Flow Field Analysis of a Turbulent Channel Controlled by Scalloped Riblets DOI Creative Commons
Haidong Yu, Yi Huang, Yiqian Wang

et al.

Aerospace Research Communications, Journal Year: 2023, Volume and Issue: 1

Published: Dec. 18, 2023

Riblets are small protruding surfaces along the direction of flow, and one most well-known passive turbulent drag reduction methods. We investigated a scalloped riblet, shape which was constructed by smoothly connecting two third-order polynomials not as sharp in tip corresponding triangular riblets with same height-width ratio. Numerical simulations were performed for channel flow without riblet control at an estimated optimum width W+=20 ratio id="m2">0.5 . A rate id="m3">5.77% obtained, is generally larger than reported rates from literature. Mean fields second-order statistics velocity, vorticity, Liutex, quantity introduced to represent vortices, reported. It found that streamwise vortices just above tips, have length scale id="m4">200−300 wall units, important influence on those thus turbulence generation cycle mechanism. Pre-multiplied energy spectra velocity Liutex component reveal scales field. Instantaneous vortical visualized method provided emphases tips. should be noted class suitable investigations influences curvatures valley future.

Language: Английский

Flow Field Analysis of a Turbulent Channel Controlled by Scalloped Riblets DOI Creative Commons
Haidong Yu, Yi Huang, Yiqian Wang

et al.

Aerospace Research Communications, Journal Year: 2023, Volume and Issue: 1

Published: Dec. 18, 2023

Riblets are small protruding surfaces along the direction of flow, and one most well-known passive turbulent drag reduction methods. We investigated a scalloped riblet, shape which was constructed by smoothly connecting two third-order polynomials not as sharp in tip corresponding triangular riblets with same height-width ratio. Numerical simulations were performed for channel flow without riblet control at an estimated optimum width W+=20 ratio id="m2">0.5 . A rate id="m3">5.77% obtained, is generally larger than reported rates from literature. Mean fields second-order statistics velocity, vorticity, Liutex, quantity introduced to represent vortices, reported. It found that streamwise vortices just above tips, have length scale id="m4">200−300 wall units, important influence on those thus turbulence generation cycle mechanism. Pre-multiplied energy spectra velocity Liutex component reveal scales field. Instantaneous vortical visualized method provided emphases tips. should be noted class suitable investigations influences curvatures valley future.

Language: Английский

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