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The Influence of Spurious Periodicity on the Flow Characteristics of a Separated Turbulent Boundary Layer with and Without Active Flow Control

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Abstract

In this study, we have investigated the effects of inflow spurious periodicity on a turbulent boundary layer subjected to a weak pressure gradient due to a gently backward ramp utilizing wall-resolved large-eddy simulation. The spurious periodicity is generated through repeating segments of inflow data produced via a long boundary layer precursor simulation. Using a short segment of inflow data and recycling it while introduces a spurious periodicity, can help to reduce the computational cost of the precursor simulation as well as the storage needed to record the massive data. However, there is no quantitative analysis as to how far the results are affected by the spurious periodicity in case of a separated turbulent boundary layer. This study compares several cases with various inflow segment lengths with respect to a reference case with no periodicity. The inflow segments are created by truncating the reference case and thus an intrinsic disturbance is associated with them. An additional case without the disturbance is also considered to examine the latter’s influence on the results. First- and second-order flow statistics are assessed, and spectral analysis is conducted to scrutinize the impact of spurious periodicity. An additional second-order parameter is introduced as an indicator of the spurious periodicity influence. Finally, an especial configuration with active flow control using a synthetic jet actuator is investigated with and without the spurious periodicity. This will help to assess if the dominant frequency of the active flow control is affected by recycling inflow data.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors would like to acknowledge the computational resources from Digital Resource Alliance CANADA for providing the computational facility. Also, the research funding from the Faculty of Engineering at Dalhousie University to Mohammad Saeedi is greatly acknowledged.

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  1. Department of Mechanical Engineering, Dalhousie University, Halifax, NS, Canada

    Ehsan Asgari & Mohammad Saeedi

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  1. Ehsan Asgari
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Contributions

E.A. and M.S. both conceptualized the topic. E.A. conducted the simulations and prepared the initial manuscripts. M.S. performed the supervisory job, reviewed the work and corrected the manuscript and figures. Resources were provided by M.S. All authors reviewed the manuscript.

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Correspondence to Mohammad Saeedi.

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Asgari, E., Saeedi, M. The Influence of Spurious Periodicity on the Flow Characteristics of a Separated Turbulent Boundary Layer with and Without Active Flow Control. Flow Turbulence Combust 112, 459–482 (2024). https://doi.org/10.1007/s10494-023-00522-2

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