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Hello

I'd like to model the flow dynamics in a stilling basin at the outlet of a pressure tunnel with a spherical profile. The geometry of the stilling basin is designed such that a submerged hydraulic jump is expected.

For the regulation of the planned structure two gates separated by a pillar are required. Since Telemac3D is only able to model free surface flow, the flow out of the tunnel has to be implemented through some boundary condition, where the inflow at some points is specified and the rest is set to zero.

Does this make sense to implement such a boundary condition? Or would it be possible to include the last 10m of the pressure tunnel in the model to validate the result?

Thanks for your help!

Fabian

Hello,

You can put your boundary condition after the submerged hydraulic jump so that all the domain has a fluvial regime (in this case prescribed velocity and free water depth), or you can roughly model the tunnel as a square with prescribed velocity and depth, but in this latter case you may have to tune the velocity to get the right discharge (the prescribed depth will replace the continuity equation at the boundary, so the discharge effectively entered into the domain may be different from the expected value velocity * section).

With best regards,

Jean-Michel Hervouet