Imperial College London
Professor John Christos Vassilicos

ProfessorJohn ChristosVassilicos

Faculty of Engineering, Department of Aeronautics

Visiting Professor
 
 
 
//

Contact

 

+44 (0)20 7594 5137j.c.vassilicos

 
 
//

Assistant

 

Miss Jackie O'Neill +44 (0)20 7594 5079

 
//

Location

 

CAGB 314City and Guilds BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Alves:2017:10.1017/jfm.2017.390,
author = {Alves, Portela and Papadakis, G and Vassilicos},
doi = {10.1017/jfm.2017.390},
journal = {Journal of Fluid Mechanics},
pages = {315--352},
title = {The turbulence cascade in the near wake of a square prism},
url = {http://dx.doi.org/10.1017/jfm.2017.390},
volume = {825},
year = {2017}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present a study of the turbulence cascade on the centreline of an inhomogeneous and anisotropic near-field turbulent wake generated by a square prism at a Reynolds number of using the Kármán–Howarth–Monin–Hill equation. This is the fully generalised scale-by-scale energy balance which, unlike the Kármán–Howarth equation, does not require homogeneity or isotropy assumptions. Our data are obtained from a direct numerical simulation and therefore enable us to access all of the processes involved in this energy balance. A significant range of length scales exists where the orientation-averaged nonlinear interscale transfer rate is approximately constant and negative, indicating a forward turbulence cascade on average. This average cascade consists of coexisting forward and inverse cascade behaviours in different scale-space orientations. With increasing distance from the prism but within the near field of the wake, the orientation-averaged nonlinear interscale transfer rate tends to be approximately equal to minus the turbulence dissipation rate even though all of the inhomogeneity-related energy processes in the scale-by-scale energy balance are significant, if not equally important. We also find well-defined near energy spectra in the streamwise direction, in particular at a centreline position where the inverse cascade behaviour occurs for streamwise oriented length scales.
AU  - Alves,Portela
AU  - Papadakis,G
AU  - Vassilicos
DO  - 10.1017/jfm.2017.390
EP  - 352
PY  - 2017///
SN  - 1469-7645
SP  - 315
TI  - The turbulence cascade in the near wake of a square prism
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2017.390
UR  - http://hdl.handle.net/10044/1/48841
VL  - 825
ER  -
Download