As distributed, FElt can solve the classic problems in linear statics and linear dynamics for both structural and thermal mechanics (i.e., problems of the form Kd = F, Md'' + Cd' + Kd = F , or Md' + Kd = F). It can also solve the generalized eigenvalue problem (K - lM)x = 0 and use this information in modal analysis. It can do spectral (frequency domain) analysis of transient structural problems. Nonlinear static analysis is in the works with the first cut being a simplistic static substitution scheme. The element library consists of truss, beam (Timoshenko and Euler), constant strain triangular, bilinear planar isoparametric, axisymmetric, plate bending (selective reduced integration quadrilateral), isoparametric solid (eight node brick) elements, and rod and constant temperature gradient thermal elements.
Unless it fits into one of the classes above there are no built-in solvers for your type of problem. You may be able to use burlap to write your own solver though.
The latest version of FElt, in all its incarnations, is always available via anonymous ftp from felt.sourceforge.net in pub/FElt. Information is available on the Web if you want to take a more serious look at some of FElt's capabilities before you actually take it for a test drive on your machine. There is an ftp mirror site at ftp.isd.uni-stuttgart.de in pub/src/FEM/Felt.
The complete version of FElt (including the X11 based graphical user interfaces) has compiled and tested on HPs, DECs, Suns, SGIs, Linux x86 and AXP, and IBM workstations. It should do the same on any reasonable Unix system with X11R5 or R6. In general we provide binaries for Sparc stations running SunOS or Solaris and x86s with Linux, but there is no guarantee that the binaries are as up to date as the source code. When in doubt just grab the source code and build it yourself - really, it's easy.
DOS executables are available for the command-line applications felt, corduroy, yardstick, burlap, and patchwork. A simple graphical application, feltvu is also available. You need to have at least a 386 to use the DOS versions. As of v3.02 we have switched to DJGPP v2.0 and the DOS versions should run under Windows 3.1. Also as of v3.02, there are 32-bit Windows (95 and NT) versions of all the programs (including velvet). You need X server software to make velvet work of course. DOS versions are not available for releases after v3.02. For later versions you can compile it yourself or get WinFElt (which will continue to be supported).
With the release of WinFElt, yes there is. After an extended beta period of WinFElt v1.0 for both Windows 95 and Windows 3.1, WinFElt v1.1 for Windows 95 and Windows NT is now available. There is no velvet-like CAD-style native Windows interface, however, and we're probably not the folks to write it as neither of us have much experience with Windows programming. There may be people working on this - let us know if you're thinking about something like it and we'll try our best to make sure that people don't duplicate a lot of effort.
Send one of us email (firstname.lastname@example.org or email@example.com). Please, please, please, include as much information as possible in your report. Things that are absolutely essential:
There are two mailing lists. One for new version announcements only and one for general FElt discussion. Visit the appropriate list information page, FElt-announce or FElt-users, to subscribe. Major release announcements will also be made to the following newsgroups: comp.os.linux.announce, sci.math.num-analysis, sci.engr, sci.engr.civil, and sci.engr.mechanical.
Well, FElt is obvious, right? Finite ELemenT. felt the application came first - it's the most basic interface into the system. Now when it comes to fabrics, everybody knows that velvet is smoother than felt ... thus the slickest GUI interface is called velvet. xfelt is simply xfelt because it is nothing more than an encapsulator, with no real functionality beyond that provided by felt.
After this, we start to stretch because with the felt - velvet connection we have this fabric motif to keep up on.
- Burlap is rough but functional, just like its namesake fabric. It may not be as easy to use as velvet (or maybe it is if you like scripting in Matlab-like mathematical languages) but you can do an awful lot with it.
- Corduroy has that regular ripple effect so its sort of like a mesh ...
- Patchwork, well we figured that was better than convert simply to avoid conflicts. How many systems have some local app called convert to do whatever, or how many little hacks are there called convert. It seemed common enough to us that we figured we might as well call it something different. Patchwork implies a lot of different fabrics coming together so it seemed as good as anything else.
- A yardstick is used to measure fabric ... measuring implies some sort of units.
Back to the FElt Demo Document.