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Comparison of PROCOR computations withPhysical Scale Modeling measurements

机译：PROCOR计算与物理比例模型测量的比较

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Validation with experimental data of electrochemical potentials on a ship hull orelectric fields in the sea obtained by computation is very difficult even impossible.Electrochemical data of real materials depend on a multitude of parameters (surface state,oxygenation rate, marine pollution…) which are partially unknown. Material data used fornumerical models are generally given from experiments carried out in laboratory on testpieces with environmental conditions that may much differ from real conditions.Validation results proposed in the paper are related to a ship mock-up measured in the NavalResearch Laboratory (NRL) Physical Scale Modeling (PSM) facility in Key West (USA). Thecathodic protection system is reproduced to scale on the mock-up with cathodic areasprecisely localised on the hull.The paper presents first the mock-up instrumentation, the measurement procedure, thenumerical model of the ship made with the software PROCOR. Then, the electric fieldscomputed in water and the potentials computed on the hull are compared to electric fields andhull potentials measured under and on the mock up.The software PROCOR is developed by CETIM with 3 other partners (IFREMER, TOTAL,DGA) to design cathodic protection systems against corrosion of underwater structures. Thisnumerical tool, based on a Boundary Element Method, computes electrochemical potentialsand current densities on the hull and in the sea. By direct derivation of the electrochemicalpotential, PROCOR computes the Underwater Electric Potential field (UEP), the DC electricfield related to corrosion.Various damage scenarios are considered : hull perfectly painted, 1%, 3%, 5%, 9% and 13%of paint defect on the hull.
机译：用计算获得的船上电化学势或海洋电场的实验数据进行验证是非常困难的，甚至是不可能的。真实材料的电化学数据取决于多种参数（表面状态，氧化速率，海洋污染……）未知。用于数值模型的材料数据通常来自在实验室中对环境条件可能与实际条件有很大差异的试件进行的实验。本文提出的验证结果与在海军研究实验室（NRL）实测的船舶模型有关。美国基韦斯特的比例模型（PSM）设施。阴极保护系统可按比例复制到模型上，并在船体上精确定位阴极区域。本文首先介绍了使用PROCOR软件制成的船的模型仪器，测量程序和数值模型。然后，将水中计算出的电场和在船体上计算出的电势与在模型上和模型下测得的电场和船体电势进行比较。CETIM与其他3个合作伙伴（IFREMER，TOTAL，DGA）共同开发了PROCOR软件来设计阴极防止水下结构腐蚀的保护系统。该数字工具基于边界元方法，可以计算船体和海洋中的电化学势和电流密度。通过直接推导电化学势，PROCOR可以计算出与腐蚀有关的水下电势场（UEP），直流电场，并考虑了各种损坏情况：船体完美涂漆，分别占漆膜的1％，3％，5％，9％和13％船体上的油漆缺陷。

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