Turbulent wakes in turbulent streams

Direct numerical simulation and wind tunnel experiments have been used to study the effects<br/>of free-stream turbulence on axisymmetric wakes. In both cases the wake was introduced to<br/>various turbulent streams having various levels of turbulence intensity and length scales. It<br/>was found that the presence of the free-stream turbulence changes the wake’s decay rate and<br/>does not allow self-similarity to occur (unless maybe very far downstream and way beyond<br/>the current measurements reached). Also, the free-stream turbulence was found to be causing<br/>a significant transformation in the turbulence structure inside the wake, where the latter was<br/>found to be gradually evolving towards the former. Last, the fact that the two approaches<br/>were modelling two different problems led to some differences in their results emphasising the<br/>importance of the flow structure around the wake generating body in shaping the far wake<br/>region.

Name dc:type.qualificationname

Ph.D.

Level dc:type.qualificationlevel

doctoral

Grantor dc:publisher.institution

University of Southampton

Year dc:date.issued

2011

Author dc:creator

• Rind, Elad

Advisor dc:contributor.advisor

• Castro, Ian P.