CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

FSI floating point error on stressModel displacement iteration

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 22, 2016, 10:41
Default FSI floating point error on stressModel displacement iteration
  #1
New Member
 
Kyle Davis
Join Date: Feb 2016
Posts: 1
Rep Power: 0
Kyle.Davis is on a distinguished road
Hi

I am trying to run a simple case with foam-extend 3.1 using the FSI application. I have imported a simple mesh created in Netgen 4.9.13 in OpenFoam format as I will need to import more complicated meshes at a later stage for the solid structure. I used checkMesh and everything is fine. I then used snappyHexMesh to create a fluid mesh around the solid, which checkMesh also showed is fine.

When running fsiFoam, there is not a problem with the fluid-to-solid interpolators or solid-to-fluid. The simulation runs for the first fluid iteration, however I get a floating point error when trying to solve the stress model. The forces on the fluid and solid are calculated and displayed, however no iterations are displayed for actually solving the displacements of the solid.

Total force (fluid) = (-0.00382077 -1.38906 -1.60812)
Total force (solid) = (0.00382077 1.38906 1.60812)
Evolving stress model
-0.0166856, 1.00047
Floating point exception (core dumped)

I believe I could be having a problem with the stressFoam solver trying to use a mesh that was not created with an OpenFoam utility, however further meshes with be too complicated to use blockMesh, hence me trying to import a mesh of a simple case. I am also not sure how to determine where the problem could be in the source code of the solid solver, and any help on explaining how to do so will be appreciated.

I have added a link below to the zip file with the already run case. The log.fsiFoam is included with the error shown. The solid and fluid mesh have already been created and only fsiFoam needs to be run.

https://www.dropbox.com/s/pa6cz7l3uj...lock2.zip?dl=0

Kind Regards
Kyle
Kyle.Davis is offline   Reply With Quote

Old   October 2, 2018, 05:51
Default Same PRoblem
  #2
New Member
 
Evelyn
Join Date: Nov 2017
Posts: 7
Rep Power: 6
BiomechanicsBath is on a distinguished road
Hi


I am in the exact same situation you were. Have you figured out what happened? I have been playing around with the stress Model in StressProperties (convergence tolerance and nCorrectors increased), but that seems a bit like a quick-and-dirty fix. Any better Idea on how to fix this issue?
Thanks in advance!
BiomechanicsBath is offline   Reply With Quote

Old   October 14, 2018, 10:19
Default FSI floating point error
  #3
New Member
 
Shyam Sunder
Join Date: Sep 2015
Posts: 27
Rep Power: 9
ssyadav is on a distinguished road
Hello All


I am trying to run fsiFOAM in parallel, but I am getting segmentation fault error while the solver is solving for solid deformation. The error is shown below:


Evolving solid solver: unsTotalLagrangianSolid
[cfd2:20298] *** Process received signal ***
[cfd2:20298] Signal: Segmentation fault (11)
[cfd2:20298] Signal code: (-6)
[cfd2:20298] Failing at address: 0x3e800004f4a


The serial version is working perfectly fine.


My question to the community is that how to decompose the case?


Currently I am using simple method and " globalFaceZones (SOLIDZone_to_FLUIDZone-zone) " in the solid decomposeParDict file and similarly for the fluid side patch in fluid decomposeParDict file.


Thanks for the help in advance.


Regards


Shyam Sunder
ssyadav is offline   Reply With Quote

Old   January 15, 2019, 16:17
Default
  #4
New Member
 
Evelyn
Join Date: Nov 2017
Posts: 7
Rep Power: 6
BiomechanicsBath is on a distinguished road
Hi Kyle
Have you ever solved your problem. I am at the exact same problem now. If i am using air as the fluid I have no problems, just when using water or any other fluid.
Did you experience the same issue?
BiomechanicsBath is offline   Reply With Quote

Reply

Tags
floating point error, fsi, imported mesh, stressmodel

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
icoFoam - Floating point exception (core dumped) File OpenFOAM Running, Solving & CFD 26 March 6, 2021 04:26
A floating point exception - SEM Model yansheng STAR-CCM+ 1 April 4, 2016 04:57
fluent divergence for no reason sufjanst FLUENT 2 March 23, 2016 16:08
rhoPimpleFoam floating point error dancfd OpenFOAM Running, Solving & CFD 6 January 5, 2014 20:57
a reconstructPar issue immortality OpenFOAM Post-Processing 8 June 16, 2013 11:25


All times are GMT -4. The time now is 05:31.