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add variable to Predefiend equation

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Dears
I am simulating sucrose bed subjected to high humidity air and the problem is in my simulation the Porosity as a variable should be considered. But In equation in transport of Diluted species in Convection and diffusion term we dont have any porosity. I could not do any thing since porosity should be multiply to concentration and I dont know how should I add an equation to be part of predefined equation.

0 Replies Last Post 21 août 2015, 04:25 UTC−4
COMSOL Moderator

Hello Mohammadreza Jafari

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