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{Brizzolara:2023:10.1016/j.euromechflu.2023.06.005,
author = {Brizzolara, S and Mollicone, J-P and van, Reeuwijk M and Holzner, M},
doi = {10.1016/j.euromechflu.2023.06.005},
journal = {European Journal of Mechanics - B/Fluids},
pages = {294--302},
title = {Entrainment at multi-scales in shear-dominated and Rayleigh–Taylor turbulence},
url = {http://dx.doi.org/10.1016/j.euromechflu.2023.06.005},
volume = {101},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A partially turbulent flow continuously incorporates irrotational fluid into the turbulent region, a phenomenon known as entrainment. Although entrainment locally acts at viscous scales, the thin interface separating the turbulent from the irrotational region is extremely convoluted, and twisted in such a way that renders the global entrainment flux scale-independent. Despite turbulent entrainment being widely recognized as a multi-scale process, the theoretical basis for quantifying the entrainment flux at multi-scales is lacking. In this paper we derive an equation that allows us to quantify the local entrainment velocity at multi-scales. This is done by defining the local entrainment velocity as the propagation speed of an iso-surface of filtered enstrophy relative to the coarse-grained velocity field, and using the filtered enstrophy budget to split the total velocity into its individual components, i.e. viscous, inviscid, baroclinic and sub-filter. The equation is used to investigate the entrainment at multi-scales in simulated turbulent mixing layers, where turbulence is sustained by either a mean shear or an unstable buoyancy gradient (Rayleigh–Taylor turbulence).
AU  - Brizzolara,S
AU  - Mollicone,J-P
AU  - van,Reeuwijk M
AU  - Holzner,M
DO  - 10.1016/j.euromechflu.2023.06.005
EP  - 302
PY  - 2023///
SN  - 0997-7546
SP  - 294
TI  - Entrainment at multi-scales in shear-dominated and Rayleigh–Taylor turbulence
T2  - European Journal of Mechanics - B/Fluids
UR  - http://dx.doi.org/10.1016/j.euromechflu.2023.06.005
UR  - http://hdl.handle.net/10044/1/106174
VL  - 101
ER  -
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