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 The information provided may be out of date.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.
Heat transfer with Reaction ( Unknown function error)
Posted 31 mars 2014, 06:38 UTC−4 Chemical Reaction Engineering Version 4.3b 0 Replies
Please login with a confirmed email address before reporting spam
I am trying to simulate a catalyst pellet for a highly exothermic reaction. I defined all the global parameters and in the physics, I selected coefficient form PDE for energy balance and transport of diluted species for species balance. I have 2 reactants and 41 products (total of 43 species). The effective diffusivities are a function of temperature and I am using mod1.Tp [here Tp is the particle temperature] to calculate the values. The reaction rates are a function of partial pressures and these are calculated by using mod1.conc of the respective species. When I try to run the study I get the following error.
"The following feature has encountered a problem:
unknown function or operator:
name: Ln
feature: stationary solver1(sol1/s1)
error: unknown function or operator"
Any help will be deeply appreciated .
Hello Arvind Nanduri
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.