Mesh_Motion

Syntax

Bc Diffuse For Mass_Balance [{of} SpeciesName | {in} MaterialPhaseName | {ls} {a | b | c}] {@ | at | for | on | over} Mesh Extent Name [Touching TouchingMeshExtent | Opposing OpposingMeshExtent] = Mesh_Motion [Using Data Specification Data Spec Name]

Summary

Moving boundary condition valid for Arbitrary Lagrangian-Eulerian (ALE) mesh motion in relative flux form.

Description

Applies the following boundary flux

- \int q \mathbf{\hat{u}} \cdot \mathbf{n} dS,

where \hat{u} is the mesh velocity and where the integrated scalar q depends on the equation. For the gas phase POROUS_ENTHALPY equation with a transported enthalpy = porous, q = \phi \rho_g h_g. Similarly, for the gas phase MASS_BALANCE equation, q = \phi \rho_g is the bulk mass density.

This flux boundary condition is automatically applied to the mass balance and porous enthalpy equations when the USE RELATIVE MASS FLUX porous flow option is turned on.

Parameter

Value

Default

{of}

{of | species | subindex}

–

SpeciesName

string

–

{in}

{in | material_phase}

–

MaterialPhaseName

string

–

{ls}

{levelset_phase | ls}

–

Mesh Extent Name

string

–

TouchingMeshExtent

string

–

OpposingMeshExtent

string

–

Data Spec Name

string

–