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

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.

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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.

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Correspondence to Cheng Chin.

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Chin, C., Örlü, R., Schlatter, P. et al. Influence of a Large-Eddy-Breakup-Device on the Turbulent Interface of Boundary Layers. Flow Turbulence Combust 99, 823–835 (2017). https://doi.org/10.1007/s10494-017-9861-7

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Keywords

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