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Turbulent fluid flow over aerodynamically rough surfaces using direct numerical simulations

Turbulent fluid flow over aerodynamically rough surfaces using direct numerical simulations
Turbulent fluid flow over aerodynamically rough surfaces using direct numerical simulations

Incompressible turbulent fluid flow in aerodynamically rough channels is investigated using direct numerical simulations. A comprehensive database of simulation data for rough surfaces with different topographical properties has been developed for 17 industrially relevant rough surface samples. It includes numerous commonly-seen industrial rough surfaces such as concrete, graphite, carbon-carbon composite and ground, shotblasted and spark-eroded steel. Other surfaces such as cast, filed and gritblasted steel are also studied, along with replicas of ship propeller surfaces eroded by periods of service. The Reynolds number considered is Reτ = 180, for which the flow is in the transitionally rough regime. A study with variable δ/Sq ratio, while keeping Sq + constant, where Sq is the root mean squared roughness height, is conducted for one of the samples with the mean profiles showing convergence for δ/Sq >≈ 25. A Reynolds number dependence study is conducted for two of the samples with Reτ up to 720 showing a more complete range up to the fully rough flow regime, allowing the equivalent sandgrain roughness height, ks, to be computed. A correlation based on the frontal and wetted roughness area is found to be superior to the surface skewness in predicting ΔU+ based on the topographic surface parameters.

281-287
Springer
Thakkar, M.
0c465d92-64b4-4c9e-b34f-4095c89a240f
Busse, A.
0430b320-341b-4c73-9cb5-f35632d562a4
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Thakkar, M.
0c465d92-64b4-4c9e-b34f-4095c89a240f
Busse, A.
0430b320-341b-4c73-9cb5-f35632d562a4
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97

Thakkar, M., Busse, A. and Sandham, N.D. (2018) Turbulent fluid flow over aerodynamically rough surfaces using direct numerical simulations. In, Direct and Large-Eddy Simulation X. (ERCOFTAC Series, , (doi:10.1007/978-3-319-63212-4_35), 24) Cham. Springer, pp. 281-287. (doi:10.1007/978-3-319-63212-4_35).

Record type: Book Section

Abstract

Incompressible turbulent fluid flow in aerodynamically rough channels is investigated using direct numerical simulations. A comprehensive database of simulation data for rough surfaces with different topographical properties has been developed for 17 industrially relevant rough surface samples. It includes numerous commonly-seen industrial rough surfaces such as concrete, graphite, carbon-carbon composite and ground, shotblasted and spark-eroded steel. Other surfaces such as cast, filed and gritblasted steel are also studied, along with replicas of ship propeller surfaces eroded by periods of service. The Reynolds number considered is Reτ = 180, for which the flow is in the transitionally rough regime. A study with variable δ/Sq ratio, while keeping Sq + constant, where Sq is the root mean squared roughness height, is conducted for one of the samples with the mean profiles showing convergence for δ/Sq >≈ 25. A Reynolds number dependence study is conducted for two of the samples with Reτ up to 720 showing a more complete range up to the fully rough flow regime, allowing the equivalent sandgrain roughness height, ks, to be computed. A correlation based on the frontal and wetted roughness area is found to be superior to the surface skewness in predicting ΔU+ based on the topographic surface parameters.

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More information

e-pub ahead of print date: 8 October 2017
Published date: 2018

Identifiers

Local EPrints ID: 417479
URI: http://eprints.soton.ac.uk/id/eprint/417479
PURE UUID: 609c1c57-996a-4d98-a7be-4ac040e46330
ORCID for N.D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944

Catalogue record

Date deposited: 01 Feb 2018 17:30
Last modified: 07 Oct 2020 01:42

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