7.6.12.11.6. Single_Phase

Syntax

Mass Balance Advective Flux [{of} SpeciesName] = Single_Phase ()

Scope

Aria Material

Summary

Provides the mass balance advection term for a given species $i$ and phase $p$ .

Description

For species $i$ , phase $p$ this model provides the advective term for the mass balance equation. By default, the non-relative form is used

$\mathbf{m}_{i, p} = \rho_{i, p} \mathbf{u}_{p},$

where $\rho_{i, p}$ is the species density, and $\mathbf{u}_{p}$ is the velocity for the given phase. The non-relative form is applicable to cases with or without mesh motion. If mesh motion is detected, the mass balance equation will automatically include an appropriate volumetric mesh motion correction term to correct the advective term.

If the use relative mass flux porous flow option is active and mesh motion is detected, the following relative advective form is used for phases other than the solid phase (e.g., liquid / gas)

$\mathbf{m}_{i, p} = \rho_{i, p} \left(\mathbf{u}_{p} - \phi S_{p} \hat{\mathbf{u}}\right),$

where $\phi$ is the porosity, $S_p$ is the optional phase saturation, and $\hat{\mathbf{u}}$ is the mesh velocity. If an optional phase saturation is provided, the pore volume is assumed to be occupied by multiple phases (e.g., liquid, gas) in accordance to their saturations.

Lastly, if applied to the solid phase, the relative mass flux form drops the porous mesh scaling resulting in the following relative mass flux

$\mathbf{m}_{i, s} = \rho_{i, p} \left(\mathbf{u}_{s} - \hat{\mathbf{u}}\right).$

Parameter	Value	Default
{of}	{of \| species \| subindex}	–
SpeciesName	string	–