Using IRIS Explorer in pore-scale simulations of fluid flow. (a) Creating a sphere pack by “dropping” particles at randomly chosen locations. The shaded volume is searched for the lowest position. (b) The network of nodes (green) and channels (pink) found in the sphere pack. The rendering uses simple primitives (cones) to approximate some of the geometrical information encoded in the pyramid. (c) Multi-phase fluid flow through the network. Yellow fluid has displaced purple fluid in parts of the channels. Nodes, containing a mixture of the two phases, are colored according to pressure. (d) The same network as in (c), but now with all parts (nodes and channels) colored according to pressure (see legend).