# 7.15.1.9. Lubrication

Beta Capability

The lubrication modeling capability is under active development hence this equation should be used with caution.

Syntax

  Eq Lubrication 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 Reynolds’ Lubrication Equation.

Description

  The only admissible value for Dof is `LUBRICATION_PRESSURE`.

  The only admissible value for Interp is .

  Admissible values of Term_n are `MASS`, `DIFF`, and `BOUND`.

  With the exception of `XFER` these terms are described in Lubrication Equation.

  For problems with fluid-structural interactions, the lubrication equation needs to be defined on all blocks, including 3-D blocks adjoining the shell lubrication region. In order to accommodate this, there is an additional term, `DEF`, which applies the equation on adjoining 3-D blocks where this is used. The other terms should not be used on 3-D blocks. It is weighted so that it does not affect the residual on the shell blocks.

  The Meshpart must be an active shell 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 | –