In this study, the boundary element method is formulated to evaluate hydrodynamic characteristics of bodies including free surface effect. The method is based on two equations, the perturbation potential boundary integral and the pressure Kutta condition, which are solved simultaneously. The method uses isoparametric elements for both quantity and geometric on the boundary. The method is first ...

Experimental studies of the influence fluid–structure interaction on cloud cavitation about a stiff stainless steel (SS) and flexible composite (CF) hydrofoil have been presented in Parts I (Smith et al. , J. Fluid Mech. vol. 896, 2020 p. A1) II 897, b A28). This work further analyses data complements measurements with reduced-order model predictions to explain complex response. A two degrees-o...

This report presents an evaluation of the steady-state capability of the turbulence models available in the commercial CFD code FLUENT 6.0, for their application to the simulation of hydrofoil turbulent boundary layer separation at high-Reynolds numbers. Four widely applied two-equation RANS turbulence models were qualitatively and quantitatively assessed through comparison with high-quality ex...

This is a sea story about using a simple classroom example to save a great deal of money, as well as to convince beginning Postgraduate Naval School operations research students—experienced, skeptical military officers—that mathematical analysis can yield immediate results. The application is planning a ship’s transit from one point to another in a fixed amount of time, given that the ship can ...

The present paper contains the test results of a planing catamaran model. The aim of the tests was to study the effect of hydrofoil in these types of crafts. First, experiments were carried out on the bare body (i.e. without hydrofoils) to obtain non-dimensional hydrodynamic resistance coefficient versus speed. Then, the model with hydrofoils, by various locations and attack angles were subject...

The influence of a bulb runner blade hydrofoil shape on flow characteristics around the was studied. Experimental work performed turbine measuring station and single in cavitating tunnel. In cavitation tunnel, visualization hydrofoil’s suction side. Cavitation structures were observed for several numbers. less intense modified than original hydrofoil, delaying onset by tenths number. results tu...

Wakes of towed and self-propelled bodies moving in stably stratified flows are of relevance to environmental and ocean engineering applications. To date, the majority of studies focused on the wakes of spheres and cylinders in stratified flows. Stable stratification modulates the wake dynamics, leading to a significantly different flow compared to non-stratified wakes. The wakes of spheres and ...

Hydrofoil assistance on a catamaran model was tried twenty years ago and an unexpected resistance improvement of 40% initiated the creation of a research project to investigate the effect. Today the research project is still active inspite of designs and model tests resulting in the construction of over 200 Hysucats. Theoretical efforts to determine the hydrodynamics of the Hysucat principle re...

The kinematics model based on the Slender-Body theory is proposed from the bionic movement of real fish. The Panel method is applied to the hydrodynamic performance analysis innovatively, with the Gauss-Seidel method to solve the Navier-Stokes equations additionally, to evaluate the flexible deformation of fish in swimming accurately when satisfying the boundary conditions. A physical prototype...