Proper orthogonal decomposition of the flow in geometries containing a narrow gap |
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Authors: | Elia Merzari H Ninokata A Mahmood M Rohde |
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Institution: | (1) Department of Nuclear Science and Engineering, Naval University of Engineering, 717 Jiefang Street, Wuhan, 430033, China;(2) School of Nuclear Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, China |
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Abstract: | Geometries containing a narrow gap are characterized by strong quasi-periodical flow oscillations in the narrow gap region.
The above mentioned phenomena are of inherently unstable nature and, even if no conclusive theoretical study on the subject
has been published, the evidence shown to this point suggests that the oscillations are connected to interactions between
eddy structures of turbulent flows on opposite sides of the gap. These coherent structures travel in the direction of homogeneous
turbulence, in a fashion that strongly recalls a vortex street. Analogous behaviours have been observed for arrays of arbitrarily
shaped channels, within certain range of the geometric parameters. A modelling for these phenomena is at least problematic
to achieve since they are turbulence driven. This work aims to address the use of Proper Orthogonal Decomposition (POD) to
reduce the Navier–Stokes equations to a set of ordinary differential equations and better understand the dynamics underlying
these oscillations. Both experimental and numerical data are used to carry out the POD. |
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Keywords: | |
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