iMechanica - What is the status of open source finite element code? - Comments

Modularity is part of the FEAP design

Sanjay Govindjee — Tue, 23 Sep 2008 04:13:04 -0400

Modularity is part of the FEAP design; if you stick to modifying things through the many user interfaces for materials, elements, mesh commands, solution commands, plotting commands, etc. then you are pretty safe with respect to updates. If you muck around in the internal guts of the code then you need to be more careful. That said, if you do something invasive but it is useful to not just you, but also others, then Prof. Taylor will quite often include your developed features (maybe re-writing them) in the next release of the code.

Prof. Dr. Sanjay Govindjee
University of California, Berkeley

Say you have modified FEAP,

Achilleus — Mon, 22 Sep 2008 15:38:56 -0400

Say you have modified FEAP, and then next release of FEAP just comes
out. What do you do? Is FEAP modular enough so that you can insert
your modifications right in, from one release to another? As a user,
can you contribute to FEAP? How do you do that?

Thanks

Cris

Hey

oyunindir90 — Sun, 24 Aug 2008 16:46:32 -0400

one of the disadvantages of ELMER is it does not use PETSC and it's ability in solver paralization is limited.

oyun indir

thanks for the link

Rui Huang — Wed, 06 Aug 2008 11:02:14 -0400

Kodanda,

Thank you for the link to OpenDx. Will check it out later.

Re: program for mesh and results visualization

Kodanda Ram Mangipudi — Wed, 06 Aug 2008 05:06:48 -0400

Dear Prof. Rui Huang,

There is one free, actively developed, feature rich, easy to use program for visualizatio: OpenDx. This was initially developed by Intel and then given out for open development. www.opendx.org is the link. It can serve the purpose of any scientific resercher for visualization.

It has an easy interface for creating visualization macros which is just like drag, drop and connect the the modules with mouse.

Kodanda

meshfree code for non-linear lastoplastic equation

aswani006 — Wed, 06 Aug 2008 02:11:29 -0400

my name is aswin and i am doin my m.tech 2nd yr in IIT ROORKEE,INDIA

now i am doin project basedc on meshfree technique.

i am develop[ing code for elastoplastic problem

i have code for elastic pert.but i am not getting how to dvelop code for plastic part and how to solve that non-linear equation

please help me for my dessertation.

I doubt that the emergence

Christopher — Wed, 04 Jun 2008 04:32:15 -0400

I doubt that the emergence of an open-source trading platform is going to encroach upon the success of Portware and FlexTrade anytime soon, but it could offer firms more freedom to do things on their own at a lower price point.

please help me if you can

prabukarthi — Sat, 09 Feb 2008 08:18:37 -0500

iam doing my project in warm deep drawing i want to know how to do simulation of WDD using abaqus software

OS FEA and SML software

Julio Cesar Perez Franco — Mon, 07 Jan 2008 14:16:02 -0500

OFELI it's a fast and compact library to use with C++.

SciLab it's now an opensource SML and supports toolboxes

Maxima it's another opensource SML

Octave it's another opensource SML simmilar to mathlab

Their states are stable and mature production.

The convenience from OS it's mainly the fact that you can extend the software customizing it or adding functions or porting it to other platforms, and even if you get errors from it you can try to fix them, the OS model it's not for every one, and the thecnical support relies mostly on communities and lees in private enterprises.

If you're starting in business community software it's a very attractive solution, if you're getting bigger and timelines getting shorter you will be tempted to buy expensive software that includes faster and expert support.

Example of that is OpenCASCADE: They offer the OS openCascade but they also sells support and teachs you how to develop with it (and it's a huge and complex visualization library), VTK it's another example of it.

hi i would like to know about crack initiation and propagation

prashant sharma — Sat, 06 Oct 2007 14:58:28 -0400

i would like to know how i can use abaqus for crack initiation and proapation.

so gentle men , give me some solution.

regards

prashant

Antonio Caballero; e-mail:

acaballeroj — Tue, 04 Sep 2007 05:17:12 -0400

Antonio Caballero; e-mail: acaballeroj@civil.uwa.edu.au

Hi everybody. From my point of view is always develop to own FE code for two basic reasons:

First, this experience will teach you enormously!! I think that dealing with the tricky problems of the formulation and implementation is a key issue on the understanding of what is really doing a FE program.
On the other hand, you will be more able to expand it and correct it.

