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While most reactive transport codes consider a single technique for the resolution of the partial differential equation some codes can adopt more than one. In Table 1 the supported discretization method and coupling strategies for different reactive transport codes are detailed.

Table 1

Supported discretization method and coupling strategies for different reactive transport codes

Code	PDE discretization¹	Transport and reaction coupling²	Phase conservation and transport coupling³
CORE	FEM	OS	SEQ
CRUNCHFLOW	FVM	OS, DS	COU
DUMUX	FEM, FVM, MFDM	OS, DS	COU, SEQ
HYDROGEOCHEM	FEM, MMC	OS, DS	ITER
HYDRUS-PHREEQC (HP1)	FEM	OS	SEQ
HYTEC	FVM	OS	SEQ
IPARS	MFEM, DGM	OS	INDP
NUFT	FVM	DS	SEQ
MIN3P	FVM	DS	SEQ
OPENGEOSYS	FEM	OS	SEQ
ORCHESTRA	MC	OS	INDP
PFLOTRAN	FVM	OS, DS	SEQ
PHAST	FDM	OS	INDP
PHREEQC	MC	OS	INDP
PHT3D	FVM, MMC	OS	INDP
RETRASOCODEBRIGHT	FEM	OS, DS	SEQ, ITER
RT3D	FDM	OS	INDP
STOMP	FEM	OS	SEQ
TOUGHREACT	FVM	OS	SEQ

Code	PDE discretization¹	Transport and reaction coupling²	Phase conservation and transport coupling³
CORE	FEM	OS	SEQ
CRUNCHFLOW	FVM	OS, DS	COU
DUMUX	FEM, FVM, MFDM	OS, DS	COU, SEQ
HYDROGEOCHEM	FEM, MMC	OS, DS	ITER
HYDRUS-PHREEQC (HP1)	FEM	OS	SEQ
HYTEC	FVM	OS	SEQ
IPARS	MFEM, DGM	OS	INDP
NUFT	FVM	DS	SEQ
MIN3P	FVM	DS	SEQ
OPENGEOSYS	FEM	OS	SEQ
ORCHESTRA	MC	OS	INDP
PFLOTRAN	FVM	OS, DS	SEQ
PHAST	FDM	OS	INDP
PHREEQC	MC	OS	INDP
PHT3D	FVM, MMC	OS	INDP
RETRASOCODEBRIGHT	FEM	OS, DS	SEQ, ITER
RT3D	FDM	OS	INDP
STOMP	FEM	OS	SEQ
TOUGHREACT	FVM	OS	SEQ

¹DGM, discontinuous Galerkin method; FDM, finite difference method; FEM, finite elements method, FVM, finite volume method; MC, mixing cell; MFDM, mimetic finite difference method; MFEM, mixed finite element method; MMC, modified method of characteristic.

²DS, direct substitution; OS, operator split.

³COU, coupled; INDP, independent; ITER, iterative; SEQ, sequentially.

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