7.6.12.12.2. Density

Syntax

Mass Balance Diffusive Flux [{of} SpeciesName] = Density ()

Scope

Aria Material

Summary

Mass balance diffusive term from porosity, mass diffusivity, mass fraction and density.

Description

If a tensor mass diffusivity $D_i$ is provided in the material model, the form of diffusive flux is

${\bf{J}} = -\phi D_i \cdot \nabla \rho_i$

where $\phi$ is the porosity.

If the mass diffusivity is given as a scalar $d_i$ then the diffusive flux is

${\bf{J}} = -\phi d_i \nabla \rho_i$

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