Department of Mechanical, Manufacturing & Biomedical Engineering

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Dr. Amitesh Roy

Dr. Amitesh Roy

Assistant Professor in Aviation Emission, Mechanical, Manuf & Biomedical Eng

Biography

Amitesh has a Ph.D. in Aerospace Engineering from IIT Madras, India, and received Post-Doctoral training at the University of Toronto, Canada. Amitesh explores tangible solutions for mitigating aviation's impact on climate through innovative lab-scale experiments promoting sustainable aviation research. At Toronto, he undertook the development of a unique "contrail-in-a-lab" facility for generating and exploring contrails under laboratory controlled conditions. During his Ph.D., he worked on theoretical aspects of highly turbulent premixed flames, unraveling the impact of turbulence scaling and intermittency on the dynamics of premixed flames. During this time, he also explored the phenomena of thermoacoustic instabilities in different gas turbine combustors. In particular, he developed a lean, premixed annular combustor for analyzing transverse instabilities. He also contributed to the understanding of phase transition from chaotic to high-amplitude limit cycle oscillations by introducing unique concepts of phase transition, percolation, and synchronization in quantifying transitions to thermoacoustic instabilities in laminar and turbulent gas turbine combustors.

Amitesh is a curiosity-driven and detail-oriented researcher who has successfully leveraged a strong background in applied physics to bring unique understanding to sustainable aviation research as reflected in multiple publications in reputed scientific journals.

Publications and Further Research Outputs

  • Roy, A., Sujith, R.I., Fractal dimension of premixed flames in intermittent turbulence, Combustion and Flame, 226, 2021, p412-418Journal Article, 2021, DOI
  • Samarjeet Singh and Amitesh Roy and Reeja K. V. and Asalatha Nair and Swetaprovo Chaudhuri and R. I. Sujith, Intermittency, Secondary Bifurcation and Mixed-Mode Oscillations in a Swirl-Stabilized Annular Combustor: Experiments and Modeling, Journal of Engineering for Gas Turbines and Power, 143, (5), 2021Journal Article, 2021, DOI
  • Roy, A., Premchand, C.P., Raghunathan, M., Krishnan, A., Nair, V., Sujith, R.I., Critical region in the spatiotemporal dynamics of a turbulent thermoacoustic system and smart passive control, Combustion and Flame, 226, 2021, p274-284Journal Article, 2021, DOI
  • Amitesh Roy, Sirshendu Mondal, Samadhan A. Pawar, R. I. Sujith, On the mechanism of open-loop control of thermoacoustic instability in a laminar premixed combustor, