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Negative Concentrations

Posted 28 set 2016, 22:37 GMT-4 2 Replies

Krish
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Hello,

How to avoid negative concentrations? Can anyone please help me?

dCA/dt = -CA1*ko*exp(-E/R/T)

I used the following constraint on concentration.

CA1=if(CA<0,0[mol/m^3],CA)

But it returns the following error
Recoverable error in residual, but solver could not recover.
Time : 0.03270013548094004
Last time step is not converged.

Thanks
Krish


2 Replies Last Post 29 set 2016, 11:22 GMT-4
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 29 set 2016, 10:11 GMT-4
Hello Krish,
This link may help:
www.comsol.com/support/knowledgebase/952/
Best regards,
Jeff
Hello Krish, This link may help: https://www.comsol.com/support/knowledgebase/952/ Best regards, Jeff
Krish
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Posted: 8 years ago 29 set 2016, 11:22 GMT-4
Thank you, Jeff.

Krish
Thank you, Jeff. Krish

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