Abstract
Effective boundary element methods to analyze corrosion problems for complicated structures were presented. The methods can be classified into two groups. The first one makes use of the characteristics of the structure to be analyzed, i.e. (1) thousands of same size tubes in an heat exchanger, for example, are treated by introducing a concept ‘macroscopic polarization curve’, (2) slender parts in a structure such as an off-shore structure and a bridge girder are analyzed by a kind of ‘zooming method’, (3) a non-axisymmetric potential distribution in an axisymmetric structure such as a pipeline and a seawater pump affected with outside structures is calculated by ‘Fourier series method’, and (4) target sub-region to be analyzed in detail, e.g. interior of guide casing of seawater pump, is analyzed by treating accompanying sub-regions as ‘equivalent boundary conditions’. The second one is an application of the Fast Multipole boundary element method (FMBEM), and can be used for an arbitrary structure. The method is also useful for optimum design of cathodic protection.
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