水下溢油数值模拟研究

基于Lagrange积分法和Lagrange粒子追踪法建立了一个水下溢油数值模型。该溢油模型由两个子模型组成:羽流动力模型和对流扩散模型,其中羽流动力模型用以模拟溢油的喷发阶段和浮力羽流阶段;对流扩散模型用以模拟溢油的对流扩散阶段。通过数值实验,结合实验室水槽实验和水下溢油现场实验的观测资料进行模型验证。实验结果表明,模拟结果与观测资料一致性较好,从而验证了本文溢油模型的合理性和准确性;羽流动力模型为对流扩散模型提供源,海流、海水的垂向密度结构和油滴的直径分布是影响溢油在对流扩散阶段运动和分布的主要因素。

Numerical simulation of underwater oil spill

Based on a Lagrangian integral technique and a Lagrangian particle tracking technique, a numerical model is developed to simulate the underwater oil spill. This model consists of two submodels: the plume dynamics model is used to simulate the turbulent jet stage and the buoyant plume stage while the advection diffusion model is used to simulate the advection diffusion stage. The model is verified by the numerical experiments in combination with the observations from laboratory flume experiments and field experiment. The experimental results indicate that: the model results are in good agreement with the experimental observations, verifying the rationality and accuracy of the oil spill model in this paper; the plume dynamics model provides a source for the advection diffusion model while the current, vertical profile of the sea density and oil droplet size distribution dominate the movement and the underwater distribution of the spilled oil.