Mailman 3 July 2008 - SfePy

new coding style
by Robert Cimrman 21 Jul '08

21 Jul '08

Hi all, In the development version of SfePy, I have just finished a large refactoring aimed at adhering to python style guidelines, see 'http://code.google.com/p/sfepy/wiki/CodingStyle'. The change has been pushed for by Ondrej (thanks for being insistent) and motivated by the fact that most of our favorite Python projects already use this style. You can use './script/edit_identifiers.py <files>' to convert your code to the new style. Some manual tweaks might be needed, though, as the script is a quick one-shot hack. This style will be used in the next release, that is why I inform you in advance about what is going on in the development code. Best wishes, r.

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working directory question
by Ryan Krauss 10 Jul '08

10 Jul '08

I have a question about where you guys put the files you are working on with SfePy. For SciPy and NumPy, I am used to having an svn directory that is only for the scipy/numpy code. Once I do "sudo python setup.py install", I leave that directory and don't do any actual work in it. SfePy doesn't seem to work that way. The thing about that that is tricky for me is that I like to use Unison to sychronize my laptop and desktop. They have different processors, so I don't want to syncronize any build directories (or anything else that would get typically modified by mercurial), but I do want to sync my own stuff (meshes and input files and such). Do you put all your personal work in folders that are underneath the main SfePy directory? Or with enough paths added to PYTHONPATH, can I put my SfePy related stuff in any directory? Thanks, Ryan

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reseting freehg.sympy.org
by Ondrej Certik 10 Jul '08

10 Jul '08

Hi, I need to restart the server and at this occasion, I'll also move the repositories from /tmp. :) Anyway, this time you'll have to recreate them, next time all should be ok. Ondrej

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Paraview repo
by Ryan Krauss 09 Jul '08

09 Jul '08

What repository do I need to add to /etc/apt/sources.list to get paraview easily installed? I don't see it in Synaptic with my current list of sources (I am running Ubuntu 7.10). Thanks, Ryan

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first steps
by Ryan Krauss 09 Jul '08

09 Jul '08

So, I am taking my first steps in using SfePy. I have two questions, one about mesh generation and one about the results I am getting. First, about mesh generation. I am trying to understand the workflow. What is actually necessary? What is the easiest way to create a mesh for a really simple part, like a cube or cylinder? I have tinkered with TetGen and have generated a mesh that way. I was reading through convert.py and trying to understand what it wants as an input. In the end, I didn't use convert.py and simply set fileName_mesh = 'input/first_mesh.1.node' in my input file. Is this correct? Is it best? Does it actually read all the other files about by TetGen (.face and .ele), or is it only using the .node file? First_mesh.poly is my input to TetGen and the others are the output. I think it worked. For my second question, I used the attached mesh files along with the input script from_Robert.py (something he sent me a while back) and simply.py and got the following output: In [1]: run simple.py input/from_Robert.py sfe: warning: other missing: ['functions', 'modules', 'epbc_[0-9]+|epbcs', 'lcbc_[0-9]+|lcbcs', 'nbc_[0-9]+|nbcs', 'options'] sfe: warning: left over: ['tractionLoad'] sfe: reading mesh... nodes: 100% |############################################| Time: 00:00:00 elements: 100% |#########################################| Time: 00:00:00 sfe: ...done in 0.04 s sfe: setting up domain edges... sfe: ...done in 0.00 s sfe: setting up domain faces... sfe: ...done in 0.01 s sfe: creating regions... sfe: leaf Top region_2 sfe: leaf Omega region_1000 sfe: leaf Bottom region_1 sfe: ...done in 0.04 s sfe: equation "balance_of_forces": sfe: dw_lin_elastic_iso.i1.Omega( solid.lame, v, u ) = dw_surface_ltr.isurf.Top( traction.val, v ) sfe: describing geometries... sfe: ...done in 0.01 s sfe: setting up dof connectivities... sfe: ...done in 0.00 s sfe: using solvers: nls: newton ls: ls sfe: matrix shape: (156, 156) sfe: assembling matrix graph... sfe: ...done in 0.00 s sfe: matrix structural nonzeros: 4248 (1.75e-01% fill) sfe: updating materials... sfe: solid sfe: traction TimeStepper nDigit: 1 t0: 0.0 t1: 1.0 step: 0 time: 0.0 dt: 1.0 times: [ 0.] nt: 0.0 nStep: 1 input/from_Robert.py, 69: tractionLoad(), 76 sfe: ...done in 0.00 s sfe: nls: iter: 0, residual: 0.000000e+00 (rel: 0.000000e+00) and the attached vtk file. The vtk file seems to say that the force at each node is 0. That doesn't seem right. Am I doing something wrong? Are these results actually valid? How should I proceed? I was thinking that in terms of material modeling, I would start with a static compressive load applied to the foam specimen, then a load that ramps up and watch the displacement and stress in each case. Start with small stresses and strains and then talk about how to handle large strains. Does that make sense? Thanks for your help. Ryan

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numpy_prefix
by Robert Cimrman 08 Jul '08

08 Jul '08

FYI: I have changed the default to ''. r.

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update of equations: linear combination of terms
by Robert Cimrman 08 Jul '08

08 Jul '08

Just to inform you that equation syntax was generalized for an arbitrary linear combination of terms, e.g.: 2 * dw_laplace.i1.Omega( coef.val, s, t ) = - 0.5 * dw_volume_lvf.i1.Omega( rhs.val, s ) It is no more necessary to pass a multiplicative constant via a material argument. r.

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Scipy08 conferences
by Robert Cimrman 07 Jul '08

07 Jul '08

Hi, thanks to Ondrej and Ryan, there will be two more (Ryan) or less (Ondrej) SfePy-related talks at the SciPy 2008 conference at Caltech, http://conference.scipy.org/. Submit, please, issues related to your topics at http://code.google.com/p/sfepy/issues/list, so that all can see what needs to be done prior to the conference. r.

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ANN: SfePy 00.46.02
by Robert Cimrman 01 Jul '08

01 Jul '08

I am pleased announce the release of SfePy 00.46.02. SfePy is a finite element analysis software in Python, based primarily on Numpy and SciPy. Mailing lists, issue tracking, mercurial repository: http://sfepy.org Home page: http://sfepy.kme.zcu.cz Major improvements: - alternative short syntax for specifying essential boundary conditions, variables and regions - manufactured solutions tests: - SymPy support - site configuration now via script/config.py + site_cfg.py - new solvers - new terms For more information on this release, see http://sfepy.googlecode.com/svn/web/releases/004602_RELEASE_NOTES.txt If you happen to come to Leipzig for EuroSciPy 2008, see you there! Best regards, Robert Cimrman & SfePy developers

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SfePy July 2008