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erro：Log of negative

Posted 2014年9月27日 GMT-4 08:53 Fluid & Heat, Heat Transfer & Phase Change, Chemical Reaction Engineering Version 4.4 0 Replies

Zhou Lu
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Hi,

I am getting the following error:
Log of negative
Function: log
Failed to evaluate variable
Variable: mod1.St, Defined as: ((mod1.p>=mod1.pea)*((cs-mod1.c)*(log((mod1.p/mod1.pea))*(exp(((-Ea)/(Rg*mod1.T)))*ka))))
Failed to evaluate expression
Expression: d((2*mod1.St*test(mod1.c)*pi*r)*(dvol),{test0})

Do you know how to fix this problem?

Thanks in advance for the comments
0 Replies Last Post 2014年9月27日 GMT-4 08:53
COMSOL Moderator

Hello Zhou Lu

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