Non-Kolmogorov scaling and dissipation laws in planar turbulent plume

2018 ◽  
Vol 30 (11) ◽  
pp. 115105 ◽  
Author(s):  
G. C. Layek ◽  
Sunita
Keyword(s):  
Turbulent Plume

The Swirling Turbulent Plume

1974 ◽  
Vol 41 (2) ◽  
pp. 337-342 ◽  
Author(s):  
J. P. Narain ◽  
M. S. Uberoi
Keyword(s):  
Surrounding Medium ◽  
Experimental Investigations ◽  
Swirl Ratio ◽  
Reynolds Stresses ◽  
Ambient Fluid ◽  
Densimetric Froude Number ◽  
Swirl Velocity ◽  
The Mean ◽  
Turbulent Plume ◽  
Integrated Conservation

An entrainment model for an axisymmetric buoyant swirling turbulent plume in a quiescent homogeneous density surrounding medium has been developed. The streamwise similarity of the mean axial velocity, swirl velocity, turbulent Reynolds stresses, and the density difference between the plume and the ambient fluid are assumed. Consistent with various integrated conservation equations, the entrainment is found to be a function of the Reynolds stress, the form of various similarity profiles, the local densimetric Froude number, and the swirl ratio of the swirling plume. While the swirl alone always increases the rate of entrainment across the boundaries of the plume, it also interacts with the buoyancy forces to cause a slight detrainment of the fluid from the plume. The numerical results for the decays of axial and swirling velocities and the spread of the jet agree reasonably well with the existing experimental investigations.

The contribution of turbulent plume dynamics to long-range spotting

2017 ◽  
Vol 26 (4) ◽  
pp. 317 ◽  
Author(s):  
William Thurston ◽  
Jeffrey D. Kepert ◽  
Kevin J. Tory ◽  
Robert J. B. Fawcett
Keyword(s):  
Transport Model ◽  
Fire Spread ◽  
Substantial Impact ◽  
Landing Position ◽  
Plume Dynamics ◽  
Large Eddy ◽  
Rapid Spread ◽  
Fire Front ◽  
Turbulent Plume ◽  
Physical Realism

Spotting can start fires up to tens of kilometres ahead of the primary fire front, causing rapid spread and placing immense pressure on suppression resources. Here, we investigate the dynamics of the buoyant plume generated by the fire and its ability to transport firebrands. We couple large-eddy simulations of bushfire plumes with a firebrand transport model to assess the effects of turbulent plume dynamics on firebrand trajectories. We show that plume dynamics have a marked effect on the maximum spotting distance and determine the amount of lateral and longitudinal spread in firebrand landing position. In-plume turbulence causes much of this spread and can increase the maximum spotting distance by a factor of more than 2 over that in a plume without turbulence in our experiments. The substantial impact of plume dynamics on the spotting process implies that fire spread models should include parametrisations of turbulent plume dynamics to improve their accuracy and physical realism.

Study on Realization Method of Multi-robot Active Olfaction in Turbulent Plume Environments

2009 ◽  
Vol 34 (10) ◽  
pp. 1281-1290 ◽  
Author(s):  
Qing-Hao MENG ◽  
Fei LI ◽  
Ming-Lu ZHANG ◽  
Ming ZENG ◽  
Xiao-Bo WEI
Keyword(s):  
Turbulent Plume ◽  
Multi Robot

Asymptotic approximations for swirling turbulent plume rising from circular sources

2021 ◽  
Vol 6 (9) ◽  
Author(s):  
Yuchen Dai ◽  
Alexander Klimenko ◽  
Yuanshen Lu ◽  
Kamel Hooman
Keyword(s):  
Asymptotic Approximations ◽  
Turbulent Plume
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