The following papers have been accepted but have not been finalized (proof reading) yet.
«« Back

Numerical study of the hydrodynamic pressure field generated due to the motion of a ship at different speeds on a sea
Author(s): Amir Nasseroleslami, Ali sarreshtehdari, mahmoud salari
Keywords: Hydrodynamic pressure, Draft, Oil tanker
Ships' movement in finite water depths followed by a significant hydrodynamic pressure field around the body, which can have some problems on the seabed, sidewalls of channels, or other traveling vessels. So, the study of this phenomenon is very important in many applications. In this research, the hydrodynamic pressure field caused by the movement with 247 m long, 53 m wide and 17 m draft at different speeds of 10, 15 and 20 knots on a sea surface with depth of 80m was investigated numerically. The governing equations include the continuity equation, the momentum equation, and the K-ε turbulence model are solved numerically and the SIMPLE algorithm is used to relate between the pressure and velocity fields.An accurate Trimmer's structured mesh has been used to discrete the studied domain around the ship. For validation of the methodology, the obtained dimensionless velocity field is compared with those presented by Kim et all. As expected, the magnitude of the hydrodynamic pressure field is expected to be a function of the distance to the body of the vessel, its velocity and draft. In this study, the minimum effects of the pressure field were 10 knots (the minimum working velocity of heavy vessels) at 80 m depth with a maximum pressure of 980 Pa. The results show that at close distances to the body of the vessel, the pressure field dissipation occurs more rapidly and in the remote area of the body, the pressure field domain decreases with lower slope. The hydrodynamic pressure equation is obtained based on depth and velocity variables. The two and three-dimensional hydrodynamic pressure contours at different depths and velocities are also presented. The hydrodynamic pressure increment was also investigated in 12 and 7 m drafts and it was found that after the 3/4 height of the bulbous bow lies below the surface of the water, the draft increase has little effect on the hydrodynamic pressure field.