Imperial College London
Alternate

Dr John Craske

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 9702john.craske07 Website

 
 
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Assistant

 

Miss Rebecca Naessens +44 (0)20 7594 5990

 
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Location

 

328BSkempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Van:2016:10.1103/PhysRevFluids.1.074301,
author = {Van, Reeuwijk M and sallizoni, P and Hunt, GR and Craske, J},
doi = {10.1103/PhysRevFluids.1.074301},
journal = {Physical Review Fluids},
title = {Turbulent transport and entrainment in jets and plumes: A DNS study},
url = {http://dx.doi.org/10.1103/PhysRevFluids.1.074301},
volume = {1},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present a direct numerical simulation (DNS) data set for a statistically axisymmetric turbulent jet, plume, and forced plume in a domain of size 40r0×40r0×60r0, where r0 is the source diameter. The data set supports the validity of the Priestley-Ball entrainment model in unstratified environments (excluding the region near the source) [Priestley and Ball, Q. J. R. Meteor. Soc. 81, 144 (1955)], which is corroborated further by the Wang-Law and Ezzamel et al. experimental data sets [Wang and Law, J. Fluid Mech. 459, 397 (2002); Ezzamel et al., J. Fluid Mech. 765, 576 (2015)], the latter being corrected for a small but influential coflow that affected the statistics. We show that the second-order turbulence statistics in the core region of the jet and the plume are practically indistinguishable from each other, although there are significant differences near the plume edge. The DNS data indicate that the turbulent Prandtl number is about 0.7 for both jets and plumes. For plumes, this value is a result of the difference in the ratio of the radial turbulent transport of radial momentum and buoyancy. For jets, however, the value originates from a different spread of the buoyancy and velocity profiles, in spite of the fact that the ratio of radial turbulent transport terms is approximately unity. The DNS data do not show any evidence of similarity drift associated with gradual variations in the ratio of buoyancy profile to velocity profile widths.
AU  - Van,Reeuwijk M
AU  - sallizoni,P
AU  - Hunt,GR
AU  - Craske,J
DO  - 10.1103/PhysRevFluids.1.074301
PY  - 2016///
SN  - 2469-990X
TI  - Turbulent transport and entrainment in jets and plumes: A DNS study
T2  - Physical Review Fluids
UR  - http://dx.doi.org/10.1103/PhysRevFluids.1.074301
UR  - http://hdl.handle.net/10044/1/42370
VL  - 1
ER  -
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