|Table of Contents|

Citation:
　M. Silveira,S. Wang,C. Guedes Soares.Multi-Phase CFD Simulation of Lifeboat Free-Fall Launch Dynamics with Varying Pitch Angles[J].Journal of Marine Science and Application,2026,(3):657-668.[doi:10.1007/s11804-026-00813-w]
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Multi-Phase CFD Simulation of Lifeboat Free-Fall Launch Dynamics with Varying Pitch Angles

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Title:
Multi-Phase CFD Simulation of Lifeboat Free-Fall Launch Dynamics with Varying Pitch Angles
Author(s):
M. Silveira;  S. Wang;  C. Guedes Soares
Affilations:
Author(s):
M. Silveira;  S. Wang;  C. Guedes Soares
Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Lisbon, 1600-214, Portugal
Keywords:
CFD simulation; Water entry; Free-fall launch; Lifeboat; Overset mesh
分类号:
-
DOI:
10.1007/s11804-026-00813-w
Abstract:
The objective of this study is to simulate the free-fall launch of a lifeboat and to analyse its trajectory, pitch angle, velocity, acceleration, and pressure dynamics using Open Field Operation and Manipulation (OpenFOAM). Utilising the overset grid technique, which is well-suited for handling the expected large motions, the study employs multi-phase simulations based on the volume of fluid method. A series of 21 simulations is conducted, varying initial pitch angles and three different drop heights to thoroughly examine the lifeboat’s behaviour under various conditions. The analysis of pressure across multiple points along the same transversal and longitudinal planes reveals two significant pressure peaks: one at the bow during water entry and another at the stern, occurring after a secondary water entry triggered by turn-back spins due to restoring moments. Pressure contours indicate that the keel experiences the highest loads, highlighting it as a critical area of concern. Additionally, the kinematics of each scenario is analysed to determine which initial pitch angle would allow the lifeboat to distance itself most effectively from potential hazards without additional impulse. This aspect of the study aims to identify optimal launch conditions that enhance safety and minimise risk during emergency deployments.

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Memo

Memo:
Received date:2025-7-10。<br>Foundation item:This work was performed within the Strategic Research Plan of the Centre for Marine Technology and Ocean Engineering (CENTEC), which is financed by Portuguese Foundation for Science and Technology (Funda&#231;&#227;o para a Ci&#234;ncia e Tecnologia-FCT) under contract UID-00134-2025. Open access funding provided by FCT∣FCCN (b-on).<br>Corresponding author:S. Wang,E-mail:shan.wang@centec.tecnico.ulisboa.pt
Last Update: 2026-06-25