Description

template<class Scalar>
class Dumux::DiffusivityConstantTortuosity< Scalar >

Relation for the saturation-dependent effective diffusion coefficient.

The material law is:

\[ D_\text{eff,pm} = \phi * S_w * \tau * D \]

with a constant tau.

The default value is 0.5, empirically obtained in Carman 1937: Fluid flow through granular beds [11] Additionally, Bear 1972 [9] mentions values 0.4 and in the range of 0.56 to 0.8.

Static Public Member Functions
static Scalar	effectiveDiffusivity (const Scalar porosity, const Scalar saturation, const Scalar diffCoeff)
	Returns the effective diffusion coefficient \(\mathrm{[m^2/s]}\) based on a constant tortuosity value.
template<class VolumeVariables>
static Scalar	effectiveDiffusionCoefficient (const VolumeVariables &volVars, const int phaseIdx, const int compIdxI, const int compIdxJ)
	Returns the effective diffusion coefficient \(\mathrm{[m^2/s]}\) based on a constant tortuosity value.

Member Function Documentation

◆ effectiveDiffusionCoefficient()

template<class Scalar>

template<class VolumeVariables>

Scalar Dumux::DiffusivityConstantTortuosity< Scalar >::effectiveDiffusionCoefficient	(	const VolumeVariables &	volVars,
		const int	phaseIdx,
		const int	compIdxI,
		const int	compIdxJ )

inlinestatic

Returns the effective diffusion coefficient \(\mathrm{[m^2/s]}\) based on a constant tortuosity value.

Parameters

volVars	The Volume Variables
phaseIdx	the index of the phase
compIdxI	the component index i
compIdxJ	the component index j

◆ effectiveDiffusivity()