July 14, 2020 at 12:49 pmjFrohSubscriber
I'm new to Fluent and I'm currently working on a packed bed, multiphase gas-liquid Fischer Trospch reactor in Fluent (species and energy enabled, laminar model). I've created the mesh and set up the simulation (using a UDF to model the reactions as hetergoneous reactions, 15 reactions in total) with all boundary conditions defined.
After initializing the solution, I tried to start the calculation, but Fluent doesn't start the iteration and doesn't give an error message either. I don't know why this is and would be very grateful if someone has an idea what could be the problem.
The mesh I've created has this size:
Level Cells Faces Nodes Partitions
0 135874 316351 48708 1
3 cell zones, 16 face zones.
Thank you for any help!
July 14, 2020 at 2:20 pmRKAnsys Employee
Can you please click on "Check Case" and see if there are any recommendations?
July 14, 2020 at 5:04 pmDrAmineAnsys Employeevery interesting: new to Fluent but using UDF for Fischer Tropsch. What does case check tell? How does the run task page look?
July 14, 2020 at 5:34 pmjFrohSubscriber
Thanks for your replies, I get two messages from phase check:
1) Boundaries and cell zones: Non-zero operating pressure set. This will be added to gauge pressure inputs.
My operating pressure is 101325 Pa.
2) Materials: Assign individual fluid Cps to polynomial functions of temperature.
I defined the cp as constant, which might not be correct but I don't think that this prevents the calculation from starting to run.
Thanks for your time!
And yes, I'm working on a project that requires the use of a UDF to implement the kinetic model I'd like to use. I'm basing this on a paper that corresponds to the topic.
July 14, 2020 at 9:44 pmjFrohSubscriber
Update: I was able to find the mistake, it was in the code of the UDF. Now the iteration starts but detects a floating point exception after a few iterations. If I'm unable to find a solution to that, I'll post here again.
July 15, 2020 at 6:30 amDrAmineAnsys Employee
Perfect! Please then create a new thread for that.
November 25, 2022 at 10:01 amTim WeberSubscriber
Hi, I have the same issue. When I press calculate it just stays at 0% and never proceeds. I does not give me any error message and if I perform check case, all is good it says.
I want to perform a transient calculation. The last message is updating solution at tim levl N...done. then nothing.
At the end I have to forcefully shut-down fluent because it gets stuck without even starting
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Suppress Fluent to open with GUI while performing in journal file
- Heat transfer coefficient
- What are the differences between CFX and Fluent?
- Floating point exception in Fluent
- The solver failed with a non-zero exit code of : 2
- Getting graph and tabular data from result in workbench mechanical
- Difference between K-epsilon and K-omega Turbulence Model
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error in cfd post
© 2022 Copyright ANSYS, Inc. All rights reserved.