Re: X-FEM mini-course

Dear Peter,

Peter Gottschling wrote:

> Dear Stéphane,
>
> Yes, you answered my questions and no, I don't think at all that you 
> bothered somebody by posting the announcement in this mailing list. My 
> questions had another motivation. Maybe you might have seen on the web 
> page that David Abrahams and I have started to develop a  new version 
> of MTL. One of my goals is that the MTL is widely applicable. 
> Therefore I am vividly interested in what it is used for and also 
> willing to extend the functionality to better support scientific 
> computing. There are serious plans to integrate MTL into PETSc. Part 
> of this collaboration with Argonne will be to provide a matrix format 
> for FEM codes, which is a list of element matrices that are dense and 
> for higher order elements large enough to benefit from dense matrix 
> performance enhancements.
>
> I would go even a step further: in scientific computing one has either 
> complete systems with there own data structure and a set of algorithms 
> that solves problems of a more or less narrow domain or one has 
> general-purpose numeric libraries that usually have the attitude to 
> pass the message "give me a matrix (dense or sparse) and a rhs vector 
> and I solve you a linear system (eventually a non-linear system) but 
> how do you get to this linear system is none of my business". (Maybe I 
> have bothered some people now.) I am thinking that a library like MTL 
> can be also useful in the process of setting up linear or non-linear 
> systems, i.e. FEM. Probably, the MTL is already helpful for this but I 
> have the feeling that an intense communication with FEM software 
> developer and their users can improve this further.

I would be happy to be part of this discussion.

> I am also playing with the idea to come to your mini-course and 
> eventually present something, if you are interested.

Ah! This would be nice. I would really enjoy meeting you. What would you 
like to talk about? How long would you like to talk? Would you be 
bringing other colleagues along with you? I am trying to build a network 
of people who share the same goals, and my aim with this course is to 
"demistify" the whole X-FEM concept, so that people can understand it 
better, thus code it more easily, thus contribute to the advancement of 
the field. If you know people, in industry or academia, who are likely 
to be interested, could you please forward them the course info?

>
> Best Regards,
>
> Peter
>
> P.S.: La commune des utilisateurs de MTL est d'ailleurs assez 
> francophone. J'avais récemment des communications intensives avec 
> Nantes et Rennes et je suis sûr ce-qu'il y'a encore des autres. Un 
> projet (où je m'engage aussi) pour établir des concepts et de logiciel 
> générique pour des systèmes d'algèbre linéaire ce-que est pour ça 
> relié très proche avec MTL (cf glas.sourceforge.net) est gérer en 
> Belgique.

Je suis tres impressionne'! Est-ce que "tu" (puis-je vous tutoyer? Ce 
sera moins formel), ecris aussi bien l'Allemand? Je pense qu'a Nantes, 
tu as converse' avec l'equipe de N. Moes, par contre, a Rennes, je ne 
connais pas le centre de calcul scientifique. Duquel s'agit-il? 
Pourrais-tu leur faire passer le message concernant le cours? Quant a la 
Belgique, c'est un vivier dans le domaine du numerique! Il semble que la 
concentration de chercheur dans le domaine soit plus haute qu'a Boston 
meme!! :)

