THEORETICAL AND NUMERICAL ANALYSES OF UNIFORM BLOWING AND SUCTION IN TURBULENT PLANE COUETTE FLOW

Yusuke Nabae; Koji Fukagata

THEORETICAL AND NUMERICAL ANALYSES OF UNIFORM BLOWING AND SUCTION IN TURBULENT PLANE COUETTE FLOW

Department of Mechanical Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

We theoretically and numerically investigate the control effect of uniform blowing/suction (UB/US) in a turbulent plane Couette flow under a constant velocity difference (CVD) condition in terms of the net energy saving. The semi-theoretical upper bound of the ratio between UB/US amplitude and the wall velocity, V_w/U_w, for the net energy saving is about 0.45% at very low Reynolds numbers, i.e., Re_w ∼ 10³, while it is less than 0.05% at practically high Reynolds numbers, i.e., Re_w ∼ 10⁹-10¹⁰. According to the present simulations, however, it is found that the amplitude of V_w/U_w ≤ 0.1%, (i.e., the amplitude often used for external flows) is too small to obtain substantial control effects in this flow configuration, while the larger amplitude, i.e., V_w/U_w ≥ 0.3%, results in a negative net energy saving due to the drastic enhancement of the contribution from the blowing and suction.

Original language	English
Publication status	Published - 2022
Event	12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022 - Osaka, Virtual, Japan Duration: 2022 Jul 19 → 2022 Jul 22

Conference

Conference	12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022
Country/Territory	Japan
City	Osaka, Virtual
Period	22/7/19 → 22/7/22

ASJC Scopus subject areas

Aerospace Engineering
Atmospheric Science

Cite this

@conference{c1bccd75d81844c18d8099c3a0a4ce68,

title = "THEORETICAL AND NUMERICAL ANALYSES OF UNIFORM BLOWING AND SUCTION IN TURBULENT PLANE COUETTE FLOW",

abstract = "We theoretically and numerically investigate the control effect of uniform blowing/suction (UB/US) in a turbulent plane Couette flow under a constant velocity difference (CVD) condition in terms of the net energy saving. The semi-theoretical upper bound of the ratio between UB/US amplitude and the wall velocity, Vw/Uw, for the net energy saving is about 0.45% at very low Reynolds numbers, i.e., Rew ∼ 103, while it is less than 0.05% at practically high Reynolds numbers, i.e., Rew ∼ 109-1010. According to the present simulations, however, it is found that the amplitude of Vw/Uw ≤ 0.1%, (i.e., the amplitude often used for external flows) is too small to obtain substantial control effects in this flow configuration, while the larger amplitude, i.e., Vw/Uw ≥ 0.3%, results in a negative net energy saving due to the drastic enhancement of the contribution from the blowing and suction.",

author = "Yusuke Nabae and Koji Fukagata",

note = "Funding Information: Authors are grateful to Drs S. Obi, K. Ando, and T. Kawata (Keio University) for fruitful discussions. This work was supported through JSPS KAKENHI grant No. 18H03758 and 21H05007 by Japan Society for the Promotion of Science. Publisher Copyright: {\textcopyright} 2022 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022. All rights reserved.; 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022 ; Conference date: 19-07-2022 Through 22-07-2022",

year = "2022",

language = "English",

}

TY - CONF

T1 - THEORETICAL AND NUMERICAL ANALYSES OF UNIFORM BLOWING AND SUCTION IN TURBULENT PLANE COUETTE FLOW

AU - Nabae, Yusuke

AU - Fukagata, Koji

N1 - Funding Information: Authors are grateful to Drs S. Obi, K. Ando, and T. Kawata (Keio University) for fruitful discussions. This work was supported through JSPS KAKENHI grant No. 18H03758 and 21H05007 by Japan Society for the Promotion of Science. Publisher Copyright: © 2022 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022. All rights reserved.

PY - 2022

Y1 - 2022

N2 - We theoretically and numerically investigate the control effect of uniform blowing/suction (UB/US) in a turbulent plane Couette flow under a constant velocity difference (CVD) condition in terms of the net energy saving. The semi-theoretical upper bound of the ratio between UB/US amplitude and the wall velocity, Vw/Uw, for the net energy saving is about 0.45% at very low Reynolds numbers, i.e., Rew ∼ 103, while it is less than 0.05% at practically high Reynolds numbers, i.e., Rew ∼ 109-1010. According to the present simulations, however, it is found that the amplitude of Vw/Uw ≤ 0.1%, (i.e., the amplitude often used for external flows) is too small to obtain substantial control effects in this flow configuration, while the larger amplitude, i.e., Vw/Uw ≥ 0.3%, results in a negative net energy saving due to the drastic enhancement of the contribution from the blowing and suction.

AB - We theoretically and numerically investigate the control effect of uniform blowing/suction (UB/US) in a turbulent plane Couette flow under a constant velocity difference (CVD) condition in terms of the net energy saving. The semi-theoretical upper bound of the ratio between UB/US amplitude and the wall velocity, Vw/Uw, for the net energy saving is about 0.45% at very low Reynolds numbers, i.e., Rew ∼ 103, while it is less than 0.05% at practically high Reynolds numbers, i.e., Rew ∼ 109-1010. According to the present simulations, however, it is found that the amplitude of Vw/Uw ≤ 0.1%, (i.e., the amplitude often used for external flows) is too small to obtain substantial control effects in this flow configuration, while the larger amplitude, i.e., Vw/Uw ≥ 0.3%, results in a negative net energy saving due to the drastic enhancement of the contribution from the blowing and suction.

UR - http://www.scopus.com/inward/record.url?scp=85143813693&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85143813693&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:85143813693

T2 - 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022

Y2 - 19 July 2022 through 22 July 2022

ER -

THEORETICAL AND NUMERICAL ANALYSES OF UNIFORM BLOWING AND SUCTION IN TURBULENT PLANE COUETTE FLOW

Abstract

Conference

ASJC Scopus subject areas

Other files and links

Fingerprint

Cite this