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Flow, Turbulence and Combustion

, Volume 99, Issue 3–4, pp 823–835 | Cite as

Influence of a Large-Eddy-Breakup-Device on the Turbulent Interface of Boundary Layers

  • Cheng Chin
  • Ramis Örlü
  • Philipp Schlatter
  • Jason Monty
  • Nicholas Hutchins
Article

Abstract

The effects of implementing a large-eddy break-up device (LEBU) in a turbulent boundary layer on the interaction with the boundary layer is investigated with particular emphasis on the turbulent/non-turbulent interface (TNTI). The simulation data is taken from a recent well-resolved large eddy simulation (Chin et al. Flow Turb. Combust. 98, 445–460 2017), where the LEBU was implemented at a wall-normal distance of 0.8 δ (local boundary layer thickness) from the wall. A comparison of the TNTI statistics is performed between a zero-pressure-gradient boundary layer with and without the LEBU. The LEBU is found to delay the growth of the turbulent boundary layer and also attenuates the fluctuations of the TNTI. The LEBU appears to alter the structure size at the interface, resulting in a narrower and shorter dominant structure (in an average sense). Further analysis beneath the TNTI using two-point correlations shows that the LEBU affects the turbulent structures in excess of 100 δ downstream of the LEBU.

Keywords

Large eddy simulation Wall-bounded turbulence Large-eddy-break-up device Turbulent/non-turbulent interface 

Notes

Acknowledgements

This research was undertaken with the assistance of resources provided at the NCI NF through the National Computational Merit Allocation Scheme supported by the Australian Government. Computer time was also provided by SNIC (Swedish National Infrastructure for Computing). The authors also acknowledge the financial support of the Australian Research Council as well as the Lundeqvist foundation. Financial support was also provided by the Wallenberg foundation via the Wallenberg Academy Fellow programme.

Compliance with Ethical Standards

Conflict of interests

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.School of Mechanical EngineeringUniversity of AdelaideAdelaideAustralia
  2. 2.Linné FLOW Centre, KTH MechanicsRoyal Institute of TechnologyStockholmSweden
  3. 3.Department of Mechanical EngineeringUniversity of MelbourneParkvilleAustralia

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