[Opm] Issues with two phase upscaling

[Alun Griffiths]

Hi

I am trying to upscale the single phase OPM hummocky model to two phase flow using rock curves ignoring capillary pressure (ie Pc=0).  I added some PVT and initialization data to the ECLIPSE file then typed "upscale_relperm eclipse_file relperm_file" but got this error message:
"Error: J function 1 in rock file isotropic_rock.txt was not invertible"

I am assuming that I need "viscous limit" upscaling but the OPM Wiki page for this option is empty so am not sure what to do next.

Best regards

Alun Griffiths
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