[SciPy-User] Simulations

Thu Oct 8 03:34:18 EDT 2009

Hey Cesar and David,
I thought about this and I think I better stick to the "Do one thing well"
principle for now. Thanks for the insight though.

Ram.

On Tue, Oct 6, 2009 at 9:23 PM, Cesar Koers <ckoers at telenet.be> wrote:

> Hi Ram,
>
>
> A specific type of time domain solver for electromagnetics is e.g. TDFD
> = time domain finite difference. It is based on discretizing Maxwell
> equations in time & space
>
> But the Maxwell equations can also be expressed in the frequency domain
> (thus for every frequency instead of every time instant). This leads to
> FDFD = frequency domain finite difference.
>
> Other kinds of models, like based on finite elements (FE) can also be
> developed in the frequency domain.
>
> Perhaps you're now thinking that your 'step function' would still work
> in the frequency domain (response at frequency f_{i+} as a function of
> response at frequency f_i), but this doesn't work (to my knowledge)
> because it requires that the system is modeled by differential equations
> in the frequency domain (haven't encountered this before)
>
>
> Ah and some other 'bureaucracy' features:
> * tracking time spent / calculating time remaining till end
> * refining/coarsening time step to improve accuracy/reduce simulation
> time respectively
>
> best regards
>
> C
>
>
> cool-RR wrote:
> > Hey Cesar,
> >
> > Your comments are interesting.
> >
> > Can you explain to me a bit about frequency domain simulations? Can you
> > give an example of a simulation simulating a real world process?
> >
> > I agree that GarlicSim must handle the bureaucracy well, as its job is
> > to let the user write a simulation with as little bureaucracy as
> possible.
> >
> > P.S. I registered garlicsim.org <http://garlicsim.org> and it is now the
> > main domain.
> >
> > Ram.
> >
> > On Mon, Oct 5, 2009 at 9:11 PM, Cesar Koers <ckoers at telenet.be
> > <mailto:ckoers at telenet.be>> wrote:
> >
> >     Hi Ram,
> >
> >
> >     I quickly read through your intro doc, I think you've explained your
> >     idea quite well.
> >
> >     One remarks though: I think your framework would fit well to
> time-domain
> >     (transient) models. But at this moment I don't see how you could cast
> a
> >     frequency domain simulation (commonly used in EM solvers) in it. I'd
> be
> >     careful with the idea that 'all simulations' fit into this.
> >
> >     What I think is key to success of this kind of framework is how well
> it
> >     handles the 'bureaucracy' of performing simulations (and speed, but
> >     you've already mentioned that the actual number crunching is up to
> the
> >     user of the GarlicSim). With this, I mean the boring stuff, like
> e.g.:
> >
> >     * keeping track of which parameters vary between simulations
> >     * extracting data from a set of simulations as a function of one of
> >     these parameters
> >     * storing (and backing up) simulation results without taking up too
> much
> >     space and needing to invent unique and descriptive file names
> >     * being able to redo a simulation (storing simulation parameters with
> >     results)
> >     * making simulation reports
> >     * comparing results with real-world data
> >     * for long simulations, being able to continue simulation after a
> crash
> >
> >     Just my 2 cents
> >
> >     Best regards
> >
> >     C
> >
> >
> >     cool-RR wrote:
> >      > Hello,
> >      >
> >      > This is not directly related to SciPy; I'm posting it here because
> I
> >      > figure that there may be people here who know the scientific
> >     computing
> >      > world enough to help me with my question.
> >      >
> >      > I've been working on an open-source scientific computing project
> for
> >      > about 6 months now, and I've come to the conclusion that it's
> >     about time
> >      > to find other users except myself for it, so I may get valuable
> >     feedback
> >      > about which direction I should be taking this project.
> >      >
> >      > The project is called GarlicSim (http://garlicsim.com
> >      > <http://garlicsim.com/>). It's a Pythonic platform for working
> with
> >      > simulations. You may read more about it on the webpage. In short,
> >     it's a
> >      > very general framework for creating, running and analyzing
> >     simulations.
> >      > It's not specific to any scientific field; Its role is to provide
> a
> >      > general mold into which all simulations can be cast. If you want
> >     to know
> >      > more about it you can also read a (yet-incomplete) introduction
> >      >
> >     <
> http://dl.getdropbox.com/u/1927707/Introduction%20to%20GarlicSim.doc>
> >     to
> >      > it.
> >      >
> >      > So what I want to know is, who would be good potential first
> >     users for
> >      > this, and how could I reach them?
> >      > I'm not even sure which scientific field I would like to target,
> so
> >      > please suggest.
> >      >
> >      >
> >      > Thanks,
> >      > Ram Rachum
> >      >
> >      >
> >      >
> >
> ------------------------------------------------------------------------
> >      >
> >      > _______________________________________________
> >      > SciPy-User mailing list
> >      > SciPy-User at scipy.org <mailto:SciPy-User at scipy.org>
> >      > http://mail.scipy.org/mailman/listinfo/scipy-user
> >
> >     --
> >     Gaetan Cesar Koers
> >     Kerkveldweg 82
> >     1851 Humbeek
> >     +32(0)486 20 11 16
> >     _______________________________________________
> >     SciPy-User mailing list
> >     SciPy-User at scipy.org <mailto:SciPy-User at scipy.org>
> >     http://mail.scipy.org/mailman/listinfo/scipy-user
> >
> >
> >
> >
> > --
> > Sincerely,
> > Ram Rachum
> >
> >
> > ------------------------------------------------------------------------
> >
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> > SciPy-User at scipy.org
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>
> --
> Gaetan Cesar Koers
> Kerkveldweg 82
> 1851 Humbeek
> +32(0)486 20 11 16
> _______________________________________________
> SciPy-User mailing list
> SciPy-User at scipy.org
> http://mail.scipy.org/mailman/listinfo/scipy-user
>

-- 
Sincerely,
Ram Rachum
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