CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Divergence detected during single particle deposition analysis

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 18, 2024, 20:55
Exclamation Divergence detected during single particle deposition analysis
  #1
New Member
 
Diego Garcia
Join Date: Nov 2018
Posts: 3
Rep Power: 7
Dynamo is on a distinguished road
Hello everyone,

I have had a particle sedimentation problem for some time that I have not been able to solve.

I want to run a transient simulation of freely falling single particle in 2D as well as in 3D, in a Viscous Stagnant Fluid. To do this, I use overset mesh method and SixDOF solver to solve compute external forces and moments resulting from the interaction of the body with the fluid.

For this, I also have used a UDF in which I defined the properties of the SixDOF Solver ( mass and moments of inertia) and which was also adapted to track the components of the velocity of the CG during the fall.

I have already tested it and it is functional, however when I define very small mass units for the solver (1e-3 kg, 1e-4 kg...) divergence is detected in AMG solver with a floating point exception.

I have tried many options and I have not been able to solve it, I have changed the mesh, with quality monitoring, trying different meshing methods, turbulence models, CFL number, different time step size, using dynamic meshes instead of the Overset mesh method , different solution methods, pressure-velocity coupling, One DOF analysis but nothing has worked.

If anyone has experience on this topic, please suggest me something helpful. I can share the case files and images. I am using Ansys Fluent 19.3, 22R1 or 23R2. Thanks and excuse me for my english!
Dynamo is offline   Reply With Quote

Old   March 10, 2024, 19:54
Default
  #2
New Member
 
Diego Garcia
Join Date: Nov 2018
Posts: 3
Rep Power: 7
Dynamo is on a distinguished road
Does anyone have an idea to solve this problem?
Dynamo is offline   Reply With Quote

Reply

Tags
divergence amg solver, fluent - udf, freely falling, overset mesh, sdof_properties

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Population Balance Modeling (PBM) - Ansys Fluent chittipo FLUENT 164 November 18, 2023 11:54
Divergence detected in AMG solver. VOF. Mr.Mister Fluent Multiphase 4 September 25, 2023 07:10
fluent divergence for no reason sufjanst FLUENT 2 March 23, 2016 16:08
Divergence detected in AMG solver: k, epsilon, pressure coupled Tanjina FLUENT 5 January 13, 2014 10:46
Floating point error and divergence detected aannjj FLUENT 0 July 2, 2013 03:44


All times are GMT -4. The time now is 00:41.