Flow separation experiments over a forward facing step immersed in a turbulent boundary layer subjected to various levels of freestream turbulence intensity have been undertaken in a water channel. Freestream turbulence was generated using two traditional grids and a third, novel tethered sphere design, which was shown to dramatically increase the turbulence intensity produced. Planar particle image velocimetry was used to characterise the mean recirculation region. The dynamic of the reattachment length was also investigated using instantaneous velocity realisations. It was found that bluff body geometry effects were dominant over the freestream turbulence intensity close to the separation point. Downstream of the separation point, the turbulence level was seen to increase mixing between the high momentum freestream flow and the adverse flow within the recirculation region promoting reattachment.
|Title of host publication||17th Australasian Fluid Mechanics Conference 2010|
|Number of pages||4|
|Publication status||Published - 2010|
|Event||Australasian Fluid Mechanics Conference 2010 - Auckland New Zealand, Auckland, New Zealand|
Duration: 5 Dec 2010 → 9 Dec 2010
Conference number: 17th
|Conference||Australasian Fluid Mechanics Conference 2010|
|Abbreviated title||AFMC 2010|
|Period||5/12/10 → 9/12/10|
|Other||The Australasian Fluid Mechanics Conference has grown steadily from its beginning at the University of Western Australia in 1962. The conference series has traditionally covered the broad field of fluid mechanics in all engineering and scientific disciplines. It provides a forum for presentation of papers in all aspects of fundamental and applied fluid mechanics.|
Proceedings of the 17th Australasian Fluid Mechanics Conference 5-9th December 2010 was edited by Prof. G.D. Mallinson and Dr J.E. Cater and published by the Faculty of Engineering in association with the Centre for Continuing Education The University of Auckland.