Near-wall stereo PIV investigation of the turbulent channel flow over rough-walls

Jiarong Hong, Joseph Katz, Michael Schultz

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

Abstract

The near-wall turbulent flow in the rough-wall channel is of great significance in engineering applications, but remains a challenge for both experimental measurement and numerical modeling due to the complexity of the roughness geometry. For optical measurement techniques, e.g. PIV, obstruction by the roughness elements and reflection from the surface adversely affect the quality of near wall data. Our present study utilizes a facility containing a fluid with the same refractive index as the rough acrylic wall, making the interface almost invisible, and employs Stereo PIV to obtain the three-dimensional flow field in the vicinity of the roughness elements. The roughness shape is a uniformly distributed and closely packed, 0.5 mm high pyramid, corresponding to 95 wall units, with a pitch angle of 22.5 degrees. The length of the rough surface is sufficiently long to obtain self-similar roughness boundary layer, turbulent channel flow at a mean velocity of 3.8 m/s, with a clearly defined log layer. Results will include sample data of the complete flow, both around and above the roughness elements. Issues related to implementation of Stereo PIV in an index-matched facility will be discussed.

Original languageEnglish (US)
Title of host publication2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008
Pages683-690
Number of pages8
EditionPART A
DOIs
StatePublished - Sep 18 2009
Event2008 ASME Fluids Engineering Division Summer Conference, FEDSM 2008 - Jacksonville, FL, United States
Duration: Aug 10 2008Aug 14 2008

Publication series

Name2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008
NumberPART A
Volume1

Other

Other2008 ASME Fluids Engineering Division Summer Conference, FEDSM 2008
CountryUnited States
CityJacksonville, FL
Period8/10/088/14/08

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