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[FSI] icoFsiElasticNonLinULSolidFoam. eigenvalues problem |
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March 21, 2015, 10:08 |
icoFsiElasticNonLinULSolidFoam. eigenvalues problem
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#1 |
Senior Member
Join Date: Jan 2015
Posts: 150
Rep Power: 11 |
I'm trying to simulate FSI on simple elastic pipe. I've create both meshes for fluid and solid. checkMesh found no erros. But when I started icoFsiElasticNonLinULSolidFoam I've got a lot of warning about "complex eigenvalues detected for tensor". And after this the program crashes.
The output: Code:
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | foam-extend: Open Source CFD | | \\ / O peration | Version: 3.1 | | \\ / A nd | Web: http://www.extend-project.de | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 3.1-7d8e040bf53d Exec : /opt/foam/foam-extend-3.1/applications/bin/linux64GccDPOpt/icoFsiElasticNonLinULSolidFoam Date : Mar 21 2015 Time : 15:00:44 Host : sergey-Notebook-PC PID : 12838 CtrlDict : /opt/foam/foam-extend-3.1/etc/controlDict Case : /home/sergey/tmp/elastic_pipe/fluid nProcs : 1 SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create dynamic mesh for time = 0 Selecting dynamicFvMesh dynamicMotionSolverFvMesh Selecting motion solver: laplace Selecting motion diffusivity: quadratic Reading transportProperties Reading field p Reading field U Reading/calculating face flux field phi Reading incremental displacement field DU Patch vessel Traction boundary field: DU nonLinear set to updated Lagrangian Reading incremental displacement field DV Reading accumulated velocity field V Reading accumulated stress field sigma Reading incremental stress field DSigma Selecting rheology model linearElastic Creating constitutive model Reading coupling properties Create fluid-to-solid and solid-to-fluid interpolators Check fluid-to-solid and solid-to-fluid interpolators Fluid-to-solid face interpolation error: 0.20018 Solid-to-fluid face interpolation error: 1.11023e-16 Starting time loop Time = 0.001 Selecting coupling scheme Aitken Time = 0.001, iteration: 1 Current fsi under-relaxation factor: 0.01 Maximal accumulated displacement of interface points: 0 Courant Number mean: 0 max: 0.765854 velocity magnitude: 0.8 DILUPBiCG: Solving for Ux, Initial residual = 0.661236, Final residual = 9.87969e-12, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.657091, Final residual = 9.85265e-12, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 1.05188e-11, No Iterations 2 GAMG: Solving for p, Initial residual = 1, Final residual = 4.06804e-07, No Iterations 16 GAMG: Solving for p, Initial residual = 0.00154278, Final residual = 4.60129e-07, No Iterations 4 time step continuity errors : sum local = 3.54272e-07, global = 1.16647e-07, cumulative = 1.16647e-07 GAMG: Solving for p, Initial residual = 0.000170456, Final residual = 7.44231e-07, No Iterations 5 GAMG: Solving for p, Initial residual = 1.77539e-05, Final residual = 9.98566e-07, No Iterations 1 time step continuity errors : sum local = 7.65403e-07, global = 1.52512e-07, cumulative = 2.69159e-07 Setting traction on solid patch Total traction force = (-4.63054e-08 -2.6171e-07 0.159168) --> FOAM Warning : From function eigenValues(const tensor&) in file primitives/Tensor/tensor/tensor.C at line 170 complex eigenvalues detected for tensor: (-1.15174 0.689561 0.0389201 -0.64029 0.373721 0.0277594 -64.1658 28.6624 -0.601871) --> FOAM Warning : From function eigenValues(const tensor&) in file primitives/Tensor/tensor/tensor.C at line 170 complex eigenvalues detected for tensor: (-1.15174 0.689561 0.0389201 -0.64029 0.373721 0.0277594 -64.1658 28.6624 -0.601871) --> FOAM Warning : From function eigenValues(const tensor&) in file primitives/Tensor/tensor/tensor.C at line 170 complex eigenvalues detected for tensor: (-2.7914 1.59273 0.0193284 -2.34685 2.0507 -0.000694244 -81.644 36.6711 1.82105) |
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March 26, 2015, 07:30 |
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#2 |
New Member
Damon Lee
Join Date: Sep 2014
Posts: 16
Rep Power: 12 |
Could you post your solid/constant/rheologyProperties and solid/system files? Maybe its
Code:
planeStress no; |
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March 26, 2015, 11:46 |
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#3 |
Senior Member
Join Date: Jan 2015
Posts: 150
Rep Power: 11 |
Yes, planeStress was no, but when I changes it to "yes" it doesn't help me...
