The gas-solids flow in a bubbling bed was simulated by the combined approach of computational fluid dynamics (CFD) and Discrete Element Method (DEM). The influence of granular collision parameters of particle elasticity coefficient and restitution coefficient on flow field intermittency was investigated. The continuous wavelet transform analysis was used to obtain the coherent structure behavior influenced by particle elasticity coefficient and restitution coefficient. Particle elasticity coefficient and restitution coefficient had some effect on fluctuating energy of particle velocity

mean bed height

flatness factor

and flow field intermittency. With increasing particle elasticity coefficient

the energy in high frequency domain

flatness factor and flow field intermittency decreased first and then increased

while mean bed height increased first and then decreased. The larger the restitution coefficient

the lower the energy in high frequency domain and flatness factor

and the higher the mean bed height

the weaker the flow field intermittency.