Hi Giang, > Does anyone know which version of deal.II that this example run perfectly?
To answer your immediate question: It looks like the last major change to the code happened in Apr/May 2018 which, in conjunction with the version of deal.II that it previously used to target in the CMakeLists.txt file, means that it was most likely written for deal.II version 9.0. > I would like to report that the time dependent Navier Stokes example in > > https://dealii.org/developer/doxygen/deal.II/code_gallery_time_dependent_navier_stokes.html > > <https://dealii.org/developer/doxygen/deal.II/code_gallery_time_dependent_navier_stokes.html> > > compile but does not run correctly with deal.II 9.2.0 That’s frustrating. Thanks for reporting this; I’ve opened up an issue for this problem (see https://github.com/dealii/code-gallery/issues/88 <https://github.com/dealii/code-gallery/issues/88> ). If you do test it against an older version and find that it works, perhaps you could let us know and we could then try to investigate further. It might be possible to bisect the problem if we know what a good version of the library is (it could also be due to some subtle change related to the parallel partitioning, the PETSc interface, etc. which might have been a bug before and has since been fixed, but breaks this code. Hard to say exactly.). The next release of deal.II is imminent, so it would also be interesting to see if whatever is causing the issue has been fixed between 9.2 and 9.3. Thanks again! Jean-Paul > On 2. Jun 2021, at 19:12, [email protected] <[email protected]> wrote: > > Does anyone know which version of deal.II that this example run perfectly? > > Best > Giang > > On Wednesday, June 2, 2021 at 11:07:34 AM UTC+2 [email protected] > <http://gmail.com/> wrote: > Hello > > I would like to report that the time dependent Navier Stokes example in > > https://dealii.org/developer/doxygen/deal.II/code_gallery_time_dependent_navier_stokes.html > > <https://dealii.org/developer/doxygen/deal.II/code_gallery_time_dependent_navier_stokes.html> > > compile but does not run correctly with deal.II 9.2.0 . The analysis can run > until step 204 and then diverge. Would it be possible changes in > preconditioner destroy the convergence? > > ************************************************************************************************ > Time step = 201, at t = 2.010000e-01 > GMRES_ITR = 8 GMRES_RES = 4.052763e-10 > ************************************************************************************************ > Time step = 202, at t = 2.020000e-01 > GMRES_ITR = 8 GMRES_RES = 7.194398e-10 > ************************************************************************************************ > Time step = 203, at t = 2.030000e-01 > GMRES_ITR = 8 GMRES_RES = 1.361073e-09 > ************************************************************************************************ > Time step = 204, at t = 2.040000e-01 > GMRES_ITR = 8 GMRES_RES = 4.896128e-09 > ************************************************************************************************ > Time step = 205, at t = 2.050000e-01 > GMRES_ITR = 8 GMRES_RES = 3.220123e-08 > ************************************************************************************************ > Time step = 206, at t = 2.060000e-01 > GMRES_ITR = 8 GMRES_RES = 7.647033e-07 > ************************************************************************************************ > Time step = 207, at t = 2.070000e-01 > GMRES_ITR = 8 GMRES_RES = 3.355695e-04 > ************************************************************************************************ > Time step = 208, at t = 2.080000e-01 > GMRES_ITR = 8 GMRES_RES = 5.007715e+01 > ************************************************************************************************ > Time step = 209, at t = 2.090000e-01 > GMRES_ITR = 8 GMRES_RES = 1.262003e+12 > ************************************************************************************************ > Time step = 210, at t = 2.100000e-01 > GMRES_ITR = 8 GMRES_RES = 1.279221e+33 > > Best > Giang > > > -- > The deal.II project is located at http://www.dealii.org/ > <http://www.dealii.org/> > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > <https://groups.google.com/d/forum/dealii?hl=en> > --- > You received this message because you are subscribed to the Google Groups > "deal.II User Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/dealii/4263fa68-e89f-4748-90cf-4d84980102c6n%40googlegroups.com > > <https://groups.google.com/d/msgid/dealii/4263fa68-e89f-4748-90cf-4d84980102c6n%40googlegroups.com?utm_medium=email&utm_source=footer>. -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. 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