Imperial College London
Alternate

ProfessorGrahamHughes

Faculty of Engineering, Department of Civil and Environmental Engineering

Chair in Environmental Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 9701g.hughes

 
 
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Location

 

332Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Craske:2019:10.1017/jfm.2019.199,
author = {Craske, J and Hughes, G},
doi = {10.1017/jfm.2019.199},
journal = {Journal of Fluid Mechanics},
title = {On the robustness of emptying filling boxes to sudden changes in the wind},
url = {http://dx.doi.org/10.1017/jfm.2019.199},
volume = {868},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We determine the smallest instantaneous increase in the strength of an opposing windthat  is  necessary  to  permanently  reverse  the  forward  displacement  flow  that  is  drivenby a two-layer thermal stratification. With an interpretation in terms of the flow’s ener-getics, the results clarify why the ventilation of a confined space with a stably-stratifiedbuoyancy field is less susceptible to being permanently reversed by the wind than theventilation of a space with a uniform buoyancy field. For large opposing wind strengthswe derive analytical upper and lower bounds for the system’s marginal stability, which ex-hibit a good agreement with the exact solution, even for modest opposing wind strengths.The work extends a previous formulation of the problem (Lishman & Woods 2009,Build-ing  and  Env.44, pp. 666-673) by accounting for the transient dynamics and energeticsassociated with the homogenisation of the interior, which prove to play a significant rolein buffering temporal variations in the wind.
AU  - Craske,J
AU  - Hughes,G
DO  - 10.1017/jfm.2019.199
PY  - 2019///
SN  - 0022-1120
TI  - On the robustness of emptying filling boxes to sudden changes in the wind
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2019.199
UR  - http://hdl.handle.net/10044/1/68108
VL  - 868
ER  -
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