海上溢油漂移扩散的数值模拟

该文基于三维自由水面垂向分层动网格的Euler-Lagrangian模式,采用VC方式(Vertex-Centered)的非结构化有限体积方法离散三维浅水方程,模拟渤海的潮汐水流运动过程。以此为水动力背景场,采用油、水分离的Lagrangian粒子追踪模型,对渤海海域发生的溢油漂移扩散问题进行模拟。其油品的蒸发、乳化和溶解等风化作用以引入综合衰减系数的方式考虑。模型对油膜的漂移路径、厚度和面积进行了实时模拟和预测,用多个测站的同步连续实测值对水动力模式进行了参数率定与模型验证,油膜输运扩散的计算结果也与相关报告数据进行了对比,均吻合良好,说明模型具有较高的可靠性与重现性。

Numerical simulation of oil spill drift-diffusion in the sea

Based on the Euler-Lagrangian model of vertical layered dynamic grid with three-dimensional free surface,unstructured finite volume method with the VC (Vertex-Centered) style is used to simulate the flow process of tidal current in the Bohai.Using the three-dimensional hydrodynamic model as the background field,the Lagrangian particle tracking model of oil and water separation is used to simulate the oil spill in the Bohai.The volume of oil is estimated by correlation data.The weathering of evaporation,emulsification,dissolution and other factors of the oil are considered in the comprehensive attenuation coefficient.The parameters of the hydrodynamic model are determined by using the synchronous continuous measurement of multiple stations.The drift path,thickness and area of oil film are simulated and predicted by using this model.The calculation results of oil film transport and diffusion are also compared with the results of the relevant reports.The results show that the model has good accuracy,reproducibility and practicality.