Asymptotic modelling of conductive thin sheets
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We derive and analyse models which reduce conducting sheets of a small thickness ε in two dimensions to an interface and approximate their shielding behaviour by conditions on this interface. For this we consider a model problem with a conductivity scaled reciprocal to the thickness ε, which leads to a nontrivial limit solution for ε → 0. The functions of the expansion are defined hierarchically, i.e. order by order. Our analysis shows that for smooth sheets the models are well defined for any order and have optimal convergence meaning that the H 1-modelling error for an expansion with N terms is bounded by O(ε N+1) in the exterior of the sheet and by O(ε N+1/2) in its interior. We explicitly specify the models of order zero, one and two. Numerical experiments for sheets with varying curvature validate the theoretical results.
Mathematics Subject Classification (2000)65N30 35C20 35J25 41A60 35B40 78M30 78M35
KeywordsAsymptotic expansions Model reduction Thin sheets
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- 10.Concepts Development Team. Webpage of Numerical C++ Library Concepts 2. http://www.concepts.math.ethz.ch (2008)
- 19.Leontovich, M.A.: On approximate boundary conditions for electromagnetic fields on the surface of highly conducting bodies (in russian). Research in the propagation of radio waves, pp. 5–12. Moscow, Academy of Sciences (1948)Google Scholar
- 23.Péron V., Poignard, C.: Approximate transmission conditions for time-harmonic Maxwell equations in a domain with thin layer. Research Report RR-6775, INRIA (2008)Google Scholar
- 24.Poignard, C.: Approximate transmission conditions through a weakly oscillating thin layer. Math. Methods Appl. Sci. 32, 4 (2009)Google Scholar
- 26.Sauter S., Schwab C.: Randelementmethoden, B.G. Teubner-Verlag, Stuttgart (2004)Google Scholar
- 27.Schmidt, K.: High-order numerical modelling of highly conductive thin sheets. PhD thesis, ETH Zürich (2008)Google Scholar
- 29.Shchukin A.N.: Propagation of Radio Waves (in russian). Svyazizdat, Moscow (1940)Google Scholar