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Hello everyone,

Energy extraction can be modelled by using dragfo subroutine in Telemac2D.

1. I would like to know if it possible to to run a 3D model, and at the same time (using the same model) to run a 2D simulation with the dragfo subroutine? For example, I am interested to see the velocities at different depth, and at the same time would like to see the exergy extracted using the dragfo subroutine.

I notice that the option for Vertical Structures are not available in 3D dictionary. So does it mean I need to use 2 models (2D and 3D using the same domain) to achive my objective?


2. Energy extraction (e.g power) can be obtained by editing the Dragfo subroutine in Telemac2D. How can I find the power, or any other parameters (like average velocity) for 3D domain? Is there any subroutine that I can use/edit for this?


I appreciate if someone can guide me to the right direction.

Regards
Anas

Hello,

In 2D and the subroutine dragfo we take into account the depth-integrated aspect, hence the depth is a parameter. In 3D energy extraction can be done locally by using local head losses, and it is simpler. The head losses are treated in an implicit way, so the arrays S1U, S1V and S1W must be changed (they are usually set to 0). If your head loss is of the form -k*U**2 the value of S1U, S1V and S1W will be -k*sqrt(U**2+V**2+W**2). I do not remember in which subroutine it is done (is it source.f ?) but the minus sign must be checked, I am not sure because this head loss could be put directly in the left hand side of momentum equation, in which case there is no need of minus sign. I have already written a post on this subject.

Sorry to be vague, I am in Antananarivo with limited connection and no Telemac package installed.

With best regards,

Jean-Michel Hervouet