Three Gorges Ship Lift The Ship Out Of The Added Mass Calculation Of Ship Chamber

In the paper we studied the added mass of the ship when entering and leaving the chamber of the ship-lifter of Three Gorges project, based on a 3D model. This is a problem of calculating the added mass of a body moving in a restricted field. We first calculate the velocity potential between two adjacent time-steps and obtain the inertia force and added mass through integration.To verify our computer code, we compute the added mass of a cylinder in the infinite domain and the semi-infinite domain as well as the inner one of two concentric cylinders, respectively. Computational results match the analytical solutions quite well and we obtain certain valuable conclusions about added mass in different situations. The results show that the added mass coefficient will increase with (1) the decrease of the distance between ship and chamber sides, (2) the decrease of the water depth inside the chamber, (3) the decrease of the distance between the ship and the frontier of the chamber, (4) the decrease of the depth of guiding channel, (5) the decrease of the remaining part of the ship in the guiding channel, (6) the decrease of the distance between the ship and the barrier in front of the ship.The added mass of the ship of Three Gorges project is also computed and the curves of the added mass coefficient via the different water domain are obtained. The results should be useful in practice and computer code could be used in relevant areas.