Traditional rigid impeller transfers energy by shearing action

while flexible-rigid impeller can intensify energy transfer by multiple-body movement. Based on the interaction between impeller and fluid

the equivalent stress and total deformation are computationally simulated for flexible-rigid and rigid impellers. Macroscopic flow structure is obtained by two-way fluid-structure interaction technique with simulation platform ANSYS Workbench

and the mixing effect in two stirred systems are discussed with measured mixing time and calculated impeller power dissipation. Compared with rigid impeller

the mixing time of flexible-rigid impeller system is decreased by 32%

its power dissipation is declined by 7%

its total deformation of blade tip is 105 times larger

and its equivalent stress of blade tip is 83% greater

so that flexible-rigid impeller exerts greater force to fluid with the fluid-structure interaction

which contributes to energy transmission

liquid flow and mixing intensification.