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Advection solver

Hi everyone,
Can anybody tell me which advection solver is used in opengeosys? Finite difference, TVD, MOC, MMOC or HMOC? And is there any way to define the solver for a model? I didn’t find any information on ogs5 keywords website. Thanks in advance.
Best wishes,

Hi Haoyue,

ogs5 uses finite-elements. Specifications are defined in the *.num file.

Him Johannes,
Thanks. I also have a question for the solver method in NUM file. There are 10 methods there. And I try to google them online but can not find them all. As there are both implicit FEM and explicit FEM, I’d like to know which of them belong to implicit and which of them belong to explicit. If possible, is there any details about these methods?