1D Syphons: Difference between revisions

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Line 9: == 1D Configuration == ~~There~~Whilst TUFLOW does have a specific syphon channel, 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 5.8.1 ''M Channels (User Defined Flow Matrix)'' in the, <u>[https://downloads.tuflow.com/TUFLOW/Releases/Latest/TUFLOW%20Manual.pdf TUFLOW user ~~Manual~~manual]</u>. AnA 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~~M channel matrix ~~w10~~.jpg~~\| 600px~~]] === Storage Nodes & Additional Losses === Line 21: ==== Syphon Losses ==== ~~The~~For this method, the main losses for a syphon ~~are~~should be considered: * 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 ~~losses~~loss eqn.jpg]]▼ The following figure provides loss values for common bend types: ▼ Where: <br> ▲[[File:Bend losses.jpg]] '''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>) ▲The following figure provides ~~loss~~bend coefficient values for common bend types: [[File:Bend losses 1.jpg \|thumb\|none\|upright=5\|Table 8-4, Fluid Mechanics: Fundamentals and Applications 4th ed.(2018)]]<br> If you have any further questions about syphons or any other aspect of TUFLOW functionality, please email TUFLOW support: [mailto:support@tuflow.com?Subject=TUFLOW%201D%20weirs%20help support@tuflow.com] {{Tips Navigation \|uplink=[[ TUFLOW 1D Channels and Hydraulic Structures \| Back to 1D Channels and Hydraulic Structures]] }}