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Kollert, Matthias R.
Publications (2 of 2) Show all publications
Shahriari, N., Kollert, M. R. & Hanifi, A. (2018). Control of a swept-wing boundary layer using ring-type plasma actuators. Journal of Fluid Mechanics, 844, 36-60
Open this publication in new window or tab >>Control of a swept-wing boundary layer using ring-type plasma actuators
2018 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 844, p. 36-60Article in journal (Refereed) Published
Abstract [en]

Application of ring-type plasma actuators for control of laminar-turbulent transition in a swept-wing boundary layer is investigated thorough direct numerical simulations. These actuators induce a wall-normal jet in the boundary layer and can act as virtual roughness elements. The flow configuration resembles experiments by Kim et al. (2016 Technical Report. BUTERFLI Project TR D3.19, http://eprints.nottingham.ac.uk/id/eprint/46529). The actuators are modelled by the volume forces computed from the experimentally measured induced velocity field at the quiescent air condition. Stationary and travelling cross-flow vortices are triggered in the simulations by means of surface roughness and random unsteady perturbations. Interaction of vortices generated by actuators with these perturbations is investigated in detail. It is found that, for successful transition control, the power of the actuators should be increased to generate jet velocities that are one order of magnitude higher than those used in the experiments by Kim et al. (2016) mentioned above.

Place, publisher, year, edition, pages
Cambridge University Press, 2018
Keywords
boundary layer control, boundary layer stability, transition to turbulence
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-227547 (URN)10.1017/jfm.2018.195 (DOI)000448727700001 ()2-s2.0-85044771928 (Scopus ID)
Funder
Swedish e‐Science Research Center
Note

QC 20180517

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-11-14Bibliographically approved
Shahriari, N., Kollert, M. R. & Hanifi, A. Passive control of a swept-wing boundary layer using ring-type plasma actuators. Journal of Fluid Mechanics
Open this publication in new window or tab >>Passive control of a swept-wing boundary layer using ring-type plasma actuators
(English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645Article in journal (Refereed) Submitted
Abstract [en]

Application of the ring-type plasma actuators for passive control of laminar- turbulent transition in a swept-wing boundary layer is investigated thorough direct numerical simulations. These actuators induce a wall-normal jet in the boundary layer and can act as virtual roughness elements. The flow configuration resembles experiments of Kim et al. (2016). The actuators are modelled by the volume forces computed from the experimentally measured induced velocity filed at the quiescent air condition. The natural surface roughness and unsteady perturbations are also included in the simulations. The interaction of generated vortices by the actuators with these perturbations is investigated in details. It is found that for a successful transition control the power of the actuator should be increased to generate a jet velocity one order of magnitude higher than that in the considered experiments. 

Place, publisher, year, edition, pages
Cambridge University Press
Keywords
boundary layer control, boundary layer receptivity, ring-type plasma actuators, crossflow vortices
National Category
Mechanical Engineering Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-196876 (URN)
Note

QC 20161125

Available from: 2016-11-24 Created: 2016-11-24 Last updated: 2017-11-29Bibliographically approved
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