The CFD-DEM model was developed to simulate solid exchange behavior between two half beds in a bench-scale two-dimensional dual-leg fluidized bed(DL-FB).Power spectrum density(PSD) analysis was applied to obtain the dominant frequency(F) of the simulated differential particle number(△P_(LR)) between the two half beds.Effects of fluidization velocity(u) and bed material inventory(H) on the solid exchange behavior were studied using the CFD-DEM model.Not only snapshots of the simulated particle flow patterns using the OpenCL code but also the dominant frequency of △P_(lr) was similar to the experimental results.The simulation results show that higher fluidization velocity assists the exchange of more particles between the two half beds,but the dispersion of clusters on the bed surface into single particles decreases the cluster exchange frequency.A greater bed material inventory results in more intense cluster exchange.The cluster exchange frequency decreases with an increase of the bed material inventory. The CFD-DEM model was developed to simulate a solid exchange behavior between two half beds in a bench-scale two-dimensional dual-leg fluidized bed (DL-FB) .Power spectrum density (PSD) analysis was applied to obtain the dominant frequency F) of the simulated differential particle number (ΔP_ (LR)) between the two half beds. Effects of fluidization velocity (u) and bed material inventory (H) on the solid exchange behavior were studied using the CFD-DEM model. only snapshots of the simulated particle flow patterns using the OpenCL code but also the dominant frequency of ΔP_ (lr) was similar to the experimental results. The simulation results show that higher fluidization velocity of the exchange of more particles between the two half beds, but the dispersion of clusters on the bed surface into single particles decreases the cluster exchange frequency. A greater bed material inventory results in more intense cluster exchange. The cluster exchange frequency decreases with an increase of the bed material inventory.