TY  - EJOU
AU  - Kuo, C.-L. 
AU  - Liu, C.-S. 

TI  - A moving modified Trefftz method for inverse Laplace problems in two dimensional multiply-connected domain
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2009
VL  - 11
IS  - 3
SN  - 1933-2815

AB  - In this paper, the inverse problems in a multiply connected domain governed by the Laplace equation have been investigated numerically by the developed moving modified Trefftz method. When solving the direct Laplace problem with the conventional Trefftz method, one may treat the ill-posed linear algebraic equations because the solution is obtained by expanding the diverging series; while when the inverse Laplace problem is encountered, it is more difficult to treat the more seriously ill-posed behaviors because the incomplete boundary data, and its solution, if exists, does not depend on the given boundary data continuously. Even many researchers have proposed lots of methods to overcome the ill-posed problem; however, an effective numerical scheme to tackle the problem is still not available. It is interesting to note that the characteristic length concept is introduced into the conventional Trefftz method and thus, it leads to a better numerical accuracy and stability. Besides, this method can effectively deal with the multiply-connected domain problems with the combination of moving Trefftz method even when the domain boundary is arbitrary. More noteworthy is that this proposed approach can handle the inverse problems even under disturbed boundary data. Several numerical examples are provided for validating the present approach.
KW  - Inverse Laplace problem
KW  -  modified Trefftz method
KW  -  moving Trefftz method
KW  -  ill-posed problem
KW  -  collocation method
KW  -  characteristic length
KW  -  multiply-connected domain

DO  - 10.3970/icces.2009.011.085