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

评价钢桥的腐蚀环境对制定合理的防腐和养护方案具有重要意义。附着海盐颗粒物(SSPM)是一个影响因素，特别是在沿海地区。为此，更好地了解SSPM对桥梁主梁的粘结性能。本文的目的是寻求数值方法来模拟从海面定向的盐粒的附着行为。具体地说，提出了两种尺度的方法。全球分析采用中尺度气象分析，局地分析采用拉格朗日型两相流分析。数值结果与观测结果的比较表明，数值分析可以再现机载SSPM的基本行为。

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