Merci encore pour tout,

Stephane

>
> On Jul 25, 2005, at 8:32 AM, Stephane BORDAS wrote:
>
>> Dear Peter,
>>
>> Thank you for your reply. I believe indeed that people who use the 
>> MTL are likely to do computational work. Among these people, there is 
>> a good chance that a good share work on finite element methods, and 
>> may be interested in learning how the finite element method can be 
>> "extended" into the "Extended Finite Element Method" to solve complex 
>> problems such as crack growth, fluid-structure interaction, etc. In 
>> addition, the X-FEM allows to increase computational efficiency, when 
>> compared to FEM. People who use MTL are interested in efficiency, 
>> therefore, they probably are, also, interested in X-FEM.
>>
>> The MTL will not be presented, but I am working with some 
>> collaborators on a new X-FEM implementation in which MTL may be used 
>> to handle the linear algebra.
>>
>> Did I answer your question? I hope that I have not bothered too many 
>> people by posting this message here, but I truly feel that users of 
>> the MTL are likely to take advantage of the course we are offering.
>>
>> I would welcome any comment, by anyone, on any of the above.
>>
>> Thank you, and best regards to you, Peter, and to the whole list 
>> (many people, that is, :),
>>
>> Stephane
>>
>>
>>
>> Peter Gottschling wrote:
>>
>>> Dear Stéphane,
>>>
>>> Thank you for this information. Can you please say a few words how  
>>> tutorial and/or software is related to the MTL. Is it used in the  
>>> framework, is it a potential application for your framework, will 
>>> the  MTL be presented in the mini-course, or is it just that you 
>>> think that  the same people are interested in your FEM work and the 
>>> MTL? Thank you  in advance.
>>>
>>> Best Regards,
>>>
>>> Peter
>>>
>>> On Jul 19, 2005, at 5:52 AM, Stephane BORDAS wrote:
>>>
>>>> Dear colleagues,
>>>>
>>>> This is to announce an eXtended Finite Element mini-course at EPFL,
>>>> Lausanne, Switzerland, December 7-9 2005
>>>>
>>>> http://continuing-education.epfl.ch/Jahia/site/continuing-education/ 
>>>> op/preview/lang/en/pid/12861
>>>>
>>>> This method allows to treat free-boundary, singularities, strong and
>>>> weak discontinuities seamlessly within an FEM framework.
>>>>
>>>> Please contact me if you are interested in attending, and pass this
>>>> information around you if you see fit.
>>>>
>>>> Thank you, and best regards,
>>>>
>>>> Stephane
>>>>
>>>> -- 
>>>> _________________________________________________________________
>>>> Stephane Bordas
>>>> http://www.tam.northwestern.edu/sbordas
>>>>
>>>> Laboratory of structural and continuum mechanics
>>>> Laboratoire de mécanique des structures et milieux continus (LSC)
>>>> EPFL/ENAC/IS/LSC GC A2 454
>>>> Station 18 EPFL-LSC, Ecublens CH-1015 Lausanne
>>>> Suisse/Switzerland/Schweiz
>>>>
>>>> Tél: +41 21 693 24 03 Fax: +41 21 693 63 40
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> This list is archived at http://www.osl.iu.edu/MailArchives/mtl-devel/
>>>>
>>> ------------
>>> Peter Gottschling
>>> Research Associate
>>> Open Systems Laboratory
>>> Indiana University
>>> 301i Lindley Hall
>>> Bloomington, IN 47405
>>> Tel.: +1 812 855-8898   Fax: +1 812 856 0853
>>> http://www.osl.iu.edu/~pgottsch
>>>
>>>
>>
>> -- 
>> _________________________________________________________________
>> Stephane Bordas
>> http://www.tam.northwestern.edu/sbordas
>>
>> Laboratory of structural and continuum mechanics
>> Laboratoire de mécanique des structures et milieux continus (LSC)
>> EPFL/ENAC/IS/LSC GC A2 454
>> Station 18 EPFL-LSC, Ecublens CH-1015 Lausanne
>> Suisse/Switzerland/Schweiz
>>
>> Tél: +41 21 693 24 03 Fax: +41 21 693 63 40
>>
>>
>>
>>
> ------------
> Peter Gottschling
> Research Associate
> Open Systems Laboratory
> Indiana University
> 301i Lindley Hall
> Bloomington, IN 47405
> Tel.: +1 812 855-8898   Fax: +1 812 856 0853
> http://www.osl.iu.edu/~pgottsch
>
>

-- 
_________________________________________________________________
Stephane Bordas
http://www.tam.northwestern.edu/sbordas

Laboratory of structural and continuum mechanics
Laboratoire de mécanique des structures et milieux continus (LSC)
EPFL/ENAC/IS/LSC GC A2 454
Station 18 EPFL-LSC, Ecublens CH-1015 Lausanne
Suisse/Switzerland/Schweiz

Tél: +41 21 693 24 03 Fax: +41 21 693 63 40




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