二维物体入水砰击问题的理论方法研究

入水问题的研究在水动力学和海洋工程等领域有着重要的现实意义。文章采用Wagner模型的思想,将其中的相当平板理论改为椭圆拟合,得到了不同斜升角的二维楔形体匀速入水时的湿表面无量纲压力分布和砰击力,并与其它理论方法和数值计算结果相比较。椭圆拟合方法得到的压力分布在楔形体斜升角较小时与数值计算结果吻合良好,砰击力与数值计算结果在较大斜升角的情况下仍然很接近,比其它理论方法的适用范围更广,可以作为工程上估算砰击力大小的一种新方法。

A study of theoretical method for two-dimensional water impact problems

Water impact problems have practical importance in several fields such as ship hydrodynamics and ocean engineering and received considerable attention. Wagner created the basis of the applied theory of water impact and his concepts and ideas are still in use. This paper refers to the idea of Wagner model which substitutes the entering body with a flat plate. Instead, the flat plate fitting is replaced by ellipse fit-ting. This method is used to analyze the hydrodynamic force and pressure distribution of two-dimensional wedges of different deadrise angles. The results are compared to those obtained by other theoretical and nu-merical methods. Pressure distribution shows good agreement with numerical results when the deadrise an-gle is small. The hydrodynamic force is also closed to numerical results and more accurate even when the deadrise angle is large. This method can apply to entering bodies of a large range of deadrise angles and has a good value in engineering application of estimating hydrodynamic forces during water impact.