Modelling Of Protective Potential
Distribution In A Cathodic Protection
System Using A Coupled BEM/FEM Method
Author(s)
A. Muharemović, H. Zildžo & E. Letić
Abstract
Design of any cathodic protection (CP) system requires one to determine current
density which meets predefined criteria, and to ensure as uniform a current
density distribution as possible over the structure surface. Nowadays the only
reliable way to determine current and potential distribution is employment of
numerical techniques. In this paper, the optimisation of a passive cathodic
protection system by using coupled BEM/FEM is presented. FEM is appropriate
for solving completely bounded domains, and it is used for discretization of
anodes and cathodes. BEM is applied for discretization of electrolyte, i.e. infinite
domain. In the coupled BEM/FEM the soil domain is linked to the steel domain
through the current density (boundary condition) generated by the kinetics of the
corrosion reactions at the steel surface. Verification of the obtained numerical
result is made by comparing it with measured results. Good agreement between
simulation and measurements has been found.
Keywords: cathodic protection, finite element method, boundary element
method, galerkins weighted residuals method, successive underrelaxation
method.
1 Introduction
The distribution of protection potentials in systems of cathodic protection
(electrostatic field with or without sources) is defined either by the Poisson or
Laplace equation, with the usage of corresponding boundary conditions.
Keywords
cathodic protection, finite element method, boundary elementmethod, galerkins weighted residuals method, successive underrelaxationmethod.
Related Book
Other papers in this volume
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