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Representing the Small Scales of Turbulence by Periodic Box Homogeneous Isotropic Turbulence Simulations

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Abstract

Large Eddy Simulations (LESs) use Sub-Grid Scale (SGS) models to account for the effects of the unresolved scales of turbulence. The complex processes that occur in the small scales make the development of SGS models challenging. This complexity is even compounded in the presence of multiphase physics due to the mutual interactions between the small-scale hydrodynamics and the dispersed phase distribution and behaviour. In this study, we propose to avoid using an SGS model and demonstrate a novel technique to use a Periodic Box (PB) Direct Numerical Simulation (DNS) solver to find and represent the local SGS turbulence for supplementing a LES. This technique involves matching the local characteristic strain rate in the LES with the large-scale characteristic strain rate in the PB DNS. For simplicity, we assume Homogeneous Isotropic Turbulence (HIT) to be a good representation of SGS turbulence. For a test case, viz. HIT, we compare the averaged turbulence spectra from the LES and the PB DNS with the exact solution from a full DNS simulation. The results show an almost seamless coupling between the large and small scales. As such, this model is more accurate than the common Smagorinsky model in describing the properties of small scales while working within the same assumptions. Further, the effective Smagorinsky constant predicted by our model and the DNS simulation agree. Finally, a two-way coupling is introduced where an effective viscosity is computed in the PB DNS and supplied back to the LES. The results show a definitive improvement in the LES while maintaining stability. The findings showcase the capability of a PB DNS to support a LES with a near-exact simulation of the SGS turbulence.

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Data Availability

All data generated in this study are available on request.

Change history

  • 29 October 2023

    The original online version of this article was revised: In the reference list the name 'Stefano, G.' was corrected to 'De Stefano, G.'

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Acknowledgements

We wish to acknowledge the financial support from Science Foundation Ireland (SFI) co-funded under the European Regional Development: 12/RC/2275_P2.

Funding

This project was supported by the Science Foundation Ireland (SFI) co-funded under the European Regional Development: 12/RC/2275_P2.

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Contributions

The authors confirm their contribution to the paper as follows: Study conception and design: GTZ and HVdA Data collection:: GTZ and HVdA Interpretation of results: GTZ and HVdA Draft manuscript preparation: GTZ Project guidance: HVdA. All authors reviewed the results and approved the final version of the manuscript.

Corresponding author

Correspondence to Githin Tom Zachariah.

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I declare that the authors have no competing interests as defined by Springer, or other interests that might be perceived to influence the results and/or discussion reported in this paper.

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Zachariah, G.T., Van den Akker, H.E.A. Representing the Small Scales of Turbulence by Periodic Box Homogeneous Isotropic Turbulence Simulations. Flow Turbulence Combust 111, 1101–1126 (2023). https://doi.org/10.1007/s10494-023-00497-0

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  • DOI: https://doi.org/10.1007/s10494-023-00497-0

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