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{Fouxon:2018:10.1103/PhysRevFluids.3.064301,
author = {Fouxon, I and Schmidt, L and Ditlevsen, P and van, Reeuwijk M and Holzner, M},
doi = {10.1103/PhysRevFluids.3.064301},
journal = {Physical Review Fluids},
title = {Inhomogeneous growth of fluctuations of concentration of inertial particles in channel turbulence},
url = {http://dx.doi.org/10.1103/PhysRevFluids.3.064301},
volume = {3},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We study the growth of concentration fluctuations of weakly inertial particles in the turbulent channel flow starting with a smooth initial distribution. The steady-state concentration is singular and multifractal so the growth describes the increasingly rugged structure of the distribution. We demonstrate that inhomogeneity influences the growth of concentration fluctuations profoundly. For homogeneous turbulence the growth is exponential and is fully determined by Kolmogorov scale eddies.We derive lognormality of the statistics in this case. The growth exponents of the moments are proportional to the sum of Lyapunov exponents, which is quadratic in the small inertia of the particles. In contrast, for inhomogeneous turbulence the growth is linear in inertia. It involves correlations of inertial range and viscous scale eddies that turn the growth into a stretched exponential law with exponent three halves. We demonstrate using direct numerical simulations that the resulting growth rate can differ by orders of magnitude over channel height. This strong variation might have relevance in the planetary boundary layer.
AU  - Fouxon,I
AU  - Schmidt,L
AU  - Ditlevsen,P
AU  - van,Reeuwijk M
AU  - Holzner,M
DO  - 10.1103/PhysRevFluids.3.064301
PY  - 2018///
SN  - 2469-990X
TI  - Inhomogeneous growth of fluctuations of concentration of inertial particles in channel turbulence
T2  - Physical Review Fluids
UR  - http://dx.doi.org/10.1103/PhysRevFluids.3.064301
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000434022700001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/82934
VL  - 3
ER  -
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