A Comparative Study of Supercavitation Phenomena on Different Projectiles Shapes in Transient Flow by CFD

Document Type : Original Article

Authors

1 Aeronautical Eng., Mansoura University, Egypt

2 Mechanical Power Department, Mansoura University, Egypt

3 Mechanical Power Department, Zagazig University, Zagazig, P.O. 44519, Egypt

Abstract

Body shape of high-speed underwater vehicles has a great effect on the
Supercavitation behaviour. The transient flow around either partially cavitating or
supercavitating body affects the trajectory of high-speed underwater vehicles.
Commercial code (ESI-CFD ACE+, V 2010) was used to simulate the
supercavitation around two different shapes of a projectile with their noses of
hemispherical shape and telescopic shape. Also, conical and blunt projectile shapes
were considered. Also, a comparison between two different designs of grid was
performed numerically. Grid designs were structured and unstructured grids.
Navier-Stokes equations were used as governing equations for simulating
supercavitation. Cavity shape was determined over projectile body and around
wake. Also, two-dimensional flow field around the cavitating body was determined.
Projectile body has a diameter about 0.4 times its length (0.4L). In the case of the
Blunt end there is a strong wake effect. The ESI-CFD code (2010) is valid for
observing the supercavitation phenomena. Unstructured grid is more accurate than
structured one in simulating supercavitation.

Keywords

The Egyptian International Journal of Engineering Sciences and Technology
Volume 19, EIJEST, Vol. 19, 2016
Special Issue ICESA-2016
June 2016
Pages 282-296

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