1. A computer-implemented method for deriving properties of a porous material, the method comprising: a first stage including: obtaining a first image of the porous material on a first scale, wherein the first image comprises a 3D image obtained from scans using physical signals; extracting a first network of pores from the first image; and deriving a first set of properties of the porous material using a first network flow modeling based on the first network; and a second stage including: obtaining a second image of the porous material on a second scale larger than the first scale; extracting a second network of pores from the second image; and deriving a second set of properties of the porous material using a second network flow modeling based on the second network and the first set of properties.