each cell face).

 

This in itself is not a problem. However, at present SMS only permits values to be assigned at nodes; the corners of the cells. Thus, when TUFLOW FV reads the 2dm file during a model simulation the cell centred bed levels are interpolated from the corner node values. Then, when writing output via the “datv” output format, TUFLOW FV interpolates cell centred results back into the corner nodes.

 

In many instances, this interpolation of both input bed levels and output results is not an issue. However, there may be instances where it is an issue. It is important to be aware of this constraint.

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Guest Chris Nielsen

Further to this discussion .....

 

An issue that often comes up is "unexpected" behavior in cases like road overtopping, or low flow conditions in channels, where the user expects the elevations assigned at nodes to be that applied in TUFLOW FV. For example, questions arise like "my road elevation is at 25feet, but water starts to flow over it at 24.8feet".

 

To address these issues we've been working on smarter ways to incorporate important hydraulic features. In particular, the use of the "cell elevation" file commands, where users can insert specific points, polylines or polygons representing important terrain features, has definitely improved the useability of TUFLOW FV. 

 

See the on this topic for more information.

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