Hi Mai,

it is the flux in both cases. If the balance equation is written as
dM(u) / dt + div(F(u)) + r(u) = 0,
the Neumann conditions prescribe
F(u).n
across the boundary.

Kind regards
Bernd

On 10/18/2016 04:00 PM, Trung Hieu Mai wrote:
Dear Dumux,

I have a quick question about the definition of Neumann boundary condition in Dumux. Is it the flux value or the gradient value ? (in both cases: normal Neumann and solution dependent Neumann)

Thank you and best wishes,

Mai

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