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Difference in liquid and gas viscosity of MoMaS pdf and .prj file


I’m new to OpenGeoSys and have been attempting to model a pressurized gas leak into the shallow subsurface. It appears that the two-phase flow MoMaS benchmark for OGS6 is the most similar to what we are trying to model but I don’t understand where the liquid and gas viscosity values in the .prj file come from. The MoMaS benchmark pdf has the liquid viscosity as 10-3 Pas and the gas viscosity as 9 x 10-6 Pas but the .prj file has the liquid viscosity as 3.171 x 10-11 Pas and the gas viscosity as 2.8539 x 10-13 Pas. The model ran with the viscosity values already in the .prj file but the viscosity values were adjusted to the values in the .pdf the model no longer ran. Why aren’t the viscosity values in the .prj file equal to the viscosity values in the .pdf file?

Secondly, we were wondering if it is possible to run a two-phase flow process and a component transport process at the same time in OGS6 or would we have to run them separately? We haven’t found much help in the documentation on the ability apart from the Eclipise-Dumux 2phase_flow_2phase_tracertransport benchmark for OGS5.

Thank you,

Hi Bryce,

it’s because the time unit used in the .prj file is year, not second as in the .pdf file. This is also true for the diffusion coefficient.

Unfortunately it is not possible to run component transport and two-phase flow simultaneously in OGS6 at the moment. But there is a preliminary plan to couple the two processes this year, with the possibility of considering chemical reactions.