DNS of separated flows under the influence of wakes

A. G. Gungor; M. P. Simens; J. Jimenez

DNS of separated flows under the influence of wakes

A. G. Gungor^*
, M. P. Simens
, J. Jimenez

^*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: Kitap/Rapor/Konferans Bildirisinde Bölüm › Konferans katkısı › bilirkişi

Özet

The effect of wakes on a separated boundary layer over a flat plate is investigated by direct numerical simulation. The flow separates due to a strong adverse pressure gradient induced by suction along the upper simulation boundary. The forcing Strouhal number St = fLx/Uref of the wakes ranges from 0 to 2.9. Each forcing pulse generates three roll-up vortices, which originate near the separation point and convect with approximately half the local free-stream velocity. The separation and reattachment points vary with the forcing frequency, the size of the separated region is shortened significantly for high forcing frequencies, but no other significant variations of the mean boundary layer properties are observed unless the separation bubble is allowed to fully reform. The separation lengths of the periodic cases can be estimated from a single recovery experiment in which the forcing is suddenly removed.

Orijinal dil	İngilizce
Ana bilgisayar yayını başlığı	9th European Conference on Turbomachinery
Ana bilgisayar yayını alt yazısı	Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings
Editörler	M. Sen, G. Bois, M. Manna, T. Arts
Yayınlayan	Istanbul Technical University
Sayfalar	109-118
Sayfa sayısı	10
ISBN (Elektronik)	9789755613901
Yayın durumu	Yayınlandı - 2011
Harici olarak yayınlandı	Evet
Etkinlik	9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Istanbul, Turkey Süre: 21 Mar 2011 → 25 Mar 2011

Yayın serisi

Adı	9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings
Hacim	1

???event.eventtypes.event.conference???

???event.eventtypes.event.conference???	9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011
Ülke/Bölge	Turkey
Şehir	Istanbul
Periyot	21/03/11 → 25/03/11

Bibliyografik not

Publisher Copyright:
Copyright © 2011 Local Organising Commitee.

Diğer Dosyalar ve Linkler

Link to publication in Scopus

Alıntı Yap

Gungor, A. G., Simens, M. P., & Jimenez, J. (2011). DNS of separated flows under the influence of wakes. In M. Sen, G. Bois, M. Manna, & T. Arts (Eds.), 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings (pp. 109-118). (9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings; Hac. 1). Istanbul Technical University.

Gungor, A. G. ; Simens, M. P. ; Jimenez, J. / DNS of separated flows under the influence of wakes. 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings. editör / M. Sen ; G. Bois ; M. Manna ; T. Arts. Istanbul Technical University, 2011. pp. 109-118 (9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings).

@inproceedings{d376521b643d41fa85a123c0a88c34b4,

title = "DNS of separated flows under the influence of wakes",

abstract = "The effect of wakes on a separated boundary layer over a flat plate is investigated by direct numerical simulation. The flow separates due to a strong adverse pressure gradient induced by suction along the upper simulation boundary. The forcing Strouhal number St = fLx/Uref of the wakes ranges from 0 to 2.9. Each forcing pulse generates three roll-up vortices, which originate near the separation point and convect with approximately half the local free-stream velocity. The separation and reattachment points vary with the forcing frequency, the size of the separated region is shortened significantly for high forcing frequencies, but no other significant variations of the mean boundary layer properties are observed unless the separation bubble is allowed to fully reform. The separation lengths of the periodic cases can be estimated from a single recovery experiment in which the forcing is suddenly removed.",

author = "Gungor, \{A. G.\} and Simens, \{M. P.\} and J. Jimenez",

note = "Publisher Copyright: Copyright {\textcopyright} 2011 Local Organising Commitee.; 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 ; Conference date: 21-03-2011 Through 25-03-2011",

year = "2011",

language = "English",

series = "9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings",

publisher = "Istanbul Technical University",

pages = "109--118",

editor = "M. Sen and G. Bois and M. Manna and T. Arts",

booktitle = "9th European Conference on Turbomachinery",

address = "Turkey",

}

Gungor, AG, Simens, MP & Jimenez, J 2011, DNS of separated flows under the influence of wakes. in M Sen, G Bois, M Manna & T Arts (eds), 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings. 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings, hac. 1, Istanbul Technical University, pp. 109-118, 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011, Istanbul, Turkey, 21/03/11.

DNS of separated flows under the influence of wakes. / Gungor, A. G.; Simens, M. P.; Jimenez, J.
9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings. ed. / M. Sen; G. Bois; M. Manna; T. Arts. Istanbul Technical University, 2011. p. 109-118 (9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings; Hac. 1).

Araştırma sonucu: Kitap/Rapor/Konferans Bildirisinde Bölüm › Konferans katkısı › bilirkişi

TY - GEN

T1 - DNS of separated flows under the influence of wakes

AU - Gungor, A. G.

AU - Simens, M. P.

AU - Jimenez, J.

PY - 2011

Y1 - 2011

N2 - The effect of wakes on a separated boundary layer over a flat plate is investigated by direct numerical simulation. The flow separates due to a strong adverse pressure gradient induced by suction along the upper simulation boundary. The forcing Strouhal number St = fLx/Uref of the wakes ranges from 0 to 2.9. Each forcing pulse generates three roll-up vortices, which originate near the separation point and convect with approximately half the local free-stream velocity. The separation and reattachment points vary with the forcing frequency, the size of the separated region is shortened significantly for high forcing frequencies, but no other significant variations of the mean boundary layer properties are observed unless the separation bubble is allowed to fully reform. The separation lengths of the periodic cases can be estimated from a single recovery experiment in which the forcing is suddenly removed.

AB - The effect of wakes on a separated boundary layer over a flat plate is investigated by direct numerical simulation. The flow separates due to a strong adverse pressure gradient induced by suction along the upper simulation boundary. The forcing Strouhal number St = fLx/Uref of the wakes ranges from 0 to 2.9. Each forcing pulse generates three roll-up vortices, which originate near the separation point and convect with approximately half the local free-stream velocity. The separation and reattachment points vary with the forcing frequency, the size of the separated region is shortened significantly for high forcing frequencies, but no other significant variations of the mean boundary layer properties are observed unless the separation bubble is allowed to fully reform. The separation lengths of the periodic cases can be estimated from a single recovery experiment in which the forcing is suddenly removed.

UR - https://www.scopus.com/pages/publications/84915819902

M3 - Conference contribution

AN - SCOPUS:84915819902

T3 - 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings

SP - 109

EP - 118

BT - 9th European Conference on Turbomachinery

A2 - Sen, M.

A2 - Bois, G.

A2 - Manna, M.

A2 - Arts, T.

PB - Istanbul Technical University

T2 - 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011

Y2 - 21 March 2011 through 25 March 2011

ER -

Gungor AG, Simens MP, Jimenez J. DNS of separated flows under the influence of wakes. In Sen M, Bois G, Manna M, Arts T, editörler, 9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings. Istanbul Technical University. 2011. p. 109-118. (9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings).

DNS of separated flows under the influence of wakes

Özet

Yayın serisi

???event.eventtypes.event.conference???

Bibliyografik not

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