Taking the rigid NACA0012 airfoil as object, key structural parameters of spring–mass system that govern dynamics double-elastic-constrained flapping hydrofoil are numerically studied in this paper. A two-dimensional numerical model, based on CFD software FINE/Marine, is established to investigate influence spring stiffness coefficient, frequency ratio, and damping coefficient motion performanc...

We propose a model for planar carangiform swimming based on conservative equations for the interaction of a rigid body and an incompressible fluid. We account for the generation of thrust due to vortex shedding through controlled coupling terms. We investigate the correct form of this coupling experimentally with a robotic propulsor, comparing its observed behavior to that predicted by unsteady...

Acoustic field generated by a single vortex approaching a hydrofoil is studied. A combined vortex/RANS simulation for the near–field unsteady vorticity is developed to include effects from RANS Reynolds stresses. The far-field acoustics is calculated using a vortex sound formula with the near-field vorticity as the source. The results show that at a higher incident angle when the RANS shows a s...

Numerical study is presented in this work for turbulent cavitating flow pattern simulation on a hydrofoil, using state equation of cavitation model along with combined turbulence mixed fluid based commercial software FLUENT 6.0. This solver finite volume method. Cavitating yield irregular behavior the variation values ( . focused pressure variation, vapor fraction, lift and drag forces foil sec...