Menu

Discussion Forum

New Discussion
Filtra

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

erro：Log of negative

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

Zhou Lu
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

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 27 set 2014, 08:53 GMT-4
COMSOL Moderator

Hello Zhou Lu

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content