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negative values of additional variable

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Old   November 15, 2011, 05:42
Default negative values of additional variable
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Dear all,

I am modeling the concentration of a solute in a multi-domain simulation using an additional variable (transport equation).
At both sides of the interface boundary i define no flux boundary condition and source flux and transfer coefficient. In the one domain i have negative transfer coefficient (sink) and at the other positive (source) is that correct?
Hoever, in the results i receive some negative values which are not reliable.
I use refined mesh as well as smaller time steps, but nothing.
Do you have any idea? How can i bound the additional variable?
I will attach later the CCL file.
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