A number of models use a surface formulation which follow the Pick & Sonnenburg approach, essentially an additional PDE is used to track the surface coverage and additional reactions for the transport of hydrogen atoms between the surface layer and bulk.
Reason
A number of models use a surface formulation which follow the Pick & Sonnenburg approach, essentially an additional PDE is used to track the surface coverage and additional reactions for the transport of hydrogen atoms between the surface layer and bulk.
Design
Add capability to model this approach
Impact
Enhance capabilities for surface kinetics
Suggested by @stephen-dixon