Imperial College London
Portrait Picture

Professor Maarten van Reeuwijk

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Urban Fluid Mechanics
 
 
 
//

Contact

 

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

 
 
//

Assistant

 

Miss Rebecca Naessens +44 (0)20 7594 5990

 
//

Location

 

331Skempton BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Krug:2017:10.1017/jfm.2017.245,
author = {Krug, D and Holzner, M and Marusic, I and Van, Reeuwijk M},
doi = {10.1017/jfm.2017.245},
journal = {Journal of Fluid Mechanics},
pages = {R3--1--R3--12},
title = {Fractal scaling of the turbulence interface in gravity currents},
url = {http://dx.doi.org/10.1017/jfm.2017.245},
volume = {820},
year = {2017}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - It was previously observed by Krug et al. (J. Fluid Mech., vol. 765, 2015, pp. 303–324) that the surface area  of the turbulent/non-turbulent interface (TNTI) in gravity currents decreases with increasing stratification, significantly reducing the entrainment rate. Here, we consider the multiscale properties of this effect using direct numerical simulations of temporal gravity currents with different gradient Richardson numbers  . Our results indicate that the reduction of  is caused by a decrease of the fractal scaling exponent  , while the scaling range remains largely unaffected. We further find that convolutions of the TNTI are characterized by different length scales in the streamwise and wall-normal directions, namely the integral scale  and the shear scale =1/2/ (formed using the mean shear  and the turbulent kinetic energy   ) respectively. By recognizing that the anisotropy implied by the different scaling relations increases with increasing  , we are able to model the  dependence of  in good agreement with the data.
AU  - Krug,D
AU  - Holzner,M
AU  - Marusic,I
AU  - Van,Reeuwijk M
DO  - 10.1017/jfm.2017.245
EP  - 1
PY  - 2017///
SN  - 0022-1120
SP  - 3
TI  - Fractal scaling of the turbulence interface in gravity currents
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2017.245
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/fractal-scaling-of-the-turbulence-interface-in-gravity-currents/1141049D31AACC2583EF3DC8E28DEF58
UR  - http://hdl.handle.net/10044/1/48027
VL  - 820
ER  -
Download