SfePy August 2014

sfepy@python.org

5 participants
12 discussions

by Robert Cimrman

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.

2 years, 5 months

1D line elements in SfePy

by Nimish

I am currrently looking for FEM packages to help me solve a system of beams and columns, basically a collection of 1D bernoulli/timoshenko line elements. I started reading SfePy docs and i am getting the idea that doing the above is not really possible here, am i right? Are only 2D area elements permitted in SfePy? Or is there any direct support for solving 1D line elements too.. Cheers Nimish

4 years, 6 months

SfePy system-wide installation

by G.L.

Hi ! First of all, congratulation for this great piece of software ! I was trying to build and install SfePy system-wide (2014.1 or 2014.2), but ran into troubles. I followed the instructions on the website ("python setup.py build", then "python setup.py install"). There was no special error during the build (some warnings from gcc) or the installation. However, when I try to run the tests, nothing is working : > 79 test file(s) executed in 0.55 s, 92 failure(s) of 103 test(s) The errors are due to python that fails to import SfePy modules : ./run_tests.py --debug tests/test_cmesh.py > .... > .... > .... > File "tests/test_cmesh.py", line 96, in test_cmesh_counts > from sfepy.discrete.fem import Mesh > File "/scratch/packages/sfepy-2014.2/sfepy/discrete/__init__.py", line > 8, in <module> > from variables import Variables, Variable, FieldVariable, > create_adof_conns > File "/scratch/packages/sfepy-2014.2/sfepy/discrete/variables.py", line > 12, in <module> > import sfepy.linalg as la > File "/scratch/packages/sfepy-2014.2/sfepy/linalg/__init__.py", line 1, > in <module> > from extmods.crcm import rcm, permute_in_place > ImportError: No module named crcm I don't understant, because everything is installed in my /usr/local/lib/python2.7/ (I run an ubuntu 14.04) If I do an inplace build, everything works fine (but I really want to install SfePy system-wide...) I really don't know how to fix that... any idea ? Thank you very much ! G.

5 years, 9 months

Re: [sfepy-devel] How does SfePy determine which arguments to pass to functions.

by Robert Cimrman

See [1] - the arguments depend on the kind of function. [1] http://sfepy.org/doc-devel/users_guide.html#functions ----- Reply message ----- From: "Matthew Dornfeld" <mdor...(a)gmail.com> To: <sfepy...(a)googlegroups.com> Subject: [sfepy-devel] How does SfePy determine which arguments to pass to functions. Date: Mon, Aug 25, 2014 19:30 I'm looking at this example here htt p://sfepy.org/doc-devel/examples/diffusion/poisson_functions.html. I see how all the functions are defined out in Python space. Then they're passed to SfePy by storing them in the functions dict, but there doesn't seem to be any specific mention of which arguments are passed to these functions by SfePy. How exactly does this work? Are the same variables passed to each function? -- You received this message because you are subscribed to the Google Groups "sfepy-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sfepy-devel...(a)googlegroups.com. To post to this group, send email to sfepy...(a)googlegroups.com. Visit this group at http://groups.google.com/group/sfepy-devel.

5 years, 11 months

How does SfePy determine which arguments to pass to functions.

by Matthew Dornfeld

I'm looking at this example here htt p://sfepy.org/doc-devel/examples/diffusion/poisson_functions.html. I see how all the functions are defined out in Python space. Then they're passed to SfePy by storing them in the functions dict, but there doesn't seem to be any specific mention of which arguments are passed to these functions by SfePy. How exactly does this work? Are the same variables passed to each function?

5 years, 11 months

What are the boundary conditions at the outflow in this Navier-Stokes example?

by Matthew Dornfeld

I'm running and modifying this example http://sfepy.org/doc-devel/examples/navier_stokes/navier_stokes.html. I can't see any specific mention of boundary conditions at the outflow. It it using Neumann boundary conditions with sigma_nn=sigma_nt = 0?

5 years, 11 months

Software for viewing 3d meshes

by Matthew Dornfeld

Anyone know good software for viewing 3d .mesh files? I tried python mesh viewer, but it only seems to work for 2d examples.

5 years, 11 months

Convective boundary condition

by Geoff Wright

Hi, I'm trying to use sfepy to model the temperature distribution at steady state, where theres a heat source, conduction through a solid, and convection across a solid/liquid interface. Struggling with the convection part... I've been doing some reading and I think I need to enforce a convective boundary condition, sometimes known as a robin boundary condition. This would add a term where you integrate the temperature of the liquid across the interface surface. Does this sound right? Are there any examples of doing something like this? Thanks, Geoff

5 years, 11 months

How to compute energy density from electric field

by Geoff Wright

Hi Robert, Me again :) but I think this one is easy... in the previous thread about flux I was computing electric field from voltage in the post processing step. I would like to compute energy density also, from electric field. I believe its something like this, in the post_process hook: # compute the electric field electric_field = pb.evaluate('ev_grad.i1.Omega( v )', mode='el_avg') electric_field *= -1.0 out['electric_field'] = Struct(name='Electric field', mode='cell', data=electric_field, dofs=None) # compute the energy density energy_density = pb.evaluate('dw_volume_dot.i1.Omega(p.sigma, ef, ef)', ef=electric_field) out['energy_density'] = Struct(name='Energy density', mode='cell', data=energy_density, dofs=None) However, I get an error when its parsing the variables. How do I specify ef variable properly? I attached the relevant files in case its necessary. Thank you, Geoff

5 years, 11 months

Python 3 compatibility

by Robert Cimrman

FYI: As SciPy 0.12.0 is out and one of the release highlights is "Support for Python 2 and Python 3 from the same code base (no more 2to3)", we can think seriously about updating SfePy in this respect as well, cf. [1]. r. [1] https://github.com/sfepy/sfepy/issues/164

5 years, 12 months

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SfePy August 2014