Unmanned equipment, such as unmanned underwater vehicles (UUVs) and surface (USVs), are widely used in marine science for observation, rescue, military purposes, etc. However, current not applicable complex cross-domain scenarios, because they can only perform well either navigation or diving. This paper deals with the design fabrication of a vehicle (CDV) four hydrofoils that both navigate at ...

Abstract This paper presents the Global Sensitivity Analysis of coefficients standard k- ε turbulence model used in RANS (Reynolds Averaged Navier-Stokes) simulations aimed to predict flow around a bi-dimensional hydrofoil operating at non-cavitating and cavitating regimes. The sensitivity analysis is treated by Sobol Decomposition, where Indices are computed through Polynomial Chaos Expansion ...

A two-dimensional nonlinear inverse fluid-structure interaction problem for a curvilinear elastic hydrofoil is considered. A cavity formed behind the foil is modeled according to the single-spiral-vortex model by Tulin. The fluid-structure problem is decoupled by the method of successive approximations. For the cavitation problem, the foil is modeled as a polygon. The method of conformal mappin...

A two-dimensional nonlinear inverse fluid-structure interaction problem for a curvilinear elastic hydrofoil is considered. A cavity formed behind the foil is modeled according to the single-spiral-vortex model by Tulin. The fluid-structure problem is decoupled by the method of successive approximations. For the cavitation problem, the foil is modeled as a polygon. The method of conformal mappin...

IN recent years a number of papers treating linearized free-streamline problems have appeared subsequent to Tulin's introductory paper on this subject [1] .1 Among these may be mentioned Wu's extension of Tulin's method for supercavitating hydrofoils with arbitrary shape and cavitation number [2], hydrofoils with cavitation only near the leading edge. [3], supercavitating hydrofoils in cascade ...

Abstract A passive cavitation suppression structure with flow barriers on its surface was proposed for a typical hydrofoil (NACA66 MOD). Based the homogeneous equilibrium model and Zwart-Gerber-Belamri model, characteristics around before after at operating condition are simulation investigated. Results show that provide capable of regulating controlling field, suppressing 47.1 percent flow. By...