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Re: How to solve the problem of negative concentration

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Hi, I am working with COMSOL 5.2 a. Is there still a same function to set as what you said about "if(c<0,eps,c)" ? Cause when I try with Definitions--> variables, it goes red (means can not recognized) after I put the if function under expression.

Thanks,
Blake


Hi,

Here is one trick to solve negative concentrations.

I made variable "C" which is defined by "if(c<0,eps,c)" under Definitions => Variables. Instead of concentration "c" I used variable "C". Now variable "C" is never below zero. Eps is very small number defined is Comsol.

Does this help you?

Best regard

Tero



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