A fast and direct method for characterizing hydraulic roughness

D. Chung, M. MaCdonald, L. Chan, N. Hutchins, A. Ooi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We describe a fast direct numerical simulation (DNS) method that promises to directly characterize the hydraulic resistance of any given rough surface, from the hydrauli-cally smooth to the fully rough regime. The method circumvents the unfavorable computational cost associated with simulating high-Reynolds-number flows by employing minimal-span channels (Jimenez & Moin, 1991). Proof-of-concept simulations, employing the parametric-forcing roughness model (Busse & Sandham, 2012), demonstrate that flows simulated in minimal-span channels are sufficient for capturing the downward velocity shift predicted by flows in full-span channels. Owing to the minimal cost, we are able to conduct parametric DNSs with increasing roughness Reynolds numbers while maintaining a fixed roughness height that is 40 times smaller than the half-channel height. When coupled to an unstructured-grid code, the present method promises a practical, fast and accurate tool for characterizing hydraulic resistance directly from pro-filometry data of rough surfaces.

Original languageEnglish
Title of host publication9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
PublisherTSFP-9
ISBN (Electronic)9780000000002
Publication statusPublished - 01 Jan 2015
Event9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 - Melbourne, Australia
Duration: 30 Jun 201503 Jul 2015

Publication series

Name9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
Volume1

Other

Other9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
CountryAustralia
CityMelbourne
Period30/06/1503/07/15

Fingerprint

Surface roughness
Hydraulics
Reynolds number
Direct numerical simulation
Costs

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

Cite this

Chung, D., MaCdonald, M., Chan, L., Hutchins, N., & Ooi, A. (2015). A fast and direct method for characterizing hydraulic roughness. In 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 (9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015; Vol. 1). TSFP-9.
Chung, D. ; MaCdonald, M. ; Chan, L. ; Hutchins, N. ; Ooi, A. / A fast and direct method for characterizing hydraulic roughness. 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015. TSFP-9, 2015. (9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015).
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Chung, D, MaCdonald, M, Chan, L, Hutchins, N & Ooi, A 2015, A fast and direct method for characterizing hydraulic roughness. in 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015. 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015, vol. 1, TSFP-9, 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015, Melbourne, Australia, 30/06/15.

A fast and direct method for characterizing hydraulic roughness. / Chung, D.; MaCdonald, M.; Chan, L.; Hutchins, N.; Ooi, A.

9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015. TSFP-9, 2015. (9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015; Vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Chung D, MaCdonald M, Chan L, Hutchins N, Ooi A. A fast and direct method for characterizing hydraulic roughness. In 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015. TSFP-9. 2015. (9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015).