Tomographic PIV assessment of turbulence characteristics in the developing region of a turbulent round jet

Khashehchi, Morteza, Elsinga, Gerrit E., Hooman, Kamel, Ooi, Andrew, Soria, Julio and Marusic, Ivan (2012). Tomographic PIV assessment of turbulence characteristics in the developing region of a turbulent round jet. In: 16th International Symposia on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, (1-13). 9-12 July 2012.

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Name Description MIMEType Size Downloads
Author Khashehchi, Morteza
Elsinga, Gerrit E.
Hooman, Kamel
Ooi, Andrew
Soria, Julio
Marusic, Ivan
Title of paper Tomographic PIV assessment of turbulence characteristics in the developing region of a turbulent round jet
Conference name 16th International Symposia on Applications of Laser Techniques to Fluid Mechanics
Conference location Lisbon, Portugal
Conference dates 9-12 July 2012
Publication Year 2012
Sub-type Fully published paper
Start page 1
End page 13
Total pages 13
Collection year 2013
Language eng
Formatted Abstract/Summary
Tomographic Particle Image Velocimetry (TPIV) was used to study the initial transition process formed in a free jet between the laminar flow at the jet exit, and the fully turbulent flow region at Re=6500. The evolution of the turbulence characteristics in this particular region has been assessed by means of the invariants of the Velocity Gradient Tensor (VGT). These invariants enable us to study the dynamics, geometry and topology of the flow. A mapping from the three-dimensional flow fields to a two dimensional invariants plane is used to analyze the dissipation of kinetic energy at small scales and the amplification of local vorticity due to vortex stretching. A systematic study of the event that represents the persistent alignment of the vorticity vector with the second eigenvector of the rate of strain tensor was examined, and the results of this phenomenon at the near-field of the jet are discussed. Results show that vorticity vector, ω, maintains its alignment with the intermediate eigenvector of the rate of strain tensor, υ2, in the developing region by either the rotation of the intermediate eigenframe or the tilting of ω.
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Mechanical & Mining Engineering Publications
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Created: Tue, 15 Jan 2013, 10:17:19 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering