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TOPIC: How to compute a discharge rate along a section using I/J ?

How to compute a discharge rate along a section using I/J ? 8 years 1 month ago #23974

  • tivincent
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Hello !

In my result files, i have the two components of the discharge along X and along Y (I and J). The units is indicated as "m2/s".

I do not understand these variables : the units in m2 refers to which "area" ? is it the flow accross the section of one element ?

As my simulation is in 3D, I would like to integrate the discharge over a vertical section in order to compute the volume exchanged.
I would like to do it with Python.

Thanks for your help in understanding these variables :)

Vincent
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How to compute a discharge rate along a section using I/J ? 8 years 1 month ago #23978

  • josekdiaz
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Dear Vincent,

Disclaimer: I've never used Telemac3D.

In TELEMAC2D I,J represent the exact same as the components of the velocity multiplied by depth in that node ( [U*Depth] and [V*Depth]), making an integration along a line and taking into account the direction of the flow, gives the net "flow discharge" through a section.

Recalling that Tele3D works in a plane system ...Wouldn't I and J would represent the exact same (component*vertical distance*length ponderation based on distance to plane above and below) for each plane?

Integrating all vertical (sum operation, taking into account direction of vectors and cross section), and horizontal too(multiplying for adjacent distance in horizontal plane) would result in the net flow.

Regards,

José D.
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