Study of fluid impact on Mark III type flat panel in wet drop and the quantitative assessment method

The Mark-III type flat panel has complex geometrical features, which make it difficult to accurately assess the global fluid impact on the structure. In this paper, the wet drop of the Mark-III type flat panel is numerically analyzed using the CFD method to study the distribution characteristics of peak pressure and its mechanisms. The distribution of peak pressure between the flat region and the corrugation region of the structure is compared. The results show the effect of the incident angle on the impact pressure. Furthermore, this paper presents a method for quantifying the global fluid impact based on the weighted average over multiple regions. First, the structure is divided into different regions according to its geometrical features and the impact pressure in each element of the regions are calculated. Second, the peak pressure and the area of each element are analyzed to obtain the weighting factors of each region. Finally, the quantified fluid impact is defined as the sum of the products of peak pressure, area ratio and weighting factor. After the initial verification of this method, it is used to analyze the effect of different independent variables on the global fluid impact in the wet drop.