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 ...

Using multiphase computational simulations based on the Navier-Stokes equations, we examine the internal gaseous flows of artificially ventilated supercavities. These simulations indicate that air shear layers that develop on the cavity-wall (the air-liquid interface surrounding the cavity) are an important mechanism of air entrainment. This corroborates previous theory developed for toroidal c...

Supercavitation technology can greatly improve the speed of underwater vehicles by reducing drag. However, time-delay characteristic a supercavitating vehicle presents control challenge. In this paper, linear parameter-varying (LPV) model for is established analysing characteristics planing force. Moreover, considering that cavitation radius easily perturbed external disturbances, LPV delay dep...

This paper presents a calculation method for the 3-D unsteady cavitating hydrofoil problem. The method is based on a simple surface panel method “SQCM” which satisfies easily the Kutta condition even in the unsteady problem. This method is applied to the Wagner problem, heaving hydrofoil and the hydrofoil in sinusoidal gust. We show some calculated results for partially cavitating and supercavi...

Alyanak, Edward J. Ph.D., Department of Mechanical and Materials Engineering, Wright State University, 2006. Efficient Reliability Based Design and Optimization of Structural Systems Using Evidence Theory. A computationally efficient methodology was developed to make utilizing evidence theory in reliable optimization feasible. Evidence theory was adopted because of its ability to handle both ep...

Rotational Supercavitating Evaporator (RSCE) has been proposed as a new technology for seawater desalination. However, it lacks systematic researches on the blade shape of RSCE. In this paper, numerical simulations were conducted on the supercavities formed behind two-dimensional (2D) wedge-shaped cavitators of the RSCE. The cavitating flows around the 2D wedge-shaped cavitators with several ce...

To improve the understanding of the unsteady behavior of supercavitating flows, the author used a three-dimensional Navier-Stokes code (CFDRC, 2000) to model the two-phase flow field around a hemisphere cylinder. The governing equations are discretized on a structured grid using an upwind difference scheme. For different body shapes and cavitation numbers, the cavity shape was determined over t...