Mailman 3 March 2010 - SfePy

Stress strain calculations
by freevryheid April 3, 2010

April 3, 2010

Hey guys First off let me congratulate you on an excellent FEM application. The more I get into it, the more I appreciate the volume of work that has gone into it :) I particularly like the way a problem is defined using python. I've never come across anything else that allows such a simple yet powerful definition. I understand that the app is still under development and that the documentation is lacking. My experience with FEM software has mostly been "blackboxed" using ABAQUS, etc. My lack of knowledge on the (weak) formulation of a problem is severely restricting my application of SfePy. For example, I have not been able to figure out how to output stresses and strains in the model using linear elastic analysis - the example provided only outputs displacements. Can someone please point me in the right direction. Regards Andre Smit

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runTests fails on ubuntu karmic x86
by freevryheid April 2, 2010

April 2, 2010

fails 1/60 tests: here's the debug output grassy@work:~/sfepy./runTests.py --debug tests/ test_input_linear_elastic_mM.py <<< directory: tests, test files: 1 <<< tests/test_input_linear_elastic_mM.py sfepy: left over: ['__builtins__', '_filename', '__file__', '__package__', 'TestInput', 'input_name', '__name__', 'output_name', '__doc__'] --- test instance creation failed Traceback (most recent call last): File "./runTests.py", line 225, in <module> main() File "./runTests.py", line 216, in main run_tests(stats, dirname, [filename]) File "./runTests.py", line 148, in run_tests n_fail, n_total, test_time = run_test( conf_name, options ) File "./runTests.py", line 95, in run_test test = conf.funmod.Test.from_conf( conf, options ) File "tests/testsBasic.py", line 21, in from_conf test_conf = ProblemConf.from_file( input_name, required, other ) File "/home/grassy/sfepy/sfepy/base/conf.py", line 239, in from_file funmod = import_file( filename ) File "/home/grassy/sfepy/sfepy/base/base.py", line 86, in import_file mod = __import__(name) File "tests/../examples/homogenization/linear_elastic_mM.py", line 4, in <module> from sfepy.homogenization.micmac import get_homog_coefs_linear File "/home/grassy/sfepy/sfepy/homogenization/micmac.py", line 6, in <module> import tables as pt File "/usr/lib/python2.6/dist-packages/tables/__init__.py", line 76, in <module> from tables.file import File, openFile, copyFile File "/usr/lib/python2.6/dist-packages/tables/file.py", line 44, in <module> from tables import hdf5Extension ImportError: cannot import name hdf5Extension perhaps cython related?

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examples (wiki)
by Robert Cimrman April 1, 2010

April 1, 2010

Hi all, The examples at [1] are very old (*) and not very well formatted. Has anyone something nice and interesting to replace them? The site [1] should contain preferably examples from sfepy users (if such a beast really exists), as the work of the team I am in is presented at [2]. I would like to move the old examples to an OldExamples wiki page for the record. r. (*) 14 test file(s) executed in 13.51 s, 0 failure(s) of 18 test(s) - now it's 59 tests [1] http://code.google.com/p/sfepy/wiki/Examples [2] http://sfepy.kme.zcu.cz/

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system-wide install with 2010.1
by Robert Cimrman March 12, 2010

March 12, 2010

Hi all, the version 2010.1, when installed system-wide, has wrong paths to meshes and other data files. It is still usable, but the tests fail so if you do not want to use sfepy in-place and you want all tests ok, get the latest git snapshot at [1]. r. [1] http://code.google.com/p/sfepy/wiki/Downloads?tm=2

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Some help about postproc.py
by Sylvain Arreckx March 5, 2010

March 5, 2010

Hello, I installed your sfepy software yesterday without any trouble. I'm on ubuntu 9.10 Karmic and I have mayavi2 installed and working properly I followed the installation process. I ran ./runTests.py and got : << directory: tests, test files: 37 37 test file(s) executed in 86.85 s, 0 failure(s) of 50 test(s) So up to now everything is fine. Today, I tried ./simple.py input/poisson.py and then visualized the solution : ./postproc.py simple.vtk and got that : Traceback (most recent call last): File "./postproc.py", line 288, in <module> main() File "./postproc.py", line 281, in main view = view_file(filenames, filter_names, options) File "./postproc.py", line 147, in view_file step=options.step, anti_aliasing=options.anti_aliasing) File "/home/syarra/Programmes/sfepy/sfepy-release-2009.4/sfepy/ postprocess/viewer.py", line 557, in call_mlab scene = gui.scene.mayavi_scene AttributeError: 'MlabSceneModel' object has no attribute 'mayavi_scene' Could you please help me to solve this problem Thanks Sylvain

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ANN: SfePy 2010.1
by Robert Cimrman March 1, 2010

March 1, 2010

I am pleased to announce release 2010.1 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. The code is based on NumPy and SciPy packages. It is distributed under the new BSD license. Mailing lists, issue tracking, git repository: http://sfepy.org Home page: http://sfepy.kme.zcu.cz Documentation: http://docs.sfepy.org/doc Contributors to this release: Vladimír Lukeš, Logan Sorenson. Highlights of this release -------------------------- - new sphinx-based documentation - refactoring of base functions (polynomial spaces) and element geometry description - interpolation between different meshes - terms for describing perfusion and active fibres in the total Lagrangian formulation (applicable, for example, to active muscle tissue models) Major improvements ------------------ Apart from many bug-fixes, let us mention: - data probing: - automatic refinement of probe points, speed-up - postprocessing and visualization: - VTK source construction for any format supported by MeshIO classes: - this means displaying meshes in formats Mayavi knows nothing about - graphical logging: - support logging to a text file, vertical line plot, allow several Log instances - new examples: - application of the theory of homogenization to elasticity - perfusion, active fibres - new tests and many new terms For more information on this release, see http://sfepy.googlecode.com/svn/web/releases/2010.1_RELEASE_NOTES.txt (full release notes, rather long). Best regards, Robert Cimrman

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