River-/Cauchy-type boundary?

Hi,

Is there a way to implement a Cauchy-type (aka third-/river-/transfer) boundary for flow in a horizontal 2D model ?
Basically, the flux is a function of the potential difference between the river and groundwater, and a term reflecting riverbed resistance.

Regards,

Olivier

Hi,

I have found the « box_3D_cauchy_areal.fem » FEFLOW model in « ogstools/tests/data/feflowlib » and was able to convert it to a prj-file following the « How to convert a FEFLOW model and simulate it in OGS » section of OGSTools documentation.
Apparently, FEFLOW third-/Cauchy-type boundary corresponds to a Robin-type boundary in OGS.
Am I right ?

Regards,

Olivier

Hi Olivier!

Yes, in OGS that type of boundary condition is called “Robin”.

You can find some documentation, here: OGS: [case] Robin

There are also some linked examples, but they are probably all extremely basic, just testing the bare correctness of the BC implementation.

Best regards,
Christoph

Hi Christoph,
Thank you for your answer.
Regards,
Olivier