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finite element methods

finite element methods

(OP)
Hii all
Im new to this forum. I have certain doubts regarding fem.
1.Why scientists use programming in fem using fortran/phython/matlab when we are having advanced softwares?
2.what is explicit finite element and extended fem?

RE: finite element methods

If you are asking why people bother to build their own pre and post processors, which then hook in to custom solvers, rather than using 'advanced software', then I suppose the answer is often flexibility, and perhaps cost. As an example, I wished to build an optimised spaceframe, from a range of commercially available tube sizes. At the time there was no product available that would work through the palette of available tubes for every location in the spaceframe, leaving me with the alternative of either writing a script that generated the input files for a commercial solver, and which then analysed the output files, or else doing the whole job inside matlab with the openfem solver. In terms of complexity there wasn't much in it, but the time constraint of writing out text files and so on was avoided by working inside matlab entirely, and it was one less layer of debugging. Plus of course plotting the progress and results was a breeze inside matlab.

I have used both approaches, and if you have a bulletproof way of writing and reading text files (say QBasic) I'd actually recommend that if you have easy command line access to a good fem solver.

Cheers

Greg Locock


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RE: finite element methods

(OP)
Thanks GregLocock for the replay!
Im doing masters in Structural engineering and final year thesis in aerospace engineering (using CFD,ALE coupling) now only I fell In love with finite element methods. Could you please suggest me some pdf/ebooks to start fem programming using matlab,For beginner.

RE: finite element methods

RE: finite element methods

Quote (cjstruct)

...

1.Why scientists use programming in fem using fortran/python/matlab when we are having advanced softwares?

...

What is advanced software? You are doing calculations. You need to be able to do math, you need to manage arrays, and you need logic. Current versions of Fortran are structured. C does not do exponents. I can see the reason for object oriented programming, but it is a pain for small projects and applications.

FEA software should be written by structural analysis geeks, not programming geeks.

--
JHG

RE: finite element methods

Finite elements have %5-10 validity in their results which means you do not need to do so many tests.
Otherwise you would spend a lot of time on it.

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