Abstract Energy waste, environmental pollution, loss of human life and property can be caused once underwater gas leakage occurs. It is of great significance to establish an emergency response mechanism for underwater gas leakage and diffusion. A 3D model based on coupled Eulerian-Lagrangian approach is carried out to investigate the underwater release characteristics and diffusion law of gas leakage. The model is validated by the experimental data from literature and the results are accord with the experimental values. Influencing factors such as marine environment, leaking rate, current speed, and water depth are analyzed by numerical simulation. The calculation results indicate that ocean condition mainly affects underwater gas migration behaviors and gas plume consumes the longest rise time under wave and current. Water depth, current speed and leaking rate significantly influence the underwater gas migration but have limited effect on gas diffusion in atmosphere. The investigation will give some advice for emergency response formulation.

中文翻译：

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基于耦合欧拉-拉格朗日CFD模型的水下气体泄漏扩散行为研究

摘要 水下气体泄漏一旦发生，就会造成能源浪费、环境污染、人员生命财产损失。建立水下气体泄漏扩散应急机制具有重要意义。建立了基于耦合欧拉-拉格朗日方法的3D模型，研究了气体泄漏的水下释放特性和扩散规律。该模型通过文献中的实验数据进行了验证，结果与实验值一致。通过数值模拟分析了海洋环境、泄漏率、流速、水深等影响因素。计算结果表明，海洋条件主要影响水下气体运移行为，气羽在波浪和水流作用下消耗的上升时间最长。水深，水流速度和泄漏率显着影响水下气体迁移，但对气体在大气中的扩散影响有限。调查将对应急响应的制定提出一些建议。