Using the Gaussian function to simulate constant potential anodes in multiobjective optimization of cathodic protection systems

Santos, Wilian Jeronimo dos; Santiago, J.A.F.; Telles, J. C. F.

doi:10.1016/j.enganabound.2016.08.014

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…This can be done by connecting the protected object with additional electrode(s) placed in same electrolyte (ground or water), which equilibrium potential is more negative than equilibrium potential of the protected object [2]. After installation of the cathodic protection system, electric potential value on the entire surface of protected structure must be lower than minimum protection potential value defined by standards [3]. Also, current density distribution on the surface of protected structure should be uniform as possible [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Model for Simulation of the Cathodic Protection System with Dynamic Nonlinear Polarization Characteristics

Mujezinović

Turkovic

Muharemović

et al. 2020

Wseas Transactions on Mathematics

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Cathodic protection is defined as a method for slowing down or complete elimination of corrosion processes on underground or underwater, insulated or uninsulated metal structures. Protection by cathodic protection system is achieved by polarizing protected object to more negative value, with respect to its equilibrium potential. Design of the cathodic protection system implies determination of the electric potential and current density on the electrode surfaces after installation of the cathodic protection system. Most efficient way for determination of the electric potential and current density in the cathodic protection system is by applying numerical techniques. When modeling cathodic protection systems by numerical techniques, electrochemical reactions that occur on electrode surfaces are taken into account by polarization characteristics. Because of nature of the electrochemical reactions, polarization characteristics are nonlinear and under certain conditions can be time – varying (dynamic nonlinear polarization characteristics). This paper deals with numerical modeling of the cathodic protection system with dynamic nonlinear polarization characteristics. Numerical model presented in this paper is divided in the two parts. First part, which is based on the direct boundary element method, is used for the calculation of the distribution of electric potential and current density on the electrode surfaces in the spatial domain. Second part of the model is based on the finite difference time domain method and is used for the calculation of the electric potential and current density change over time. The use of presented numerical model is demonstrated on two simple geometrically examples.

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Section: Introductionmentioning

confidence: 99%

Numerical Model for Simulation of the Cathodic Protection System with Dynamic Nonlinear Polarization Characteristics

Mujezinović

Turkovic

Muharemović

et al. 2020

Wseas Transactions on Mathematics

View full text Add to dashboard Cite

show abstract

“…The boundary element method is a method based on the weighted residual method, which converts the boundary value problem into a boundary integral equation problem and then uses the finite element discrete technique to construct linear equations [12]. BEM was applied to anticorrosion research of offshore engineering structures in the early 1980s [13,14]. Nowadays, it has been widely used in the simulation of cathodic protection system optimization of various marine structural parts such as oil rigs, submarine pipelines and ships [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Simulating Underwater Electric Field Signal of Ship Using the Boundary Element Method

Wang¹,

Xu²,

Zhang³

2018

PIER M

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Seawater conductivity is an important factor that affects the corrosion electric field of ship. A three-dimensional boundary element method (3D-BEM) combined with nonlinear polarization curve was employed to investigate the influence of seawater conductivity on the corrosion electrostatic field. Numerical simulation results show that the electric field distribution is only slightly influenced by the conductivity. However, the intensity decreases with the increases of conductivity. The simulation results of the BEM model were compared with the results of the equivalent electric dipole model, and the results obtained by the two methods had high similarity, which demonstrated that the BEM model was effective. The former is a more convenient and concise modeling method that can better reflect the distribution characteristics of ship's corrosion electric field than the electric dipole model.

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“…Several different applications of BEM to study CP systems have been reported in the literature, including reference to practical analyses performed by offshore oil companies (BEASY, 2000;Brasil, Telles, & Miranda, 1991;Kim, Kim, Choi, Lim, & Kim, 2017;Santiago & Telles, 1997;Telles, Mansur, Wrobel, & Marinho, 1990). Recently, the method of fundamental solution (MFS) has also been used successfully to CP problems (Santos, Santiago, & Telles, 2012, 2014, 2016.…”

Section: Introductionmentioning

confidence: 99%

A new solution technique for cathodic protection systems with homogeneous region by the boundary element method

Santos

Brasil

Santiago

et al. 2018

TECM

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The purpose of this work is to efficiently evaluate the design of cathodic protection (CP) systems of tank bottoms using concentric ring or linear anodes. As customary in current CP systems, the outer surface of the tank bottom is usually in electrical contact with a slender homogeneous layer of conductive concrete (or something similar) which in turn is in direct contact with the homogeneous deep soil region. The boundary element method (BEM) together with a subregion technique has been widely adopted to analyse such CP systems where the domain consists of two (or even more) homogeneous zones. However, the numerical solution of the final matrix system of equations can be quite time-consuming, especially if the slender intermediate layer is to be discretised, requiring a considerable number of elements, due to its somewhat reduced thickness. To overcome this problem, the present work proposes a new methodology in which the slender subregion is indirectly introduced, as a theoretically created polarisation curve, acting as a new boundary condition at the boundary of the soil domain (original common interface). Numerical simulations have been carried out using BEM implementations and results are discussed, including CP studies of practical axisymmetric and three-dimensional engineering problems.

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Using the Gaussian function to simulate constant potential anodes in multiobjective optimization of cathodic protection systems

Cited by 7 publications

References 24 publications

Numerical Model for Simulation of the Cathodic Protection System with Dynamic Nonlinear Polarization Characteristics

Numerical Model for Simulation of the Cathodic Protection System with Dynamic Nonlinear Polarization Characteristics

Simulating Underwater Electric Field Signal of Ship Using the Boundary Element Method

A new solution technique for cathodic protection systems with homogeneous region by the boundary element method

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