network modeling becomes more widely used in real
engineering problems, we will see added complexity in the
shapes of simulation domains and in the boundary
conditions that need to be imposed during flow modeling. A
good example is the propped fracture shown on the right.
The network structure (of the sphere packing) must conform
to the geometry of the bounding walls, and if there is
fluid exchange across the fracture walls, this needs to be
reflected in boundary conditions imposed during flow
Network generation for complex
boundaries is relatively straightforward for algorithms
that operate on voxel images. However, modeling complex
boundaries will be most important for the algorithms that
operate on computer-simulated structures (such as sphere
packings) because of the limited size of voxel data sets.