However, I aggre with the idea that developping your own code is a hard and very time costly task. For those of you that only require a open source FE code to use or to work with, here two more references:

http://www.cimne.com/kratos/

http://sokocalo.engr.ucdavis.edu/~jeremic/PDD/

Cheers

MechSys Open Library for Mechanical Systems

pedroso — Mon, 03 Sep 2007 03:03:17 -0400

Hi all,

I'm trying to maintain an open source/free software, named MechSys, which is a C++ library for the implementation of mechanical systems-related programs. The geomechanics discipline is my main subject, but I'm also interested in (several) others. Basically, there are 4 modules in the library (there are more in fact):

Numerical (numerical algorithms: RK, quadrature, Brent's method, etc.);
Tensors (tensorial analysis: invariants, projectors, determinants, eigenvalues, etc.);
LinAlg (linear algebra: dense, sparse, unsymmetric linear solvers, eigenvalues and eigenprojectors, etc.);
FEM (3D soil-water unsaturated coupled analysis with Runge-Kutta' global and local solvers);
Utils, Constmods, Models, VTKwrap, GUI, ...

All these modules are independent from each other and we can use them for future implementations (DEM, MPM, contact/fracture mechanics, multiscale, etc.). The main objective of this library was: 1) Ease of adding new models, elements, or solvers (for students, new developers, sharing, teamwork); and 2) High organization (with a management system - Concurrent Version System, and several code style conventions).

In fact, some well known open source libraries were wrapped into functions or classes. Such examples are the LAPACK, UMFPACK, SuperLU, and SuperLUd for dense and sparse linear solvers (including parallel). Some GNU Scientific routines were wrapped as well, for example: the QAGS for quadrature or numerical integration. I use Blender as a drawing tool, TetGen for mesh generation and ParaView for visualization; them all are free (and excellent) software.

Well, I hope it may be useful for someone.

Coding UMAT for ABAQUS

Kaifeng Liu — Mon, 09 Apr 2007 11:20:33 -0400

Ruogang,

I have been using abaqus for simulation of biomaterials with a viscoelastic-plastic constitutive model for two years. My experience with UMAT was somewhat delightful. Perhaps part of the reason is that my constitutive is relatively simple compared with biological cell. If you want to learn more about my experience, please do not hesitate to contact me.

I have one comment on Michelle's thread about the "poroelastic" model. In my sense, the term "biphasic poroelastic" is more clear. In fact, this is achieved by the *SOILS analysis in abaqus, which was designed for civil engineer to do soil consolidation/seepage analysis. Time-dependent behavior can be done in this analysis. If you feel fluid flow is quite important in your analysis, this might be a better choice than the single phase vicoelastic model.

Kaifeng

ELLPACK,KASKADE,PLTMG for ELLIPTIC PDE's

Roozbeh Sanaei — Sat, 24 Mar 2007 13:35:28 -0400

ELLPACK very high level, portable systems for solving elliptic boundary value problems. One can solve routine problems by simply writing them down and naming the methods to be used. One can solve harder problems by using the problem solving modules in the flexible ELLPACK framework. The ELLPACK language is an easy-to-learn extension of Fortran: this provides greatly reduced coding for most of the computation, but still allows one to do special processing. ELLPACK incorporates over 50 problem solving modules, including some of the best and most current software in the world. A knowledgeable user can even tailor ELLPACK itself by adding new problem solving or analysis modules.KASKADE and PLTMG are similar packages too

FENICS is a developing

Roozbeh Sanaei — Sun, 18 Mar 2007 15:39:17 -0400

FENICS is a developing Computatioal mechanics project with a great AIM.

Deal.ii (Free) and Diffpack(Commerical-1000$) are similar projects.

in this Time Diffpack-Feap(Commerical-800$) are two very Famous Packages available in finite element programming but they have some disadvantages first one because of its FORTRAN base and the last one because of it's cost.(OpenScience-OpenSource). Note That Each Package Have it's Properties and advantages, as an exampe CALFEM is not so famous but it has good procedures for vibration and acoustics or TAHOE is best in non-classical solid mehcanics, OOF2 for microsturctues and ....,

general finite element packages such as ELMER,DEAL.II,DOLFIN(Fenics), Adventure Project and PETSC-CS are growing but they are not expert in SPECIAL Subjects.

excuse me for my poor english.

What is the status of open source finite element code?

admin — Mon, 20 Nov 2006 16:59:03 -0500

FEMs are widely used in education, research, and industries. What is the prospect of having a vibrant community to evolve an open-source finite element code? What are the potential benefits for such a community and code? Has anybody tried?

Presumably whoever active in this effort may find support from government funding agencies and industries.