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The two-phase flow past a square is a ubiquitous phenomenon widely encountered in industries and engineering,where the interaction of disparate phases coupled with the influence of the solid is rather complicated.In this context,the flow characteristics and the vortex field are investigated to reveal the mechanisms of the two-phase drag and the vortex variation.The lattice Boltzmann method (LBM) is utilized to study the multi-component two-phase flow.The computation implemented on the GPU is remarkably accelerated thanks to the natural parallelism of the LBM.The process of the two-phase flow past a square is thoroughly examined.The drag and lift forces,including the total force and the components caused by the dispersed phase and the continuous phase,respectively,are obtained,and their variation mechanisms are explained.Meanwhile,the vortex-identification approaches based on the Liutex as well as the traditional methods are compared.The relationship between the bubble breakup and coalescence processes and the extremums of different vortex identification variables is analyzed.