不规则波对平板冲击作用数值模拟研究

文章采用数值模拟方法,建立了基于FLUENT软件的二维不规则波浪数值模型,探讨了波浪对水平板结构的作用机理.模型中采用RANS方程和标准k-ε方程,采用VOF方法重建自由液面.通过数值模拟复演了波浪冲击水平板结构的过程,将数值模拟结果与实验数据进行比较,验证了模型的可靠性.经过计算和分析,研究了波浪冲击平板过程中的冲击压力和流场特性,得到了冲击压力和流场的分布规律.分析了波陡,净空及板宽等参数对冲击压力和流场的影响.最后,给出了波浪冲击压力与相应水质点垂直速度间的统计关系,并对河海大学原有冲击压力的计算公式进行了改进,提出了新的冲击压力公式.研究结果表明:冲击压力峰值与相应的水质点垂直速度的平方成正比,修正后的冲击压力公式更为合理、可行.论文工作将对准确预测冲击载荷,掌握更多的冲击机理具有重要意义.

Simulation of Irregular Wave Impact on Horizontal Plate Structures

Using numerical simulation method, two-dimensional irregular wave numerical models were established based on the software FLUENT, then the mechanism of wave impact on horizontal plate structures was explored. RANS equations and standard k-ε equations were adopted in the models. VOF method was used to reconstruct the free surface. Through the process of wave slamming on hori-zontal plate structures, the models were verified by experimental data and the wave impact process could be displayed visually. With calculations and analysis, the characteristics of impact pressure and flow field during the process of wave impact were investigated, and the distribution rules of the im-pact pressure and flow field were obtained. The parametric studies were carried out for different wave steepness, relative clearances and relative structure widths, and the influences of the three parame-ters on the impact pressure and flow field were analyzed. Finally, the statistical relationship between the wave impact pressures and corresponding vertical velocities of fluid was analyzed, and the pres-sure formulas were improved based on the original calculation formulas of Hohai University. The re-sults indicate that the peak impact pressure is proportional to the square of the corresponding verti-cal velocity and the revised formula is more reasonable and feasible. The work is significant for ac-curately predicting impact load and mastering more impact mechanism.