Abstract
Two types of wall actuation in channel flow are considered: travelling waves of wall deformation (peristalsis) and travelling waves of blowing and suction. The flow response and its mechanisms are analysed using nonlinear and weakly nonlinear computations. We show that both actuations induce a flux in the channel in the absence of an imposed pressure gradient and can thus be characterized as pumping. In the context of flow control, pumping and drag reduction are strongly connected, and we seek to define them properly based on these two actuation examples. Movies showing the flow motion for the two types of actuation are available with the online version of this paper (journals.cambridge.org/FLM).
| Original language | English |
|---|---|
| Pages (from-to) | 171-187 |
| Number of pages | 17 |
| Journal | Journal of Fluid Mechanics |
| Volume | 635 |
| DOIs | |
| Publication status | Published - 2009 Sep |
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ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
- Condensed Matter Physics
Cite this
Pumping or drag reduction? / Hpffner, Jrme; Fukagata, Koji.
In: Journal of Fluid Mechanics, Vol. 635, 09.2009, p. 171-187.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Pumping or drag reduction?
AU - Hpffner, Jrme
AU - Fukagata, Koji
PY - 2009/9
Y1 - 2009/9
N2 - Two types of wall actuation in channel flow are considered: travelling waves of wall deformation (peristalsis) and travelling waves of blowing and suction. The flow response and its mechanisms are analysed using nonlinear and weakly nonlinear computations. We show that both actuations induce a flux in the channel in the absence of an imposed pressure gradient and can thus be characterized as pumping. In the context of flow control, pumping and drag reduction are strongly connected, and we seek to define them properly based on these two actuation examples. Movies showing the flow motion for the two types of actuation are available with the online version of this paper (journals.cambridge.org/FLM).
AB - Two types of wall actuation in channel flow are considered: travelling waves of wall deformation (peristalsis) and travelling waves of blowing and suction. The flow response and its mechanisms are analysed using nonlinear and weakly nonlinear computations. We show that both actuations induce a flux in the channel in the absence of an imposed pressure gradient and can thus be characterized as pumping. In the context of flow control, pumping and drag reduction are strongly connected, and we seek to define them properly based on these two actuation examples. Movies showing the flow motion for the two types of actuation are available with the online version of this paper (journals.cambridge.org/FLM).
UR - http://www.scopus.com/inward/record.url?scp=76249127306&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=76249127306&partnerID=8YFLogxK
U2 - 10.1017/S0022112009007629
DO - 10.1017/S0022112009007629
M3 - Article
AN - SCOPUS:76249127306
VL - 635
SP - 171
EP - 187
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
SN - 0022-1120
ER -