Imperial College London

Dr Maarten van Reeuwijk

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Reader in Environmental Fluid Mechanics
 
 
 
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Contact

 

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

 
 
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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{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},
title = {Fractal scaling of the turbulence interface in gravity currents},
url = {http://dx.doi.org/10.1017/jfm.2017.245},
volume = {820},
year = {2017}
}

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 (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
PY - 2017///
SN - 1469-7645
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 - http://hdl.handle.net/10044/1/48027
VL - 820
ER -