Boundary Elements: Implementation and Analysis of Advanced by Bernd H. Kleemann, Andreas Rathsfeld (auth.), Wolfgang

By Bernd H. Kleemann, Andreas Rathsfeld (auth.), Wolfgang Hackbusch, Gabriel Wittum (eds.)

The GAMM Committee for "Efficient Numerical tools for Partial Differential Equations" organizes seminars and workshops on matters about the algorithmic remedy of partial differential equations. the themes are discretisation tools just like the finite point and the boundary point approach for varied kind of functions in struc­ tural and fluid mechanics. specific realization is dedicated to complex answer method". the newest seminar during this sequence was once the twelfth Kiel-Seminar which happened on January 19-21, 1996 at Christian-Albrechts-University of Kiel and focussed at the subject Boundary components: Implementation and research of complicated Algorithms. The seminar used to be attended via sixty five scientists from 10 nations. 23 lectures got, together with survey lectures. within the final years, a impressive growth within the numerical therapy of boundary de­ ment tools (BEM) has been bought in Germany. this is often, specifically, a res~I1t of a Schwerpunktverfahren supported by way of the DFG. Many elements of the BEM usually are not ouly analysed but additionally carried out. for that reason, those court cases current a couple of papers on implementational points along with the research of complicated techniques.

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Example text

Let f be a piecewise analytic, orient able Lipschitz surface of a bounded domain n c R3. , in the book of Adams [1]. , ·)0 denotes the L2-scalar product. I. £ k; (x, y) u (y) dy where the integral has to be understood in the finite part sense (see [16]) and ki denotes the kernel functions. The functions Ai : f -+ R are assumed to be piecewise constant on 30 smooth patches of the surface and may jump across corners and edges. , s~ = -S1 2s 2. The left-hand side of (1) defines the bilinear forms a, all a2 : HSI (f) x HSI (f) ~ «: as follows a1 (u,v) a2 (u, v) = (V,A1 U)O' = (v,K1u)o' The right-hand side defines the functionals F, Fl, F2 : HSI (2) ~ «: : F1 (v) := (v, A2J)O' F2 (v) := (v, Kd)o' F :=F1 +F2.

For weakly or Cauchy singular kernels we put k~~g = k and m1 = m2 = o. - y - x and 112 iJ2 8nx 8n y Ilx 1 _ yll' The following representation is proved in [10]) a (u, v) := -lr (-n (x) x \7 x) u (x) lr Ilx ~ yll (n (y) x \7 y ) v (y) dydx. J. We state that for much more general kernel functions such representation are available, too (see [10], [6], [7], [5], [3]). Another approach is presented in [8] which can be treated by a slight modification of the cubature techniques below. We are now ready for the presentation of the cubature techniques.

4. "Regular Case": K x and K yare disjoint. Condition (6) does not guarantee that every pair K x, Ky E r satisfies one of the four cases listed above. However, it is clear that one of the panels K x, Ky can be subdivided such that the arising sub-panels satisfy one of the conditions above. The methods presented below then have to be applied to the sub-panels. Hence, we assume for the following that any pair of panels Kx x Ky satisfies one and only one of the conditions above. In the following we will discuss these four cases in detail.

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