Permeability and porosity parameters of a porous medium are known only in a statistical sense. For risk assessment, one must perform multiple ow simulations of a single site, varying these input parameters. Because multiple simulations of large sites are computationally prohibitive, upscaling from ne to coarse scales is necessary. Traditional upscaling techniques determine a new eeective or ups...

In a companion paper [Taron J, Elsworth D, Min K-B. Numerical simulation of thermal–hydrologic– mechanical–chemical processes in deformable, fractured porous media. Int J Rock Mech Min Sci 2009; doi:10.1016/j.ijrmms.2009.01.008] we introduced a new methodology and numerical simulator for the modeling of thermal–hydrologic–mechanical–chemical processes in dual-porosity media. In this paper we ut...

[1] We develop mathematical models to investigate anhydrite precipitation in hydrothermal recharge zones at ocean ridge axes. We first consider constant flow during hydrothermal recharge to estimate the depth, the depth interval over which anhydrite precipitation would occur, and the initial rate of porosity reduction. We find that the smaller the downward mass flux, the shallower and more broa...

The permeability of crushed coal bodies plays a bottom neck role in seepage processes, which significantly limits the resource utilisation. To study under pressure, particle size distribution body grains is quantitatively considered by fractal theory. In addition, parameters percolation characteristics are calculated. Moreover, during recrushing determined dimension and porosity. A lateral limi...

We consider a pressure-driven, one-dimensional, advective flow of a suspension through a porous domain. Suspended particles are filtered out, changing the porosity. These changes affect the filtration velocity through a porosity-dependent permeability factor. The reaction mechanism includes an accretion term and a term which allows trapped particles to return to the mobile phase. We obtain nume...

CAL: HIGH POROSITY ≠ HIGH PERMEABILITY P. A. Bland, M. D. Jackson, R. F. Coker, B. A. Cohen, G. K. Benedix. Impacts & Astromaterials Research Centre (IARC), Dept. Earth Sci. & Eng., Imperial College London, SW7 2AZ, UK. E-mail: [email protected]. IARC, Dept. Mineralogy, Natural History Museum, London SW7 5BD, UK. Los Alamos National Lab., Los Alamos, NM 87545, USA. Inst. Meteoritics, Universit...