# 7.15.1.20. Species

Beta Capability

The species equation is tested for low Reynolds numbers, but should be used with caution beyond that range.

Syntax

  Eq Species for Associated DoF [{of} SpeciesName | {in} MaterialPhaseName | {ls} {a | b | c}] {on} MeshPart using Interp with {Term_0} … {Term_N}

Scope

  Aria Region

Summary

  Activates the Conservation of Chemical Species equation.

Description

  The only admissible value for Dof is `SPECIES`.

  Admissible values of Interp are .

  Admissible values of Term_n are `MASS`, `LUMPED_MASS`, `ADV`, `DIFF`, `SRC`, `FRACBAL` and `XFER`. With the exception of `XFER` these terms are described in Conservation of Chemical Species. The `FRACBAL` term may not be included with other terms.

  Some other things to note about species equations in Aria:

  - The `FRACBAL` term may be assigned to any species number.

  - Species numbers in Aria are arbitrary; they may start at any value and need not be continuous.

  - For the species fraction balances, Aria will automatically detect all species that are present in the problem and include them in the balance.

  The Meshpart must be an active element block.

Parameter | Value | Default
--- | --- | ---
{of} | {of | species | subindex} | –
SpeciesName | string | –
{in} | {in | material_phase} | –
MaterialPhaseName | string | –
{ls} | {levelset_phase | ls} | –
Associated DoF | string | –
{on} | {@ | at | for | in | on | over} | –
MeshPart | string | –
Interp | string | –
{Term_n} | See Description | –