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A projection transformation method for nearly singular surface boundary element integrals

Author: K Hayami
Publisher: Berlin ; New York : Springer-Verlag, ©1992.
Series: Lecture notes in engineering, 73.
Edition/Format:   Print book : EnglishView all editions and formats
Summary:

In three dimensional boundary element analysis, computation of integrals is an important aspect since it governs the accuracy of the analysis and also because it usually takes the major part of the  Read more...

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Additional Physical Format: Online version:
Hayami, K. (Ken), 1956-
Projection transformation method for nearly singular surface boundary element integrals.
Berlin ; New York : Springer-Verlag, ©1992
(OCoLC)645894994
Document Type: Book
All Authors / Contributors: K Hayami
ISBN: 3540550003 9783540550006 0387550003 9780387550008
OCLC Number: 25246388
Description: x, 456 pages : illustrations ; 25 cm.
Contents: I Theory and Algorithms.- 1 Introduction.- 2 Boundary Element Formulation of 3-d Potential Problems.- 2.1 Boundary Integral Equation.- 2.2 Treatment of the Exterior Problem.- 2.3 Discretization into Boundary Elements.- 2.4 Row Sum Elimination Method.- 3 Nature of Integrals in 3-d Potential Problems.- 3.1 Weakly Singular Integrals.- 3.2 Hyper Singular Integrals.- 3.3 Nearly Singular Integrals.- 4 Survey of Quadrature Methods for 3-d Boundary Element Method.- 4.1 Closed Form Integrals.- 4.2 Gaussian Quadrature Formula.- 4.3 Quadrature Methods for Singular Integrals.- (1) The weighted Gauss method.- (2) Singularity subtraction and Taylor expansion method.- (3) Variable transformation methods.- (4) Coordinate transformation methods.- 4.4 Quadrature Methods for Nearly Singular Integrals.- (1) Element subdivision.- (2) Variable transformation methods.- (3) Polar coordinates.- 5 The Projection and Angular & Radial Transformation (Part) Method.- 5.1 Introduction.- 5.2 Source Projection.- 5.3 Approximate Projection of the Curved Element.- 5.4 Polar Coordinates in the Projected Element.- 5.5 Radial Variable Transformation.- (i) Weakly Singular Integrals.- (ii) Nearly Singular Integrals.- (1) Singularity cancelling radial variable transformation.- (2) Consideration of exact inverse projection and curvature of the element in the transformation.- (3) Adaptive logarithmic transformation (log-L2).- (4) Adaptive logarithmic transformation (log-L1).- (5) Single and double exponential transformations.- 5.6 Angular Variable Transformation.- (1) Adaptive logarithmic angular variable transformation.- (2) Single and double exponential transformations.- 5.7 Implementation of the PART method.- (1) The use of Gauss-Legendre formula.- (2) The use of truncated trapezium rule.- 5.8 Variable Transformation in the Parametric Space.- 6 Elementary Error Analysis.- 6.1 The Use of Error Estimate for Gauss-Legendre Quadrature Formula.- 6.2 Case ss = 2 (Adaptive Logarithmic Transformation: log-L2).- 6.3 Case ss = l Transformation.- 6.4 Case ss = 3 Transformation.- 6.5 Case ss = 4 Transformation.- 6.6 Case ss = 5 Transformation.- 6.7 Summary of Error Estimates for ss=1~5.- 6.8 Error Analysis for Flux Calculations.- 7 Error Analysis using Complex Function Theory.- 7.1 Basic Theorem.- 7.2 Asymptotic Expression for the Error Characteristic Function ?n(z).- 7.3 Use of the Elliptic Contour as the Integral Path.- 7.4 The Saddle Point Method.- 7.5 Integration in the Transformed Radial Variable: R.- 7.6 Error Analysis for the Identity Transformation: R(?) = ?.- (1) Estimation of the size ? of the ellipse ??.- (2) Estimation of max | f(z) | z???.- (3) Error estimate En(f).- 7.7 Error Analysis for the log-L2 Transformation.- (1) Case: ? = odd.- (2) Case: ? = even.- (i) Contribution from the branch line l+, l-.- (ii) Contribution from the ellipse ??.- (iii) Contribution from the small circle C?.- (iv) Summary.- 7.8 Error Analysis for the log-L1 Transformation.- (1) Error analysis using the saddle point method.- (2) Error analysis using the elliptic contour: ??.- (i) Estimation of max | f(z) | z???.- (ii) Estimation of ?.- (iii) Error estimate En(f).- 7.9 Summary of Theoretical Error Estimates.- II Applications and Numerical Results.- 8 Numerical Experiment Procedures and Element Types.- 8.1 Notes on Procedures for Numerical Experiments.- 8.2 Geometry of Boundary Elements used for Numerical Experiments.- (1) Planar rectangle (PLR).- (2) `Spherical' quadrilateral (SPQ).- (3) Hyperbolic quadrilateral (HYQ).- 9 Applications to Weakly Singular Integrals.- 9.1 Check with Analytial Integration Formula for Constant Planar Elements.- 9.2 Planar Rectangular Element with Interpolation Function ?ij.- 9.3 `Spherical' Quadrilateral Element with Interpolation Function ?ij.- (1) Results for ?S?iju* dS.- (2) Results for ?S?ijq* dS.- 9.4 Hyperbolic Quadrilateral Element with Interpolation Function ?ij.- (1) Results for ?s?iju* dS.- (2) Results for ?s?ijq*dS.- 9.5 Summary of Numerical Results for Weakly Singular Integrals.- 10 Applications to Nearly Singular Integrals.- 10.1 Analytical Integration Formula for Constant Planar Elements.- 10.2 Singularity Cancelling Radial Variable Transformation for Constant Planar Elements.- 10.3 Application of the Singularity Cancelling Transformation to Elements with Curvature and Interpolation Functions.- (1) Application to curved elements.- (2) Application to integrals including interpolation functions.- 10.4 The Derivation of the log-L2 Radial Variable Transformation.- (1) Application of radial variable transformations ?d? = r'?dR (ss? ?) to integrals ?s 1/r?dS over curved elements.- (2) Difficulty with flux calculation.- 10.5 The log-L1 Radial Variable Transformation.- 10.6 Comparison of Radial Variable transformations for the Model Radial Integral I?,?.- (1) Transformation based on the Gauss-Legendre rule.- (i) Identity transformation.- (ii) log-L2 transformation.- (iii) log-L1 transformation.- (2) Transformation based on the truncated trapezium rule.- (i) Single Exponential (SE) transformation.- (ii) Double Exponential (DE) transformation.- (3) Summary.- 10.7 Comparison of Different Numerical Integration methods on the `spherical' Element.- (1) Effect of the source distance d.- (2) Effect of the position of the source projection xs.- 10.8 Summary of Numerical Results for Nearly Singular Integrals.- 11 Applications to Hypersingular Integrals.- 12 Conclusions.- References.
Series Title: Lecture notes in engineering, 73.
Responsibility: K. Hayami.

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