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Volume 13, Issue 25 (9-2017)
Marine Engineering 2017, 13(25): 35-46 |
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madoliat R, nouri N M, fadaei roodi R. Dynamic Behavior Identification of Cavitating Flow. Marine Engineering 2017; 13 (25) :35-46
URL: http://marine-eng.ir/article-1-494-en.html
URL: http://marine-eng.ir/article-1-494-en.html
1- Mech. Eng., Iran University of Science and Technology
2- full Prof. of Mech. Eng., Iran University of Science and Technology, Tehran, Iran
3- Ph.D Studen., ferdowsi University of mashhad, mashhad, Iran
2- full Prof. of Mech. Eng., Iran University of Science and Technology, Tehran, Iran
3- Ph.D Studen., ferdowsi University of mashhad, mashhad, Iran
Abstract: (3788 Views)
Studying the behaviour of supercavitation from the energy aspect can be divided into two sections. Studying the behavior of supercavitation in the flow field and in vicinity of the flow field. A large portion of field energy is kept in the field, and the rest of it distributed as noise (sound) out of the field. In this paper, harmonious structures of the field which are flowing as energy sources are decomposed by POD method (Proper Orthogonal Decomposition) and presented as spatial modes. The behavior of each mode and therefore behavior of supercavitation can be estimated by studying behavior of supercavitation in nearby area by decomposing the spatial modes via Helmholz decomposition to vectorial and Scalar potential function and then modelling of potential section of scalar to spherical harmonics. By investigating spatial modes, the first mode which has the highest energy is known as mean flow and by studying the intensity of spherical harmonic modes it can be shown that dipole source is an appropriate representative for field behavior in the nearby area and as a result supercavitation behavior in far feild.
Type of Study: Research Paper |
Subject:
Offshore Hydrodynamic
Received: 2016/05/26 | Accepted: 2016/12/11
Received: 2016/05/26 | Accepted: 2016/12/11
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