Development of a high-resolution local scale ocean simulation model based on LBM and GPGPU

结合GPU计算技术的晶格玻尔兹曼方法（lattice Boltzmann method， LBM）是一种用于海洋CCS环境评估的局部尺度海洋模拟模型。对高雷诺数流场的LBM代码进行了大涡模拟（LES）。为了提高高雷诺数和高Peclet数问题CO2扩散计算的精度，提出了一种有限体积法（LBM/FVM）混合方法。采用GPU并行计算技术加快仿真速度。利用所建立的基于lbm的数值模型，对CO2湖的CO2溶解、扩散和对流以及海底储存库泄漏CO2液滴的上升行为进行了两个CCS数值模拟，并获得了令人满意的结果。

As a novel local scale ocean simulation model for environment assessment of marine CCS, a lattice Boltzmann method (LBM) combined with GPU computing technology has been developed. A large eddy simulation (LES) model has been implemented to the LBM code for high Reynolds number flows. To increase the accuracy of CO2 diffusion computation on high Reynolds and high Peclet number problems, a hybrid LBM/FVM (finite volume method) method has been developed. The GPU parallel computing technique has been applied to accelerate the simulation. Using the developed LBM-based numerical model, two numerical simulations on CCS, the CO2 dissolution, diffusion, and convection from a CO2 lake, and the ascent behavior of a CO2 droplet leaked from a sub-seabed storage site, have been carried out and promising results have been obtained.