Imperial College London
Portrait Picture

Professor Maarten van Reeuwijk

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Urban Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 6059m.vanreeuwijk Website CV

 
 
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Assistant

 

Miss Rebecca Naessens +44 (0)20 7594 5990

 
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Location

 

331Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Neamtu-Halic:2020:10.1017/jfm.2020.414,
author = {Neamtu-Halic, MM and Krug, D and Mollicone, J-P and van, Reeuwijk M and Haller, G and Holzner, M},
doi = {10.1017/jfm.2020.414},
journal = {Journal of Fluid Mechanics},
pages = {1--24},
title = {Connecting the time evolution of the turbulence interface to coherent structures},
url = {http://dx.doi.org/10.1017/jfm.2020.414},
volume = {898},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The surface area of turbulent/non-turbulent interfaces (TNTIs) is continuously produced and destroyed via stretching and curvature/propagation effects. Here, the mechanisms responsible for TNTI area growth and destruction are investigated in a turbulent flow with and without stable stratification through the time evolution equation of the TNTI area. We show that both terms have broad distributions and may locally contribute to either production or destruction. On average, however, the area growth is driven by stretching, which is approximately balanced by destruction by the curvature/propagation term. To investigate the contribution of different length scales to these processes, we apply spatial filtering to the data. In doing so, we find that the averages of the stretching and the curvature/propagation terms balance out across spatial scales of TNTI wrinkles and this scale-by-scale balance is consistent with an observed scale invariance of the nearby coherent vortices. Through a conditional analysis, we demonstrate that the TNTI area production (destruction) is localized at the front (lee) edge of the vortical structures in the interface proximity. Finally, we show that while basic mechanisms remain the same, increasing stratification reduces the rates at which TNTI surface area is produced as well as destroyed. We provide evidence that this reduction is largely connected to a change in the multiscale geometry of the interface, which tends to flatten in the wall-normal direction at all active length scales of the TNTI.
AU  - Neamtu-Halic,MM
AU  - Krug,D
AU  - Mollicone,J-P
AU  - van,Reeuwijk M
AU  - Haller,G
AU  - Holzner,M
DO  - 10.1017/jfm.2020.414
EP  - 24
PY  - 2020///
SN  - 0022-1120
SP  - 1
TI  - Connecting the time evolution of the turbulence interface to coherent structures
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2020.414
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000542617300001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/connecting-the-time-evolution-of-the-turbulence-interface-to-coherent-structures/2E5BBE2111ED4F1DF796D329686919BF
UR  - http://hdl.handle.net/10044/1/83017
VL  - 898
ER  -
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