Imperial College London
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Dr. Oliver Buxton

Faculty of Engineering, Department of Aeronautics

Reader in Experimental Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 5118o.buxton Website CV

 
 
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Location

 

213City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Beaumard:2019:10.1080/14685248.2019.1685095,
author = {Beaumard, P and Buxton, O and Keylock, CJ},
doi = {10.1080/14685248.2019.1685095},
journal = {Journal of Turbulence},
pages = {577--598},
title = {The importance of non-normal contributions to velocity gradient tensor dynamics for spatially developing, inhomogeneous, turbulent flows},
url = {http://dx.doi.org/10.1080/14685248.2019.1685095},
volume = {20},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We investigate the properties of the velocity gradient tensor for spatially evolving turbulent flows (a near-wake, two axisymmetric jets and a planar mixing layer). Emphasis is placed on the study of the normal and non-normal parts of the tensor. Non-normality plays a greater role in the dynamics than is observed for HIT and does so for all spatial locations examined. This implies a greater role for the deviatoric part of the pressure Hessian. Results for the wake flow, where we isolate the coherent part of the dynamics using a modal decomposition, clarify how these competing effects operate. Previous studies have shown the shape of the Q–R diagram (formed by the second and third invariants of the characteristic equation for the tensor) is approximately universal at small-scales for different flows. The non-normal dynamics are neglected in the Q–R approach but appear to differ significantly between flows.
AU  - Beaumard,P
AU  - Buxton,O
AU  - Keylock,CJ
DO  - 10.1080/14685248.2019.1685095
EP  - 598
PY  - 2019///
SN  - 1468-5248
SP  - 577
TI  - The importance of non-normal contributions to velocity gradient tensor dynamics for spatially developing, inhomogeneous, turbulent flows
T2  - Journal of Turbulence
UR  - http://dx.doi.org/10.1080/14685248.2019.1685095
UR  - https://www.tandfonline.com/doi/full/10.1080/14685248.2019.1685095
UR  - http://hdl.handle.net/10044/1/74369
VL  - 20
ER  -
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