Abstract

The open source CFD library OpenFOAM is utilised to simulate the hydrodynamic impact process of 2D wedges. Incompressible multiphase flow solver interFoam is employed to calculate the free fall of structure from air into water using dynamic deforming mesh technique. A convergence study of dynamics as well as kinematics is carried out on successively refined meshes. Obtained results are presented and compared to experimental measurements. The computed impact loadings show reasonable mesh convergence.

Introduction

Water wave impacting on ships is an important problem in naval engineering (Chuang 1970). Under rough sea states, the ship can be impinged by large waves at the bow. This causes the ship to experience great impact forces and high frequency vibrations with relatively long duration, and the violent pressure loadings can spread over the bow flare. The flare slamming phenomenon is usually accompanied by green water impact, in which a large amount of water breaks onto the ship deck and generates large pressures there (Xu & Duan 2009). Other kinds of hydrodynamic impacts including bottom slamming and wave slap can also occur under rough sea states.

Accurate predicting the impact loadings for these harsh events is of great importance to ship industry but it remains to be a big challenge to either theoretical analysis or experimental investigation due to the inherent strong nonlinearity of the problem (Faltinsen 2000). With the fast development of computer technology and numerical analysis, computational fluid dynamics has been more frequently applied in various areas including aerospace engineering, bio-mechanics and chemistry, etc. There is also a continuous rise of the use of CFD as an important analysis and design tool in ship industry (Qian et al. 2006).

In this paper, we present a numerical investigation of the water entry of 2D wedges. The open source CFD library OpenFOAM is utilised to simulate the hydrodynamic impact process. We use the dynamic deforming mesh technique to simulate the free fall of structure from air into water. An incompressible multiphase interFoam is employed to calculate the pressure and force loadings on the structure. Convergence study is carried out on successively refined meshes. Obtained results are presented and compared to experimental measurements (Kim et al. 2014).

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