yade-users team mailing list archive

["Feng, Chen" <fchen3@xxxxxxx>]

It seems not only Andreas Plesch but me also wants to contact the author of 
the SDECLinkedSpheres program:-)))

>===== Original Message From Janek Kozicki <janek_listy@xxxxx> =====
>Andreas Plesch said:     (by the date of Mon, 24 Oct 2005 13:14:56 -0700 
(PDT))
>
>> I thought it may have been an issue with version .911
>> so I checked out the current .924 from svn. Loading
>> the LinkedSpheres .xml and starting the simulation I
>> get now:
>>
>> yade: /usr/include/boost/shared_ptr.hpp:253: T*
>> boost::shared_ptr<T>::operator->() const [with T =
>> SpheresContactGeometry]: Assertion `px != 0' failed.
>> Aborted
>>
>> Not sure if I should start filing bugs ? Those issues
>> may still be all installation related ?
>
>you can file a bug if you want ;)
>
>Jean-Patrick Plassiard is the author of formulas for DEM with moment
>law. A year ago, his formulas were not fully developed and contained
>many errors. But we ignored the errors and implemented the formulas
>anyway. Current version of moment law in yade is inherently broken.
>
>It works for a very narrow range of stiffenesses, and it was working
>just after we implemented it. Many months later after several cleanups
>the 'inherent brokeness' showed itself and I was unable to get it back
>to work with whatever stiffness combination I tried. The fault is in
>fact on yade side, not on the formulas side - we just did it too quick,
>without proper consideration of everything that should be done.
>
>But heads up! Jean-Patrick has recently finished his work on the
>formulas (after two years), and they are now all correct. He will
>publish a scientific paper about them, defend his PhD and all that
>stuff. Currently I'm waiting to receive those formulas from him in a
>manner that makes them eligible for implementing them. Only after that
>SDECLinkedSpheres will work.
>
>But - it all must take some time. If I do it alone - you shouldn't expect
>it sooner than in 6 months.
>
>If you want to contact Jean-Patrick and try to implement the formulas
>yourself (where I will supervise your work) - you are welcome to. By
>such way you should have it much faster (maybe 2 or 3 months).
>Just say if you want to, then I will contact him.
>
>--
>Janek Kozicki                                                         |
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