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Simulate capillary pressure directly on CT scans of different materials (e.g., porous or composite materials) using the Capillary Pressure Module, which is part of Transport Phenomena Simulation Module for VGSTUDIO MAX.
The simulation of capillary pressure can be used to determine characteristics of scanned porous materials, for example in geosciences to characterize soil and rock samples.
The Capillary Pressure Module:
The pore size distribution is calculated using the approach of maximal inscribed spheres. The software uses spheres of varying size as probes and attempts to fit them into the pore space. For each point, the largest fitting sphere overlapping this point is found. The diameter of that sphere is assigned to this point as the local pore diameter.
For determining the capillary pressure curve, the software simulates a quasi-static drainage experiment. The sample is connected to two fluid reservoirs, a wetting phase (WP) and a non-wetting phase (NWP) reservoir, at user-defined sections of the volume boundary. The pore space is initially filled with WP. The pressure in the NWP reservoir is increased in discrete steps, resulting in injection of NWP into the pore space.
The Transport Phenomena Simulation Module provides four overlays for the visualization of the results in 2D and 3D:
The pore diameter is the diameter of the largest inscribed sphere.
The isolated pore space is the pore space that is not connected to either WP or NWP reservoir.
The non-wetting phase front is the space occupied by the NWP at a certain user-specified pressure.
The trapped wetting phase shows portions of the WP which are isolated from the WP reservoir. These portions are regarded to be trapped forming the residual WP.
Pore diameter histograms can be visualized. The porosity and the capillary pressure can be viewed as curve plots along a line connecting the WP and NWP reservoir planes in the normal direction. The capillary pressure curve displays the capillary pressure in relation to the WP saturation.
All curves can be easily exported using the .csv format.