What question did this study set out to answer?

Determine the impact of surface dimples on the drag coefficient and Strouhal number of a circular cylinder across a broad Reynolds number regime.

October 1, 1993AIAA Journal

Control of circular cylinder flow by the use of dimples

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Authors

PBPeter BearmanImperial College London JHJ. K. HarveyUniversity of Cambridge

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Implication

Experimental study reveals reduced drag coefficients across Reynolds numbers 4×10⁴ to 3×10⁵ in dimpled cylinders, indicating superior flow control compared to sand-roughened surfaces.

Key Points

Determine the impact of surface dimples on the drag coefficient and Strouhal number of a circular cylinder across a broad Reynolds number regime.
Measured drag coefficient and Strouhal number across a Reynolds number range from 2 × 10⁴ to 3 × 10⁵.
Tested a circular cylinder featuring surface dimples with a depth-to-diameter ratio of 9 × 10⁻³.
The dimpled cylinder exhibited a lower critical Reynolds number than a smooth cylinder.
Beyond the drag coefficient minimum, the dimpled cylinder's drag coefficient did not spike to values typical of sand-roughened surfaces, remaining closer to smooth cylinder values.
A dimpled cylinder maintained a lower drag coefficient than a smooth cylinder throughout the Reynolds number range from approximately 4 × 10⁴ to 3 × 10⁵.

Cite This Study

Bearman et al. (1993) studied this question.

synapsesocial.com/papers/69ff74926018b8d0892d8214 https://doi.org/10.2514/3.11844

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Implication

Experimental study reveals reduced drag coefficients across Reynolds numbers 4×10⁴ to 3×10⁵ in dimpled cylinders, indicating superior flow control compared to sand-roughened surfaces.

Control of circular cylinder flow by the use of dimples

Discussion

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Implication

Key Points

Cite This Study

Control of circular cylinder flow by the use of dimples

Discussion

Member takes

Implication

Key Points

Cite This Study

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