Abstract: Changes in flow branch and regime and upwelling were investigated in frame type(bell type of six columnar plane 2 m×4 m)and caisson(hollow opening square 3 m×3 m)artificial reefs to analyze the flow characteristics around the artificial reefs by Computational Fluid Dynamics (CFD) method.The results showed that the vortex was found at the bottom of the frame type reef, and at the bottom and the middle part in the caisson reef, larger in the caisson reef than that in the frame type reef.There was uniform spatial distribution of pressure in the frame type back vortex region, and change in 0.5 times pressure was observed in reef wide in the left and right sides of the caisson type reef, with uneven pressure spatial distribution in back vortex area of the caisson type.The velocity was found to be increased at the 0.5-1.0 times height of upwelling area in the caisson reef.The comprehensive comparison indicates that the frame type reef has good flow field effect, and high efficiency in fish collecting under the same working conditions.
2019, Vol. 34 
