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A new Flyspray task has been opened.  Details are below. 

User who did this - Markus Wolff (m_wolff) 

Attached to Project - DuMuX
Summary - Implement Dirichlet boundary conditions alternatively as 
solution-dependent neumann conditions
Task Type - Feature Request
Category - Box models
Status - New
Assigned To - 
Operating System - Unspecified
Severity - Low
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - In the decoupled finite volume models Dirichlet boundary conditions 
are implemented as kind of solution dependent flux boundary conditions. The 
fluxes result from the gradient of a given boundary pressure and the current 
pressure in a boundary cell.
In my opinion there are two reasons to implement such a boundary implementation 
as an alternative to the current Dirichlet implementation for the fully 
implicit models:
1) In case of heterogeneous porous media implicit and decoupled models can be 
compared (better/at all?)
2) It leads to a better solution behavior with regard to physics as well as 
with regard to stability at heterogeneous Dirichlet boundaries

More information can be found at the following URL:
http://www.dumux.org/flyspray/index.php?do=details&task_id=165

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