Geologic media in STOMP-W is considered to be slightly compressible. Compressibility is considered to be an intrinsic property of a rock/soil type. Compressibility can be specified via three options:
Either or both of the following options can be used with any of the Compressibility Options.
Tortuosity functions are required for simulations that involve solute transport or diffusion of components through phases (e.g., water vapor diffusing through the gas phase or dissolved oil diffusing through the aqueous phase). Tortuosities can be computed either as:
Dandekar, A. Y., 2006. Petroleum Reservoir Rock and Fluid Properties. CRC Taylor & Francis, ISBN-13: 978-0-8493-3043-8.
Marshall, TJ. 1959. The diffusion of gases through porous media. J. Soil Sci., 10, 79–82.
Millington, RJ. and JP Quirk. 1959. Permeability of porous media. Nature 183:387-388.