[PL] RichardsComponentTransport: Documentation.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/c_RichardsComponentTransport.md

+\copydoc ProcessLib::RichardsComponentTransport::RichardsComponentTransportProcess

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/porous_medium/i_porous_medium.md

+The id of the porous medium as an integer between 0 and the number of material
+groups minus one. There must be a corresponding data array 'MaterialIDs' in the
+mesh file.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/porous_medium/porous_medium/a_id.md

+It specifies the material ID of a porous medium. The material IDs of elements
+must be given in the mesh's cell data array "MaterialIDs".

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/porous_medium/porous_medium/i_porous_medium.md

+A tag for the properties of a porous medium with material ID.
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Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/porous_medium/porous_medium/t_capillary_pressure.md

+Capillary pressure model.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/porous_medium/porous_medium/t_permeability.md

+A tag for the relative permeability model of a porous medium.
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Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/porous_medium/porous_medium/t_porosity.md

+A tag for the porosity model of a porous medium.
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Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/porous_medium/porous_medium/t_relative_permeability.md

+A tag for the relative permeability model.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/porous_medium/porous_medium/t_storage.md

+A tag for the storage model of a porous medium.
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Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/process_variables/i_process_variables.md

+The process variable for pressure and concentration.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/process_variables/t_concentration.md

+Process variable name of temperature.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/process_variables/t_pressure.md

+Process variable name of pressure.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/t_decay_rate.md

+The decay rate \f$\vartheta\f$ used in the transport process.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/t_fluid.md

+Defines fluid properties.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/t_fluid_reference_density.md

+Parameter for the specification of the reference density of the fluid.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/t_molecular_diffusion_coefficient.md

+Molecular diffusion coefficient \f$D_d\f$ used to compute the hydrodynamic
+dispersion tensor.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/t_retardation_factor.md

+Parameter for the specification of the retardation factor.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/t_solute_dispersivity_longitudinal.md

+The longitudinal dispersivity of chemical species \f$\beta_L\f$ used to compute
+the hydrodynamic dispersion tensor.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/t_solute_dispersivity_transverse.md

+The transverse dispersivity of chemical species \f$\beta_T\f$ used to compute
+the hydrodynamic dispersion tensor.

Documentation/ProjectFile/prj/processes/process/RichardsComponentTransport/t_specific_body_force.md

+Specific body forces applied to fluid.
+
+It is usually used to apply gravitational forces.