The University of Southampton
University of Southampton Institutional Repository

Flow control of circular cylinder with a V-grooved micro-riblet film

Lee, Sang-Joon, Lim, Hee-Chang, Han, Manhee and Lee, Seung S. (2005) Flow control of circular cylinder with a V-grooved micro-riblet film Fluid Dynamics Research, 37, (4), pp. 246-266. (doi:10.1016/j.fluiddyn.2005.05.002).

Record type: Article


Flow structure around a circular cylinder with a V-grooved micro-riblet is investigated experimentally. The results are compared with that of a smooth cylinder having the same diameter. A flexible V-shaped micro-riblet with peak-to-peak spacing of is made using a MEMS fabrication process of PDMS (Polydimethylsiloxane) replica. The flexible micro-riblet is attached on a circular cylinder with which grooves are aligned with the streamwise flow direction. Drag force acting on the cylinder is measured for Reynolds numbers based on a cylinder diameter in the range ReD=2.5×103–3.8×104. At , the V-grooved micro-riblet cylinder reduces drag coefficient by 7.6%, compared with a cylinder with smooth PDMS surface. However, it increases drag coefficient about 4.2% at . Flow field around the micro-riblet cylinder is measured by using a 2-frame PIV velocity field measurement technique. Several hundreds instantaneous velocity fields are ensemble-averaged to get the spatial distributions of turbulent statistics including turbulence intensities and turbulent kinetic energy. For the case of drag reduction at ReD=4.8×103, the vortex formation region behind the V-grooved MRF cylinder is reduced about 10%, compared with the smooth cylinder due to enhanced entrainment of ambient inviscid fluid into the wake region. In addition, the total number of secondary vortices located inside the near wake region is decreased about 20%.

Full text not available from this repository.

More information

Published date: 2005
Keywords: flow control, micro-riblet, v-groove, drag reduction, piv, mems


Local EPrints ID: 23497
ISSN: 0169-5983
PURE UUID: 8dff72c3-c3a0-4bde-97ab-edbb1a034d83

Catalogue record

Date deposited: 10 Mar 2006
Last modified: 17 Jul 2017 16:17

Export record



Author: Sang-Joon Lee
Author: Hee-Chang Lim
Author: Manhee Han
Author: Seung S. Lee

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.