The modified lattice Boltzmann method (LBM) and discrete element method (DEM) were combined to simulate the bubble movement in bubbling bed of single port jet

based on the LBM-DEM four-direction coupling model. Fluid phase used the classical D2Q9 model of LBM

particle phase was solved by the discrete element soft sphere model

particle drag force was solved by adopting the Gidaspow model

and fluid-solid coupling was based on the Newton's third law. The above model was solved by the Fortran language procedure. The bubble evolution process in bubbling bed was simulated and compared with the related experiments

which effectively verifies the accuracy of the present model. Meanwhile

the particle velocity

particle volume fraction and energy distribution in the bed were analyzed. The results show that the distribution of particle time-averaged velocity can show the motion strength of particles

and reflect the bubbles' movement process. The voidage in the bed and the distribution of particle volume fraction have the high consistency in predicting the bed expansion height. The initial accumulation effect makes that potential energy of particles is always larger than kinetic energy of them in the bed. In addition

potential energy increases

but kinetic energy gradually decreases with particle density.