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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24360

Title: An alternative method for degenerate scale problems in boundary element methods for the two-dimensional Laplace equation
Authors: J.T. Chen;C.F. Lee;I.L. Chen;J.H. Lin
Contributors: NTOU:Department of Harbor and River Engineering
Keywords: Boundary element method;Degenerate scale;Degenerate kernel;Combined Helmholtz exterior integral equation formulation concept;Fourier series
Date: 2002-07
Issue Date: 2011-10-20T08:11:44Z
Publisher: Engineering Analysis with Boundary Elements
Abstract: Abstract:The boundary integral equation approach has been shown to suffer a nonunique solution when the geometry is equal to a degenerate scale for a potential problem. In this paper, the degenerate scale problem in boundary element method for the two-dimensional Laplace equation is analytically studied in the continuous system by using degenerate kernels and Fourier series instead of using discrete system using circulants [Engng Anal. Bound. Elem. 25 (2001) 819]. For circular and multiply-connected domain problems, the rank-deficiency problem of the degenerate scale is solved by using the combined Helmholtz exterior integral equation formulation (CHEEF) concept. An additional constraint by collocating a point outside the domain is added to promote the rank of influence matrix. Two examples are shown to demonstrate the numerical instability using the singular integral equation for circular and annular domain problems. The CHEEF concept is successfully applied to overcome the degenerate scale and the error is suppressed in the numerical experiment. (C) 2002 Elsevier Science Ltd. All rights reserved.
Relation: 26(7), pp.559-569
URI: http://ntour.ntou.edu.tw/handle/987654321/24360
Appears in Collections:[河海工程學系] 期刊論文

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