By Alfredo Bermúdez, Rodolfo Rodríguez, Pilar Salgado (auth.), Miloslav Feistauer, Vít Dolejší, Petr Knobloch, Karel Najzar (eds.)

ISBN-10: 3642187757

ISBN-13: 9783642187759

ISBN-10: 3642622887

ISBN-13: 9783642622885

These lawsuits acquire the key a part of the lectures given at ENU­ MATH2003, the ecu convention on Numerical arithmetic and advert­ vanced purposes, held in Prague, Czech Republic, from 18 August to 22 August, 2003. the significance of numerical and computational arithmetic and sci­ entific computing is completely starting to be. there's increasingly more various learn components, the place numerical simulation is important. allow us to males­ tion fluid dynamics, continuum mechanics, electromagnetism, section transi­ tion, cosmology, drugs, economics, finance, and so on. The luck of purposes of numerical tools is conditioned by means of altering its uncomplicated tools and seeking out new applicable suggestions tailored to new difficulties in addition to new laptop architectures. The ENUMATH meetings have been validated with a view to supply a fo­ rum for dialogue of present issues of numerical arithmetic. They search to convene prime specialists and younger scientists with precise emphasis on con­ tributions from Europe. contemporary effects and new developments are mentioned within the research of numerical algorithms in addition to of their purposes to tough medical and commercial difficulties. the 1st ENUMATH convention used to be geared up in Paris in 1995, then the sequence persevered through the meetings in Heidelberg 1997, Jyvaskyla 1999 and Ischia Porto 2001. It was once an exceptional excitement and honour for the Czech numerical neighborhood that it was once determined at Ischia Porto to arrange the ENUMATH2003 in Prague. It was once the 1st time while this convention crossed the previous Iron Courtain and was once equipped in a postsocialist country.

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Extra info for Numerical Mathematics and Advanced Applications: Proceedings of ENUMATH 2003 the 5th European Conference on Numerical Mathematics and Advanced Applications Prague, August 2003

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Theorem 3. Under the above assumptions, the decomposition V = VI + ... + Vrn with the local FE spaces (22) fulfils the assumptions (A1), (A2) with the constants (23) 26 R. Blaheta Remark 3. The proof of Theorem 3 can be found in the works of M. Dryja and O. Widlund, see the books [13, 20] and the references given there. We sketch the proof here, because it contains ideas important for understanding the further development of the method in the next sections. Sketch of the proof. - For the overlapping domain decomposition, there is a partition of the unity 8 1, ...

N}, n E N. (4) For i E 1, ... , N -1, one takes F21-! = g(wi, wi+1)' where 9 is the numerical flux. It has to satisfy, in particular, the classical consistency condition, namely g(a, a) = F(a), and needs to be chosen in order to obtain some stability properties for the numerical scheme under a so called CFL condition on the time step (see Sect. 3 for the study of a scalar model). In the case of two phase flow in a pipeline, the classical numerical fluxes such as the Godunov flux (see [9]) or the Roe flux (see [11]) may not be implemented, because of computational difficulties.

M . 30 R. Blaheta m L m Ilvkll~ ~ 1\:2 k=1 L m IVkl~l(DO k=1 ~ 1\:2 fL me [5- ~ 1\:2 fL me [()~ 5- ~ c [1 + h- I H + 5- 2 H2] 2 1I v - vaIIL(D) + Iv - Val~l(D)] 2 H2 + 2 + 2i7r ~] IvIJ-J1(D) Ilvll~. - The above estimates give (30). The estimate of KI is the same as in Theorem 4. g. [3] and the references therein. The properties of the basis functions {'ljJd can be improved by smoothing and the smoothed aggregations can be again used in two-level Schwarz preconditioners, see [11]. Note that the paper [15] describes the use of massive aggregation, which means aggregation of all degrees of freedom in each subdomain.

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Numerical Mathematics and Advanced Applications: Proceedings of ENUMATH 2003 the 5th European Conference on Numerical Mathematics and Advanced Applications Prague, August 2003 by Alfredo Bermúdez, Rodolfo Rodríguez, Pilar Salgado (auth.), Miloslav Feistauer, Vít Dolejší, Petr Knobloch, Karel Najzar (eds.)


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