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Turbulent flow in a ribbed channel analysed by the proper orhtogonal decomposition

In English

Författare

Redaktör

  • J. S. Szmyd
  • J Spalek
  • T.A. Kowalewski

Summary, in English

Particle image velocimetry (PIV) measurements and proper orthogonal decomposition (POD) are used to explore the turbulent structures in a ribbed channel. In this study, only one channel wall is equipped with square ribs which are oriented transversely to the main stream direction. The ribs obstruct the channel by 20% of its height and are arranged 10 rib heights apart. The results include mean streamlines, Reynolds shear stresses, two-point correlation coefficients, POD eigenvalues and eigenfunctions. By means of the POD analysis, the underlying flow features are identified, which are the strong upward ejections from the leading edge of the rib. Essentially, these motions give rise to the sharp peaks in the fluctuating turbulent kinetic energy and make great contributions to the Reynolds shear stress.

Publiceringsår

2009

Språk

Engelska

Sidor

1-1

Publikation/Tidskrift/Serie

[Host publication title missing]

Dokumenttyp

Konferensbidrag

Förlag

AHG University of Science and Technology Press

Ämne

  • Energy Engineering

Nyckelord

  • Particle image velocimetry
  • proper orthogonal decomposition

Conference name

ExHFT-7 7th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics

Conference date

2009-06-28 - 2009-07-03

Conference place

Krakow, Poland

Status

Published

Forskningsgrupp

  • heat transfer

ISBN/ISSN/Övrigt

  • ISBN: 978-83-7464-235-4