Imperial College London

ProfessorSpencerSherwin

Faculty of EngineeringDepartment of Aeronautics

Professor of Computational Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 5052s.sherwin Website

 
 
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Location

 

313BCity and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Sharma:2010:10.1007/s00162-010-0183-9,
author = {Sharma, AS and Abdessemed, N and Sherwin, SJ and Theofilis, V},
doi = {10.1007/s00162-010-0183-9},
journal = {Theoretical and Computational Fluid Dynamics},
title = {Transient growth mechanisms of low Reynolds number flow over a low-pressure turbine blade},
url = {http://dx.doi.org/10.1007/s00162-010-0183-9},
year = {2010}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - A direct transient growth analysis for three-dimensional perturbations to flow past a periodic array of T-106/300 low-pressure turbine fan blades is presented. The methodology is based on a singular value decomposition of the flow evolution operator, linearised about a steady or periodic base flow. This analysis yields the optimal growth modes. Previous work on global mode stability analysis of this flow geometry showed the flow is asymptotically stable, indicating a non-modal explanation of transition may be more appropriate. The present work extends previous investigations into the transient growth around a steady base flow, to higher Reynolds numbers and periodic base flows. It is found that the notable transient growth of the optimal modes suggests a plausible route to transition in comparison to modal growth for this configuration. The spatial extent and localisation of the optimal modes is examined and possible physical triggering mechanisms are discussed. It is found that for longer times and longer spanwise wavelengths, a separation in the shear layer excites the wake mode. For shorter times and spanwise wavelengths, smaller growth associated with excitation of the near wake are observed.
AU - Sharma,AS
AU - Abdessemed,N
AU - Sherwin,SJ
AU - Theofilis,V
DO - 10.1007/s00162-010-0183-9
PY - 2010///
SN - 0935-4964
TI - Transient growth mechanisms of low Reynolds number flow over a low-pressure turbine blade
T2 - Theoretical and Computational Fluid Dynamics
UR - http://dx.doi.org/10.1007/s00162-010-0183-9
UR - http://www2.imperial.ac.uk/ssherw/spectralhp/papers/TCFD-ShAbShTh09.pdf
ER -