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Force analysis of underwater object with supercavitation evolution

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Title Force analysis of underwater object with supercavitation evolution
 
Creator Khoo, B C
Zheng, J G
 
Subject Supercavitating flow
Isentropic cavitation model
Underwater object
Navier-Stokes equations
 
Description 957-963
Supercavitation generally occurs as a result
of flow acceleration along underwater body
surface and is numerically investigated in this study using a compressible
Navier-Stokes equations solver. Here, the supercavitating flow is assumed to be
the homogeneous mixture of pure liquid water and vapour which are in kinematic
and thermodynamic equilibrium. Liquid phase and cavitation are modeled by
Tait equation of state (EOS) and isentropic one-fluid
formulation, respectively. Convective terms of the governing equations are
numerically integrated using Godunov-type, cell-centered finite volume MUSCL
scheme on unstructured triangular mesh, whereas time integration is handled
with the second-order accurate Runge-Kutta approach. Our interest is focused on
the force analysis of traveling object with the formation, growth, evolution
and even collapse of supercavity enveloping the object. It is found that skin
friction drag exerted on the object can be reduced significantly by the
formation of supercavity where viscosity of vapour is much smaller than that of
liquid water. It is also observed that form drag
acting on the object is influenced by the supercavitation. Collapse of
supercavity over the body due to external perturbation not only damages
underwater object but also alters form drag on it.
 
Date 2014-01-10T11:56:03Z
2014-01-10T11:56:03Z
2013-12
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/25473
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.42(8) [December 2013]