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.
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 ?
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.
Thank you for your answer.