# 7.13.1.8.29. Van_Genuchten_Bc

Syntax

  Bc Dirichlet For Dof Name [{of} SpeciesName | {in} MaterialPhaseName | {ls} {a | b | c}] {on} Mesh Extent Name [Touching TouchingMeshExtent | Opposing OpposingMeshExtent] = Van_Genuchten_Bc [Using Data Specification Data Spec Name] Wetting_Saturation_Expression_Name = wetting_saturation_expression_name

Summary

  A Van Genuchten model for air/water capillary pressure based on an arbitrary function for wetting phase saturation

Parameter | Value | Default
--- | --- | ---
Dof Name | string | –
{of} | {of | species | subindex} | –
SpeciesName | string | –
{in} | {in | material_phase} | –
MaterialPhaseName | string | –
{ls} | {levelset_phase | ls} | –
{on} | {@ | at | for | in | on | over} | –
Mesh Extent Name | string | –
TouchingMeshExtent | string | –
OpposingMeshExtent | string | –
Data Spec Name | string | –
wetting_saturation_expression_name | “string” | –