Analytical modelling of ship collision based on full-scale experiments

This paper presents a theoretical model allowing us to predict the consequences of ship–ship collision where large forces arise due to the sloshing in ship ballast tanks. The model considers the inertia forces of the moving bodies, the effects of the surrounding water, the elastic bending of the hull girder of the struck ship, the elasticity of the deformed ship structures and the sloshing effects in partially filled ballast tanks. The study focuses on external dynamics. Internal mechanics, presenting the collision force as a function of penetration, was obtained from experiments. The model was validated with two full-scale collision experiments, one with a significant sloshing effect and the other without it. The comparison of the calculations and the measurements revealed that the model predictions were in good agreement, as the errors at the maximum value of penetration were less than 10%.     

有压水头的排水在施工中的应用

施工排水是水利工程施工经常遇到的,本文主要论述特定情况下有压水头的施工排水的解决方法。     

三维电阻率层析成像技术研究

电阻率层析成像技术兼顾了电剖面法横向分辨率高和电测深法纵向分辨率高的优点,因而倍受工程界的重视,目前已初步实现了2维、6维数值计算和实际资料处理,而3维模型的应用研究尚处于探索阶段,属于国内外的前沿研究课题.     

Computational and experimental study on local ship loads in short and steep waves

Currently, little information exists on the validity of interface-capturing methods in predicting local ship wave loads in short and steep waves. This study compares computational and experimental results in such a case (kA = 0.24, L _wave /L _ship = 0.16). The results allow the variation of wave loading between ten locations in the bow area of the ship to be observed. The computations were performed with an unstructured RANS solver that models free-surface flows with a volume-of-fluid method. In the model tests, the wave loads were measured with pressure sensors. The analysis of the results focuses on the wave conditions and on the pressure histories of the local wave loads. The computational and experimental results are in good qualitative agreement and encourage the further use of the computational results.