Hi Bernd, thank you for looking into this.
I've attached the relevant equations from the paper (DOI: 10.23967/eccomas.2022.037 <http://dx.doi.org/10.23967/eccomas.2022.037> ). Equation (3) shows the PDE which is solved for weights psi (for this I am currently using a modified Darcy problem) with periodic boundary conditions. Equation (5) shows the upscaled conductivity matrix. Phi varies locally, ks and kg are constants. Best regards, Helena
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