Table 1: List of variables and parameters used in documentation
Symbol | Units | Physical description |
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| kg.kg | Mass of absorbed species per mass of rock grain material |
| symbolic | Chemical species in phase |
| m.L | specific reactive surface area for mineral |
| m | Longitudinal dispersivity of phase |
| m | Transverse dispersivity of phase |
| dimensionless | Biot coefficient |
| dimensionless | Biot coefficient that multiplies the porepressure term in the porosity. Usually equal to , but may be for fracture-flow |
| K | Volumetric coefficient of thermal expansion of the fluid |
| K | Volumetric coefficient of thermal expansion of the drained porous skeleton (ie, the porous rock without fluid, or which a fluid that is free to move in and out of the rock) |
| m.s | External force density acting on the porous solid. This could be gravitational acceleration, or a load-density from a platten |
| dimensionless | Index representing phase. For example, might parameterise liquid (), gas () and NAPL () |
| J.kg.K | Specific heat capacity of rock grains |
| Pa | Drained compliance tensor of the porous solid (ie, inverse of ) |
| moles per litre | concentration of species |
| J.kg.K | Fluid specific heat capacity at constant volume |
| J.kg.K | Fluid specific heat capacity at constant pressure |
| kg.kg | Mass fraction of component present in phase |
| m.s | Fluid dispersion tensor for species in phase |
| m.s | Longitudinal dispersion coefficient for species in phase |
| m.s | Transverse dispersion coefficient for species in phase |
| m.s | Molecular diffusion coefficient for component in phase |
| dimensionless | Kronecker delta, unity if , else zero |
| J.m | Energy density of the rock-fluid system |
| J.kg | Internal energy of fluid phase |
| dimensionless | Strain tensor of the porous solid () |
| dimensionless | Elastic strain tensor of the porous solid. The total strain |
| dimensionless | Plastic strain tensor of the porous solid. The total strain |
| dimensionless | exponent in rate expression |
| Pa | Drained elasticity tensor of the porous skeleton (ie, this enters the stress-strain relation when fluid is allowed to freely drain from the skeleton, or when the skeleton is dry) |
| dimensionless | Porosity of the solid |
| dimensionless | Volume fraction of mineral in solid |
| kg.s.m | Fluid flux. This is a sum of the advective (Darcy) flux, and a diffusive-and-dispersive flux |
| J.s.m | Heat flux. This is a sum of heat conduction through the rock-fluid system, and convection with the fluid |
| m.s | Acceleration due to gravity. It is a vector pointing downwards (eg ) |
| dimensionless | Activity coefficient of species in phase |
| J.kg | Specific enthalpy of fluid phase |
| Pa | Henry coefficient for species which describes the solubility of the species in the aqueous phase |
| mol.L.s | Mineral reaction rate |
| kg.m.s | Chemical precipitation and dissolution rate |
| dimensionless | Index representing species. For example, might parameterise water (), air (), and H (). It parameterises things that cannot be decomposed into other species, but can change phase. For instance, sometimes it might be appropriate to consider air as a single species, while at other times it might be appropriate to consider it to be a mixture of nitrogen and oxygen ( and , say) |
| m | Permeability tensor of rock |
| dimensionless | Relative permeability of phase . This is a nonlinear function of the independent variables. Often it is just a function of the phase's saturation, but with Klinkenberg effects it will be a function of the gas pressure too. In the single-phase, fully-saturated case it is unity |
| Pa | Bulk modulus of the drained porous skeleton. In the anisotropic situation |
| depends on reaction | equilibrium constant for secondary species in phase |
| Pa | Bulk modulus of the fluid |
| mol.m.s | Mineral rate constant |
| s | Radioactive decay rate of a fluid species |
| J.s.m.K | Thermal conductivity of the rock-fluid system (J.s.m.K kg.m.s.K). It is a tensorial quantity to allow modelling of anisotropic situations, and is a function of the rock and fluid-phase's thermal conductivities |
| J.s.m.K | Thermal conductivity of the rock-fluid system when aqueous phase saturation is zero |
| J.s.m.K | Thermal conductivity of the rock-fluid system when aqueous phase saturation is unity |
| kg.m | Mass density |
| Pa.s | Dynamic viscosity measured in Pa.s or kg.m.s. This is a nonlinear function of the independent variables |
| dimensionless | Fraction of plastic-deformation energy that becomes heat energy. Probably is correct |
| dimensionless | Stoichiometric coefficient of basis species in equilibrium reaction for secondary species |
| m | Spatial differential operator |
| dimensionless | mineral saturation ratio |
| Pa | Fluid porepressure |
| Pa | Measure of porepressure used in the effective stress. Often this is chosen to be |
| Pa | Langmuir pressure |
| moles per litre | Total concentration of basis species in phase |
| kg.m.s | Fluid source |
| mol.L.s | Source of chemical species |
| J.m.s | Heat source |
| kg.m | Fluid density |
| kg.m | Grain density of the rock (so that is the density of the dry porous rock) |
| kg.m | The mass-density of the fluid-filled porous solid |
| kg.m | Langmuir density |
| dimensionless | Saturation |
| dimensionless | Saturation of aqueous phase |
| Pa | Total stress. An externally applied mechanical force will create a nonzero , and conversely, resolving into forces yields the forces on nodes in the finite-element mesh |
| Pa | Effective stress |
| s | Time |
| K | Temperature |
| dimensionless | The phase tortuosity, which includes a porous-medium dependent factor and a coefficient |
| s | Langmuir desorption time constant |
| dimensionless | Exponent in rate expression |
| m.s | Deformation vector of the porous solid |
| m.s | Darcy velocity (volume flux) |
| m.s | Velocity of the solid = , where is the solid mechanical displacement vector of the porous solid |
| L.mol | molar volume |