Read e-book online Boundary Integral Equation Methods and Numerical Solutions: PDF

By Christian Constanda, Dale R. Doty, William Hamill

ISBN-10: 3319263072

ISBN-13: 9783319263076

This ebook provides and explains a normal, effective, and chic procedure for fixing the Dirichlet, Neumann, and Robin boundary price difficulties for the extensional deformation of a skinny plate on an elastic starting place. The options of those difficulties are received either analytically—by technique of direct and oblique boundary fundamental equation equipment (BIEMs)—and numerically, in the course of the program of a boundary aspect procedure. The textual content discusses the technique for developing a BIEM, deriving all of the attending mathematical houses with complete rigor. The version investigated within the e-book can function a template for the learn of any linear elliptic two-dimensional challenge with consistent coefficients. The illustration of the answer when it comes to single-layer and double-layer potentials is pivotal within the improvement of a BIEM, which, in flip, varieties the foundation for the second one a part of the booklet, the place approximate suggestions are computed with a excessive measure of accuracy. The ebook is meant for graduate scholars and researchers within the fields of boundary imperative equation equipment, computational mechanics and, extra regularly, scientists operating within the components of utilized arithmetic and engineering. Given its specified presentation of the fabric, the booklet is also used as a textual content in a really expert graduate path at the functions of the boundary point way to the numerical computation of suggestions in a wide selection of difficulties.

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Extra info for Boundary Integral Equation Methods and Numerical Solutions: Thin Plates on an Elastic Foundation (Developments in Mathematics)

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The argument for x ∈ ∂ S and x ∈ S+ is similar to that in (i). x2 KR S x S S x1 Fig. 3 The domain S∗ . 3 Definition. 2 The Layer Potentials 19 where ϕ and ψ are 2-component vector functions defined on ∂ S, are called the single-layer potential and double-layer potential of density ϕ and ψ , respectively. 4 Theorem. If ϕ , ψ ∈ C(∂ S), then V ϕ , W ψ ∈ A . Proof. 17). 5 Theorem. (i) If ϕ , ψ ∈ C(∂ S), then V ϕ and W ψ are analytic in S+ ∪ S− and Z(V ϕ ) = Z(W ψ ) = 0 in S+ ∪ S− . (ii) If ϕ ∈ C0,α (∂ S), then V ϕ ∈ C0,α (R2 ).

But this is not necessarily the case. 8)). Typically, numerical quadrature is of the form ∑ wi f (xi ), i where the wi are the weights corresponding to the quadrature method and the xi are the quadrature points. In cases involving D, the numbers f (xi ) become extremely large for xi near the singularity. Therefore, although the relative error in the f (xi ) is small, the values of f (xi ) when the xi are in the neighborhood of the singular point can significantly contaminate the result of the numerical quadrature.

Iv) If ϕ ∈ C0,α (∂ S), then the direct values V0 ϕ and W0 ψ of V ϕ and W ψ on ∂ S exist, with the integral in W0 ψ understood as Cauchy principal value. 26) T (V − ϕ ) = W0∗ − 12 I ϕ , where W0∗ , the adjoint of the operator W0 , is defined by (W0∗ ϕ )(x) = (T (∂x )D(x, y))ϕ (y) ds(y), x ∈ ∂ S, ∂S with the integral understood as Cauchy principal value. (vi) The operators W + and W − defined by W +ψ = (W ψ )|S+ W0 − 12 I ψ in S+ , on ∂ S, W −ψ = (W ψ )|S− W0 + 12 I ψ in S− , on ∂ S map C0,α (∂ S) to C0,α (S¯± ) and C1,α (∂ S) to C1,α (S¯± ), α ∈ (0, 1), and T (W + ψ ) = T (W − ψ ) on C1,α (∂ S).

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Boundary Integral Equation Methods and Numerical Solutions: Thin Plates on an Elastic Foundation (Developments in Mathematics) by Christian Constanda, Dale R. Doty, William Hamill


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