SfePy February 2016

sfepy@python.org

4 participants
9 discussions

Material Parameters of Individual Nodes
by derj...＠web.de 11 Apr '22

11 Apr '22

Hello! It's a great tool you built there! I'd like to use it for some kind of topology optimisation. Is there an "idiomatic" way to set the material parameters of individual nodes? Thank you very much! JonnyB

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Re: Torque
by Robert Cimrman 09 Mar '18

09 Mar '18

In examples/large_deformation/hyperelastic.py a rotation by displacements is applied. By using a similar function the vectors defining the force couples could be defined for dw_surface_ltr (IMHO). Does it make sense? r. ----- Reply message ----- From: "Andre Smit" <freev...(a)gmail.com> To: <sfepy...(a)googlegroups.com> Subject: Torque Date: Sat, Dec 18, 2010 05:10 What is the best way to apply a torque load to a model? -- Andre -- You received this message because you are subscribed to the Google Groups "sfepy-devel" group. To post to this group, send email to sfepy...(a)googlegroups.com. To unsubscribe from this group, send email to sfepy-devel...(a)googlegroups.com. For more options, visit this group at http://groups.google.com/group/sfepy-devel?hl=en.

4 7

new interactive example with time stepping
by Robert Cimrman 13 Mar '17

13 Mar '17

Hi, I have just updated the time stepping solvers in sfepy for interactive use, as demonstrated in the new example [1]. For basic use, ignore the probing code - the time stepper can be used as simply as: tss = SimpleTimeSteppingSolver({'t0' : 0.0, 't1' : 100.0, 'n_step' : 11}, problem=problem) tss.init_time() for step, time, state in tss(): pass r. [1] http://sfepy.org/doc-devel/examples/diffusion/time_poisson_interactive.html

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postprocessing
by Nina Halabi 05 May '16

05 May '16

Dear Robert I could overcome my previous problems of not having root privileges, so it all worked up till the command: ./postproc.py cylinder.vtk This echoed the below message: Exception In /home/gmh/.local/lib/python2.7/site-packages/mayavi-4.4.4.dev0-py2.7-linux-x86_64.egg/mayavi/sources/vtk_xml_file_reader.py:86 AttributeError: 'AlgorithmOutput' object has no attribute 'point_data' (in get_all_attributes) Traceback (most recent call last): File "/home/gmh/.local/lib/python2.7/site-packages/traits-4.6.0.dev354-py2.7-linux-x86_64.egg/traits/trait_notifiers.py", line 340, in __call__ self.handler( *args ) File "/home/gmh/sfepy/sfepy/postprocess/dataset_manager.py", line 177, in _dataset_changed self._assign_attribute.input = value File "/home/gmh/.local/lib/python2.7/site-packages/traits-4.6.0.dev354-py2.7-linux-x86_64.egg/traits/trait_handlers.py", line 104, in _read_only name, class_of( object ) ) TraitError: The 'input' trait of an AssignAttribute instance is 'read only'. sfepy: point scalars t at [-0.05 -0.02 0. ] sfepy: range: -2.00e+00 2.00e+00 l2 norm range: 1.06e-02 2.00e+00 No handlers could be found for logger "mayavi.core.common" I'm using Python 2.7.8 if that's relevant to the current issue. Thanks again Cheers

4 5

mesh_generators.gen_mesh_from_goem
by Adolfo Rodriguez 30 Mar '16

30 Mar '16

I am trying to generate a mesh from geometry but it does not seem to be working. Does anybody have experience with this option? I am attaching a sample code.

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ANN: SfePy 2016.1
by Robert Cimrman 24 Feb '16

24 Feb '16

I am pleased to announce release 2016.1 of SfePy. Description ----------- SfePy (simple finite elements in Python) is a software for solving systems of coupled partial differential equations by the finite element method or by the isogeometric analysis (preliminary support). It is distributed under the new BSD license. Home page: http://sfepy.org Mailing list: http://groups.google.com/group/sfepy-devel Git (source) repository, issue tracker, wiki: http://github.com/sfepy Highlights of this release -------------------------- - major simplification of finite element field code - automatic checking of shapes of term arguments - improved mesh parametrization code and documentation - support for fieldsplit preconditioners of PETSc For full release notes see http://docs.sfepy.org/doc/release_notes.html#id1 (rather long and technical). Best regards, Robert Cimrman on behalf of the SfePy development team --- Contributors to this release in alphabetical order: Robert Cimrman Vladimir Lukes

1 0

d_surface_flux troubles
by Bjarke Dalslet 22 Feb '16

22 Feb '16

Hi sfepy users! I have a bit of trouble with evaluating surface fluxes when using the poisson equation. I have a spherical shell geometry, where the inner shell surface and the outer shell surface are kept at two different potentials. There is spherical symmetry, so the flux should be equally distributed on the surface faces of each shell. Also, the total flux for the two surfaces should be the same, except for an opposite sign. After solving the PDE the main variable field, t, looks fine, there is a 1/r dependence as expected. But when I evaluate the surface fluxes on either the inner or the outer shell there are both positive and negative fluxes per face. For each sphere there are two positive flux regions and two negative flux regions. I checked my surface normals and they look as expected, i.e. parallel to a vector from the origo to the face on the outer surface, and antiparallel on the inner surface. I use the call Surfaces_flux=pb.evaluate('d_surface_flux.i.Surfaces(coef.val,t)', mode='el_eval',verbose=False) to evaluate the flux. I hope that there is someone who can point out the obvious and easy-to-fix mistake i made... Best regards - Bjarke Dalslet

2 4

explicit time stepping
by Robert Cimrman 17 Feb '16

17 Feb '16

FYI: I have realized that sfepy can do the explicit time-stepping (forward Euler method) as in [1] just by replacing # Backward Euler method for temperature evolution. equations = { 'Temperature' : """dw_volume_dot.i.Omega( s, dT/dt ) + dw_laplace.i.Omega( coef.val, s, T ) = 0""" } by # Forward Euler method for temperature evolution. equations = { 'Temperature' : """dw_volume_dot.i.Omega( s, dT/dt ) + dw_laplace.i.Omega( coef.val, s, T[-1] ) = 0""" } That is why the (broken) 'ts.explicit' solver was removed - 'ts.simple' or 'ts.adaptive' can be used instead. r. [1] http://sfepy.org/doc-devel/examples/diffusion/time_poisson_explicit.html

1 0

new logo?
by Robert Cimrman 09 Feb '16

09 Feb '16

FYI: Better late then never, I have created a new issue [1] to discuss a possible new logo. Kudos to Serge-Étienne Parent for the two proposals from December 2015! r. [1] https://github.com/sfepy/sfepy/issues/303

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SfePy February 2016