November 29, 2022 at 4:26 pmChris_gSubscriber
I have recently upgraded from ansys 21 R2 to 22 R2. Since the upgrade all of my DEM cases diverge, usually within the first few time steps. On fluent 21 the same cases are running fine. This happens both on my local machine (Windows 10) and our HPC (Linux).
I usually simulate reactive fluidized beds with high solid loading, however on 22.2 even for low solid loadings with inert particles and deactivation of species and energy equation the simulation still diverges.
Is there a known issue on the version 22.2 that causes problems with DEM simulations?
Thanks for your help!
November 30, 2022 at 11:14 amRobAnsys Employee
I tend not to use DEM in Fluent, and instead use Ansys Rocky as it's significantly more computationally efficient and stable. For a fluidised bed in Fluent I'd use Eulerian over DEM. Are you running hi-res tracking on the DPM model?
November 30, 2022 at 3:53 pmChris_gSubscriber
Thank you for your quick reply.
I will check with our IT department if Ansys Rocky is available for me. If so this might be a better solution.
We are using DEM to get a more detailed picture of the bed and would prefer to stick with it, if it is possible to get it to run.
Currently I am not using hi-res tracking. I did some tests with it and found that convergence is even worse with hi-res turned on.
November 30, 2022 at 4:08 pmRobAnsys Employee
I know we've been working on the DPM model numerics so there may have been a change that's not working well with the DEM part. There's nothing in the release notes, but check through for 22R1 and 22R2 in case you've got a model switched on that I've missed.
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
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
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Difference between K-epsilon and K-omega Turbulence Model
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error in cfd post
© 2023 Copyright ANSYS, Inc. All rights reserved.