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.
Error in temperature calculation in a laminar reacting flow
Posted 18 mai 2021, 20:53 UTC−4 Computational Fluid Dynamics (CFD), Heat Transfer, Chemical Reaction Engineering Version 5.6 0 Replies
Please login with a confirmed email address before reporting spam
I am simulating a simple one-step reacting flow in a 2D domain. I started with a 0D Reacting Engineering physics, and led it to a 2D problem by the function "Generate Space-Dependent Model".
The simulation ran well when I only added "Transport of Concentrated Species" model and "Laminar Flow" model. However, when I added "Heat Transfer in Fluids" model (still via "Generate Space-Dependent Model" function), set the parameters and ran it again, the error message appreared as below:
Error evaluating thermodynamics function.
- Error message: Temperature must be positive real value
- Function: chem1pp1rho_mixture
After this one are a list of "Failed to evaluate variable" errors, which I think are because of the above-mentioned error.
The domain is simply rectangular with a small inlet, an outlet, a symmetric boundary and walls. The reference temperature is kept unchanged as 293.15K. I tested the upstream and initial temperature values from 300K to 1400K while there were always errors. I also tested the case with no heat source (by setting heat source with a zero heat rate instead of "Heat source of reaction"), but the errors still existed.
I am grateful for any idea or discussion to help locate the problem. Hope to hear from you.
Hello Shiyao Ni
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.