This study assesses the capability of extended proper orthogonal decomposition (EPOD) and convolutional neural networks (CNNs) to reconstruct large-scale and very-large-scale motions (LSMs and VLSMs respectively) employing wall-shear-stress measurements in wall-bounded turbulent flows. Both techniques are used to reconstruct the instantaneous LSM evolution in the flow field as a combination of proper orthogonal decomposition (POD) modes, employing a limited set of instantaneous wall-shear-stress measurements. Due to the dominance of nonlinear effects, only CNNs provide satisfying results. Being able to account for nonlinearities in the flow, CNNs are shown to perform significantly better than EPOD in terms of both instantaneous flow-field estimation and turbulent-statistics reconstruction. CNNs are able to provide a more effective reconstruction performance employing more POD modes at larger distances from the wall and employing lower wall-measurement resolutions. Furthermore, the capability of tackling nonlinear features of CNNs results in estimation capabilities that are weakly dependent on the distance from the wall.
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December 2019
Research Article|
December 16 2019
Sensing the turbulent large-scale motions with their wall signature
Special Collection:
Special Topic on Passive and Active Control of Turbulent Flows
A. Güemes
;
A. Güemes
a)
Aerospace Engineering Research Group, Universidad Carlos III de Madrid
, Avenida de la Universidad 30, Leganés 28911, Spain
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S. Discetti
;
S. Discetti
Aerospace Engineering Research Group, Universidad Carlos III de Madrid
, Avenida de la Universidad 30, Leganés 28911, Spain
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A. Ianiro
A. Ianiro
Aerospace Engineering Research Group, Universidad Carlos III de Madrid
, Avenida de la Universidad 30, Leganés 28911, Spain
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a)
Electronic mail: guemes.turb@gmail.com
Note: This paper is part of the Special Topic on Passive and Active Control of Turbulent Flows.
Physics of Fluids 31, 125112 (2019)
Article history
Received:
September 16 2019
Accepted:
November 12 2019
Citation
A. Güemes, S. Discetti, A. Ianiro; Sensing the turbulent large-scale motions with their wall signature. Physics of Fluids 1 December 2019; 31 (12): 125112. https://doi.org/10.1063/1.5128053
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