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Enforcing variables to be greater than or equal to zero
Posted Dec 2, 2012, 6:29 PM EST 3 Replies
I'm modelling diffusion through a porous medium with adsorption. The main dependent variable for mass concentration tends to go below zero which is not true in reality. Is there a way to enforce my variables to be >=0 at all times?
I would also like to apply this condition to other concentrations that I specify in my additional variables.
Any suggestions would be greatly appreciated.