THE DYNAMICS OF COHERENT STRUCTURES IN A TURBULENT WAKE PAST A SPHERE AT RE=3700

Fengrui Zhang; Yulia T. Peet

THE DYNAMICS OF COHERENT STRUCTURES IN A TURBULENT WAKE PAST A SPHERE AT RE=3700

Fengrui Zhang, Yulia T. Peet

Engineering, Ira A. Fulton Schools of (IAFSE)

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

1 Scopus citations

Abstract

The turbulent wake flow past a sphere at Re_D = 3700 is investigated via Direct Numerical Simulation (DNS). The characteristic motions in the wake flow, such as vortex shedding and bubble pumping are identified by the probes placed in the near wake with a dominating frequency of St = f_u∞/D = 0.22 and 0.004, respectively. The modal analysis is conducted in the wake area using Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). The vortex shedding and bubble pumping motions are also captured by the modal analysis. The results from POD and DMD show comparable patterns of both characteristic motions. For the bubble pumping motion, the dominating frequency of the corresponding POD mode is St = 0.004, while the DMD mode that is directly related to the separation bubble has the frequency of St = 0.009.

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

Conference

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

ASJC Scopus subject areas

Aerospace Engineering
Atmospheric Science

Cite this

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title = "THE DYNAMICS OF COHERENT STRUCTURES IN A TURBULENT WAKE PAST A SPHERE AT RE=3700",

abstract = "The turbulent wake flow past a sphere at ReD = 3700 is investigated via Direct Numerical Simulation (DNS). The characteristic motions in the wake flow, such as vortex shedding and bubble pumping are identified by the probes placed in the near wake with a dominating frequency of St = fu∞/D = 0.22 and 0.004, respectively. The modal analysis is conducted in the wake area using Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). The vortex shedding and bubble pumping motions are also captured by the modal analysis. The results from POD and DMD show comparable patterns of both characteristic motions. For the bubble pumping motion, the dominating frequency of the corresponding POD mode is St = 0.004, while the DMD mode that is directly related to the separation bubble has the frequency of St = 0.009.",

author = "Fengrui Zhang and Peet, {Yulia T.}",

note = "Funding Information: This work is supported by NSF CBET grants # 1707075 and 1944568. 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",

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language = "English (US)",

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T1 - THE DYNAMICS OF COHERENT STRUCTURES IN A TURBULENT WAKE PAST A SPHERE AT RE=3700

AU - Zhang, Fengrui

AU - Peet, Yulia T.

N1 - Funding Information: This work is supported by NSF CBET grants # 1707075 and 1944568. Publisher Copyright: © 2022 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022. All rights reserved.

PY - 2022

Y1 - 2022

N2 - The turbulent wake flow past a sphere at ReD = 3700 is investigated via Direct Numerical Simulation (DNS). The characteristic motions in the wake flow, such as vortex shedding and bubble pumping are identified by the probes placed in the near wake with a dominating frequency of St = fu∞/D = 0.22 and 0.004, respectively. The modal analysis is conducted in the wake area using Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). The vortex shedding and bubble pumping motions are also captured by the modal analysis. The results from POD and DMD show comparable patterns of both characteristic motions. For the bubble pumping motion, the dominating frequency of the corresponding POD mode is St = 0.004, while the DMD mode that is directly related to the separation bubble has the frequency of St = 0.009.

AB - The turbulent wake flow past a sphere at ReD = 3700 is investigated via Direct Numerical Simulation (DNS). The characteristic motions in the wake flow, such as vortex shedding and bubble pumping are identified by the probes placed in the near wake with a dominating frequency of St = fu∞/D = 0.22 and 0.004, respectively. The modal analysis is conducted in the wake area using Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). The vortex shedding and bubble pumping motions are also captured by the modal analysis. The results from POD and DMD show comparable patterns of both characteristic motions. For the bubble pumping motion, the dominating frequency of the corresponding POD mode is St = 0.004, while the DMD mode that is directly related to the separation bubble has the frequency of St = 0.009.

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M3 - Paper

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

Y2 - 19 July 2022 through 22 July 2022

ER -

THE DYNAMICS OF COHERENT STRUCTURES IN A TURBULENT WAKE PAST A SPHERE AT RE=3700

Abstract

Conference

ASJC Scopus subject areas

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