Mathematical Simulation of Unsteady Ventilated Supercavitation

Considering the complex factors concerned in ventilated supercavitation, such as time-variable characteristic, difficult realization and high cost, mathematical simulation of unsteady ventilated supercavitation is studied. Based on the principle of independence of cavity sections expansion(Logvinovich′s principle), an model of unsteady ventilated supercavitation is established, and corresponding simulation method is presented. The factors influencing supercavita-tion shape are simulated dynamically. Consequently, the supercavitation′s shape change regularity and its relative posi-tion to underwater vehicle surface are obtained at different ventilation parameters and moving parameters, and the re-quirements of cavity close position for satisfying vehicle high-speed steady motion are proposed. This study may offer a reference for designing ventilating system and running capability of an underwater high-speed vehicle.