Possible modification of the large-scale flow structures by vortical structural interactions

Title

Possible modification of the large-scale flow structures by vortical structural interactions

 Author

Goudar Vishwanathappa, M.
Elsinga, G.E.

Faculty

Mechanical, Maritime and Materials Engineering

 Department

Process and Energy

 Date

2014-03-31

 Abstract

We explore the mechanisms behind vortical structural interactions modifying largescale structures in wall turbulence. The evidence for this in terms of vortex interactions, such as merging and intense vortex strengthening, is found in [4] in ideal flow conditions. Here, these interactions are studied experimentally and numerically in turbulent boundary layer and channel flows respectively. This is done by extracting statistical information from conditional averaging of different events based on the spanwise swirling strength. Experimental results showed vortex merger leading to vortex intensification. This was in good agreement with the results of [4]. However, numerical results did not show complete agreement with experimental results. This may be due to the difference in spatial resolution of experimental and numerical data. Furthermore, the peak Reynolds shear stress did reveal a relative increase in magnitude when two vortices merged in the numerical data.

 To reference this document use:

http://resolver.tudelft.nl/uuid:c4091b00-0234-49ba-839f-a3813cb2a0b6

 DOI

https://doi.org/10.1088/1742-6596/506/1/012012

 ISSN

1742-6596

 Source

Journal of Physics: conference series, 506 (1), 2014

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

(c) 2014 The Author(s)
Published under licence by IOP Publishing Ltd
Files
PDF Goudar.pdf 1.7 MB
Close viewer