Compared　with　the　traditional　Eulerian-Eulerian　two-fluid　modeling　(TFM)　approach,　dense　discrete　phase　model　(DDPM)　is　potentially　promising　for　industrial-scale　applications　of　fluidized　bed　reactors,　due　to　its　capability　of　tracking　the　trajectories　of　particle　parcels　and　resolving　the　particle　size　distributions　(PSD).　However,　DDPM　is　yet　at　its　early　stage　of　mature　implementation.　Hence,　verification　and　validation　of　the　DDPM　approach　is　still　required　for　future　applications　of　different　gas-solid　fluidization　regimes.　In　the　present　work,　verification　and　validation　of　the　DDPM　is　systematically　investigated　for　the　first　time,　with　regards　to　bubbling,　turbulent　and　circulating　fluidized　beds.　The　sensitivity　of　the　drag　force,　a　key　modeling　parameter　in　gas-solid　fluidized　bed　reactors　is　investigated　with　two　different　drag　models　i.e.,　Gidaspow　and　EMMS/bubbling.　Numerical　results　of　bubbling,　turbulent　and　circulating　fluidization　regimes　are　presented　in　terms　of　discrete　particle　distributions,　axial　and　radial　solid　concentrations　and　radial　solid　velocity　profiles　distributions.　The　results　indicate　that　the　sub-grid　correction　based　on　the　EMMS　approach　is　essential　for　the　DDPM　to　correctly　account　for　the　effects　of　dissipative　structures　in　all　three　fluidization　regimes.　While,　the　DDPM　with　the　conventional　Gidaspow　drag　failed　to　do　so.　Further,　validations　of　the　numerical　results　with　the　experimental　data　also　prove　that　the　DDPM　approach　with　EMMS/bubbling　drag　model　can　resolve　the　time-averaged　axial　and　radial　solid　concentrations　and　radial　solid　velocity　profiles　better　than　the　conventional　Gidaspow　drag　model.　©　2020