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High-reynolds number flow around coated symmetrical hydrofoil: effect of streamwise slip on drag force and vortex structures

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Abstract

Effects of slip on the flow around a symmetrical hydrofoil with a blunt trailing-edge are numerically investigated at Reynolds numbers of \(Re=5 \times {10^6}\), \(12.5 \times {10^6}\) and \(25 \times {10^6}\) based on the free-stream velocity and chord length. The simulations are performed by applying a two-dimensional Unsteady Reynolds–Averaged Navier–Stokes (URANS) approach and SST k–ω turbulence model. Furthermore, the Navier boundary condition with different slip lengths (\({L_{\text{s}}}=\;{\text{2}},{\text{ 35 and 7}}0\) µm) is employed on the surfaces. The results indicate that the Ls has a considerable effect on the integral parameters and a moderate influence on the wake flow structure. As such, a massive drag reduction (up to 47%) is observed, and an increase of Ls causes the increase of both frictional and pressure drag reduction rate. It is shown that a noticeable drag reduction can be achieved when the non-dimensional slip length is larger than one. The increment of slip length also leads to increase the amplitude of force fluctuations and frequency of vortex shedding; besides, the strength of vortex structures and the turbulence intensities are augmented.

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Acknowledgements

The authors would like to thank the Islamic Azad University- East Tehran Branch, Iran for providing computing facilities and fund. The first author also gratefully acknowledges Dr. Danielle Moreau for her significant and constructive contribution to the presented work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, 83111-84156, Iran

    M. R. Rastan

  2. School of Mechanical and Manufacturing Engineering, UNSW, Sydney, NSW, 2052, Australia

    M. R. Rastan

  3. Department of Mechanical Engineering, Shiraz University, Shiraz, 71348-51154, Iran

    S. Foshat

  4. Department of Mechanical Engineering, Islamic Azad University East Tehran Branch, Tehran, 33955-163, Iran

    S. Sekhavat

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  1. M. R. Rastan
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  2. S. Foshat
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  3. S. Sekhavat
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Correspondence to S. Sekhavat.

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Rastan, M.R., Foshat, S. & Sekhavat, S. High-reynolds number flow around coated symmetrical hydrofoil: effect of streamwise slip on drag force and vortex structures. J Mar Sci Technol 24, 500–511 (2019). https://doi.org/10.1007/s00773-018-0570-2

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  • DOI: https://doi.org/10.1007/s00773-018-0570-2

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