Imperial College London
Alternate

ProfessorGeorgePapadakis

Faculty of Engineering, Department of Aeronautics

Professor of Aerodynamics
 
 
 
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Contact

 

+44 (0)20 7594 5080g.papadakis

 
 
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Location

 

331City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Schlander:2024:10.1017/jfm.2024.290,
author = {Schlander, RK and Rigopoulos, S and Papadakis, G},
doi = {10.1017/jfm.2024.290},
title = {Resolvent analysis of turbulent flow laden with low-inertia particles},
url = {http://dx.doi.org/10.1017/jfm.2024.290},
year = {2024}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - We extend the resolvent framework to two-phase flows with low-inertia particles. The particle velocities are modelled using the equilibrium Eulerian model. We analyse the turbulent flow in a vertical pipe with Reynolds number of (based on diameter and bulk velocity), for Stokes numbers, Froude numbers and (gravity omitted). The governing equations are written in input-output form and a singular value decomposition is performed on the resolvent operator. As for single-phase flows, the operator is low rank around the critical layer, and the true response can be approximated using one singular vector. Even with a crude forcing model, the formulation can predict physical phenomena observed in Lagrangian simulations, such as particle clustering and gravitational effects. Increasing the Stokes number shifts the predicted concentration spectra to lower wavelengths; this shift also appears in the direct numerical simulation spectra and is due to particle clustering. When gravity is present, there are two critical layers, one for the concentration field, and one for the velocity field. For upward flow, the peak of concentration fluctuations shifts closer to the wall, in agreement with the literature. We explain this with the aid of the different locations of the two critical layers. Finally, the model correctly predicts the interaction of near-wall vortices with particle clusters. Overall, the resolvent operator provides a useful framework to explain and interpret many features observed in Lagrangian simulations. The application of the resolvent framework to higher flows in combination with Lagrangian simulations is also discussed.
AU  - Schlander,RK
AU  - Rigopoulos,S
AU  - Papadakis,G
DO  - 10.1017/jfm.2024.290
PY  - 2024///
SN  - 0022-1120
TI  - Resolvent analysis of turbulent flow laden with low-inertia particles
UR  - http://dx.doi.org/10.1017/jfm.2024.290
ER  -
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