REASONABLE SCOUR PREVENTION DESIGN USING 3-D FLUID SIMULATION ABOUT SUBMERGED MULTI-PORT DIFFUSER OF POWER PLANT

Abstract

 In this paper, scour prevention region was designed reasonably using numerical simulations about submerged multi-port diffuser of Fukushima Natural Gas Power Plant. By numerical simulations using energy balance equation model, it was shown that the wave propagated mainly from northeast or east-northeast direction and its wave height was about 3.9m at the point of the submerged multi-port diffuser. Numerical simulations with 3D-VOF method were also conducted, and it was found that the flow field was disturbed by the shape of multi-port diffuser and it was shown that especially the flow induced by discharged water from the nozzles increased velocity around seabed. Finally, the area with the flow velocity of 1.0 m/s or more, where bedload and suspended load coexist, was determined as the scour prevention region.