I attach the case files for fluid and solid, maybe it will be useful.. The file size is bigger than 100k, so I upload it to cloud storage: https://yadi.sk/d/wsPFmLZifYBbr |
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May 18, 2015, 09:18 |
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#4 |
Member
Stephanie
Join Date: Feb 2015
Location: Magdeburg, Germany
Posts: 71
Rep Power: 11 |
Hey,
did one of you find a solution? I run the case with one processor and now I have got the same mistake. I would be verx grateful for anyones help . best regards, Stephie |
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May 21, 2015, 14:09 |
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#5 |
Senior Member
Join Date: Jan 2015
Posts: 150
Rep Power: 11 |
Yes, I solved this problem. In my case the problem was in incorrect mesh definition, which leads to wrong solid-mesh interpolation like:
"Reading coupling properties Create fluid-to-solid and solid-to-fluid interpolators Check fluid-to-solid and solid-to-fluid interpolators Fluid-to-solid face interpolation error: 0.20018 Solid-to-fluid face interpolation error: 1.11023e-16Do you also have THIS problem ? |
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May 22, 2015, 04:41 |
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#6 |
Member
Stephanie
Join Date: Feb 2015
Location: Magdeburg, Germany
Posts: 71
Rep Power: 11 |
Hey,
yes I had a look into my log file and there I found the same mistake: Reading coupling properties Create fluid-to-solid and solid-to-fluid interpolators Check fluid-to-solid and solid-to-fluid interpolators Fluid-to-solid face interpolation error: 1.24127e-16 Solid-to-fluid face interpolation error: 1.24127e-16 How did you solved this problem? |
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May 22, 2015, 04:49 |
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#7 |
Senior Member
Join Date: Jan 2015
Posts: 150
Rep Power: 11 |
It's not an error. In my case the patches were not correctly defined so the interpolation error Fluid-to-solid face interpolation was very big (0.20018). I simply redefine the patches, so the solid and fluid patches become closer to each other. This fix my problem. But you don't have to solve it, because in your case all is OK with interpolation.
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May 22, 2015, 07:56 |
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#8 |
Member
Stephanie
Join Date: Feb 2015
Location: Magdeburg, Germany
Posts: 71
Rep Power: 11 |
Okay, good news.
Unfortunately, every time I restart the case the interpolation error becommes bigger and bigger. Reading coupling properties Reading accumulated fluid interface displacement Create fluid-to-solid and solid-to-fluid interpolators Check fluid-to-solid and solid-to-fluid interpolators Fluid-to-solid face interpolation error: 0.167309 Solid-to-fluid face interpolation error: 0.312902 This was an extract of the log file after I restarted the case. |
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May 22, 2015, 10:28 |
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#9 |
Senior Member
Join Date: Jan 2015
Posts: 150
Rep Power: 11 |
Very interesting... I can't restart the computation from latestTime. I always have to start my computation from zero time...
How do you find the way to continue simulation from last step ? |
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May 22, 2015, 12:19 |
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#10 |
Member
Stephanie
Join Date: Feb 2015
Location: Magdeburg, Germany
Posts: 71
Rep Power: 11 |
If i want to restart the case i change into Fluid and type in icoFsiElasticNonLinULFoam >> log.icoFsiElasticNonLinULFoam
It continues to write the residuals in the log file But be careful it overrides the last log File. So you have to modify the name of the log File. If you run the case in parallel you have to use mpirun. And you have to use startfrom latesttime. I hope i could help you. |
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June 22, 2015, 12:34 |
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#11 | |
Member
Join Date: Dec 2014
Posts: 50
Rep Power: 12 |
Quote:
Fluid-to-solid face interpolation error: -1e+300 Solid-to-fluid face interpolation error: 0.010357179 I created my mesh with ICEM and the patches actually should be fine because with the exact same geometry my simulation works pretty well with very small interpolation errors. What can I do to solve this error? |
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April 2, 2016, 12:34 |
interface separation
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#12 |
New Member
Join Date: Feb 2014
Posts: 9
Rep Power: 12 |
Dear all
has anyone faced the problem of interface separation? , in which the solid interface moves away from fluid interface (as in the attached snapshot) ... it happens very slowly without any crash of solution and at some time step the gap becomes very big and the solver gives "Floating point exception (core dumped) " or "complex eingenvalues in the matrix ... " !! has anyone of you the solution of that? it happens in both fsiFoam and icoFsiElasticNonLinULSolidfoam. by the way i have used the HronTurek tutorial but i just changed the material and thickness of the plate. Furthermore, the fluid domain is perfectly solved as only CFD. |
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September 21, 2016, 11:29 |
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#13 | |
New Member
Georg Göbel
Join Date: Sep 2016
Location: Karlsruhe
Posts: 8
Rep Power: 10 |
Quote:
i experience the same problem on my cases. I am running a 2D-kind of beamInCrossflow case with a solid density of 4000. First i was using fluid density around 1 and it worked perfectly on a a broad selection of meshes. Then i increased to 4000 an the interfaces seperate. I increased the outer iterations of the interaction and of the deformation solver. Both didn't show any remarkable positive effect. Did you find any solution for the problem? |
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December 7, 2018, 20:48 |
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#14 | |
New Member
Ali
Join Date: Jun 2018
Posts: 5
Rep Power: 8 |
Quote:
I know it's been a while since you posted this but did you figure out how to resolve the problem of separation of fluid/solid interface? I have the exact same problem with beamincrossflow! |
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December 10, 2018, 03:12 |
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#15 |
New Member
Georg Göbel
Join Date: Sep 2016
Location: Karlsruhe
Posts: 8
Rep Power: 10 |
Dear Aliiiii,
first of all, i would recommend a switch to a newer version. The FSI package for extent4.1 (you can get it from the extent bazar) is so much better then the older versions. In my eyes, there is actually no reason for mesh-seperation any more, because of the use of the ALE-method. There is even a newer package (solids4foam) in the pipelines that is available on demand, but i think that it will be released in the near future. Good luck Horst |
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January 6, 2019, 22:48 |
how you can finish it.
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#16 | |
Member
...
Join Date: Jan 2019
Posts: 31
Rep Power: 7 |
Quote:
i also run the provided case,but i can't get the result which it can Swing up and down,instead,it stay still;i didn't change any parameter,could you tell me how die you operate? 3Q |
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January 6, 2019, 22:51 |
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#17 |
Member
...
Join Date: Jan 2019
Posts: 31
Rep Power: 7 |
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Tags |
fluid structure interface, foam-extend, fsi simulationns and mesh, openfoam-extend |
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