Computing and Comparing Effective Properties for Flow and Transport in Computer-Generated Porous Media

Figure 25

Comparison of hydraulic and diffusive flows through a low porosity geometry comprised of randomly distributed squares: . (a, b) Fluid flow driven by . (c, d) Diffusive flow driven by from west to east. “Hot spots” of fastest moving hydraulic flow are evident in channel centers, while diffusive speeds are fastest along fluid-solid boundaries.

(a) Fluid speed

(b) Close-up of boxed region in (a)

(c) Diffusion speed

(d) Close-up of boxed region in (c)