Imperial College London
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Professor Aimee S. Morgans

Faculty of Engineering, Department of Mechanical Engineering

Professor of Thermofluids
 
 
 
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Contact

 

+44 (0)20 7594 9975a.morgans

 
 
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Location

 

621City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hu:2022:10.1017/jfm.2022.467,
author = {Hu, X and Morgans, AS},
doi = {10.1017/jfm.2022.467},
journal = {Journal of Fluid Mechanics},
title = {Attenuation of the unsteady loading on a high-rise building using feedback control},
url = {http://dx.doi.org/10.1017/jfm.2022.467},
volume = {944},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The unsteady wind loading on high-rise buildings has the potential to influence stronglytheir structural performance in terms of serviceability, habitability and occupant comfort.This paper investigates numerically the flow structures around a canonical high-risebuilding immersed in an atmospheric boundary layer, using wall-resolved large eddysimulations. The switching between two vortex shedding modes is explored, and theinfluence of the atmospheric boundary layer on suppressing symmetric vortex sheddingis identified. It is shown that the antisymmetric vortex shedding mode is prevalent in thenear wake behind the building, with strong coherence between the periodic fluctuations ofthe building side force and the antisymmetric vortex shedding mode demonstrated. Twofeedback control strategies, exploiting this idea, are designed to alleviate the aerodynamicside-force fluctuations, using pressure sensing on just a single building wall. The sensorresponse to synthetic jet actuation along the two ‘leading edges’ of the building ischaracterised using system identification. Both the designed linear controller and the leastmean square adaptive controller attenuate successfully the side-force fluctuations whenimplemented in simulations. The linear controller exhibits a better performance, and itseffect on the flow field is to delay the formation of dominant vortices and increase theextent of the recirculation region. Feedback control that requires a smaller sensing area isthen explored, with a comparable control effect achieved in the attenuation of the unsteadyloading. This study could motivate future attempts to understand and control the unsteadyloading of a high-rise building exposed to oncoming wind variations.
AU  - Hu,X
AU  - Morgans,AS
DO  - 10.1017/jfm.2022.467
PY  - 2022///
SN  - 0022-1120
TI  - Attenuation of the unsteady loading on a high-rise building using feedback control
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2022.467
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/attenuation-of-the-unsteady-loading-on-a-highrise-building-using-feedback-control/4A3E89EBF174454D349B90722D253DF4
UR  - http://hdl.handle.net/10044/1/98135
VL  - 944
ER  -
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