In a 12-meter-long straight channel, a gate with a pneumatic jack has been employed at about a meter before the butterfly outlet gate (used for adjusting the water height) so that it would be used to generate positive surge. When the gate is closed suddenly (in about 0.2 second), it causes an increase in the flow depth and thus conversion of the flow from steady to unsteady, the fact which results in wave progress. I would like to know whether this type of positive surge resulting from sudden closure of the gate (whether with an approximately 2.5 cm opening, or with a complete closure) could be modeled in a straight channel using Flow3D? what software program may be used for its simulation?
Best regards,
Maryam Akbari
(I did not understand the setup, it would be nice if you show a schematic in a figure, I assume it is a free surface flow with a gate and a wave generator at one end)
Surge* governing equations (water hammer equations) are special form of full 3D Navier-Stokes. They have the exact structure of 2D Saint Venant (SWE) and 2D Euler equations mathematically. Back to your question, yes you can model it with Flow3D, model 3D N-S equation with moving object module as a boundary and you wold capture the wave due to closure of the gate. If your problem is symmetric in the transverse direction you may solve it with 2D layered averaged N-S solver of Flow3D as well.
PS:
* Surge in the literature of pump and pipeline means "water hammer", it is not the "storm surge" in the literature of coastal engineering
Can anyone help me for positive surge simulation? From reading what was posted here, this seems to be a problem concerning Semantic Mnemonic structure. A device such as a pattern of letters, ideas, or associations that assists in remembering something is just the intrinsic properties of any kind of schematics. Good luck. Best, T.T.
Dear Dr. Kaveh Zamani ,
Thank you very much for your useful answer and guides. I'm going to simulate it using Flow-3D according to your valuable information. I attached a schematic figure of this set up here.
Best regards,
Maryam Akbari
Dear Mr. Sherajul Islam ,
Thank you very much for your suggestion.
Best regards,
Maryam Akbari
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