1D Syphons: Difference between revisions
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There are two approaches to model a syphon system in TUFLOW.
=== Matrix Flows ===
The most appropriate approach to model a syphon is to use a M channel, described in Section 5.8 in the Manual. An M channel can be used to define a matrix of flows between two invert levels based on their respective depths. If this matrix of flows through the syphon can be calculated, or if they are given as part of the operational instructions, then they can be input in .csv form as below, where negative values indicate flows going from downstream to upstream.
[[File:Syphon matrix w10.jpg| 600px]]
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==== Syphon Losses ====
* entry and exit losses
* friction at pipe and wall
* bend losses
Bend losses (or any extra loss) through the syphon can be accounted for using the Form_Loss attribute of the pipe.<br>
The equation used for the loss of head due to pipe bend is provided below:
[[File:Bend loss eqn.jpg]]
The following figure provides loss values for common bend types: ▼
Where: <br>
'''k<sub>b</sub>''' = co-efficient of bend <br>
'''v''' = velocity of fluid (m/s)<br>
'''g''' = acceleration of gravity (9.8 m/s<sup>2</sup>)
[[File:Bend losses.jpg]]
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