Global and local approaches to numerical prediction of adhesion of airborne sea salt particles on bridge girders

对钢结构桥梁的腐蚀环境进行评估，对于制定合理的防腐蚀和养护方案具有重要意义。海盐黏附颗粒物（SSPM）是影响海盐浓度的主要因素，在沿海地区尤为明显。为此，最好了解SSPM与桥梁梁的黏附性能。本文的目的是寻求数值方法来模拟盐颗粒从海面取向的粘附行为。具体而言，提出了双尺度方法。全球和局部分析分别采用中尺度气象分析和拉格朗日型两相流分析。数值与观测结果的对比表明，数值分析能够再现机载SSPM的基本特性

It is important to estimate corrosion environment of steel bridges for a proper corrosion prevention and maintenance program. Adhered sea-salt particulate matter(SSPM) is an influential factor especially in coastal areas. To this end, it is better to know the adhesion behavior of SSPM to bridge girders. The objective of this manuscript is to pursue numerical method to simulate the adhesion behavior of salt particles oriented from sea surface. Specifically, two scale approach is proposed. Mesoscale Meteorological Analysis and Lagrangian type two phase flow analysis are used in global and local analyses respectively. The comparisons between the numerical and observed results showed that the numerical analysis can reproduce essential behaviors of airborne SSPM