Assessment for hydrodynamic masses of HANARO flow tubes

The effect of hydrodynamic masses is investigated in dynamic characteristics and seismic response analyses of the submerged HANARO hexagonal flow tubes. Consistent hydrodynamic masses of the surrounding water are calculated by the finite element method, in which arbitrary cross-sections of submerged structures and boundary conditions of the surrounding fluid can be considered. Then, modal analyses and response spectrum analyses are performed using hydrodynamic masses obtained from infinite and finite ideal fluid assumptions and are verified by comparing the results measured from modal tests. Practical criteria based on parametric studies are proposed as the lumped hydrodynamic masses for HANARO flow tubes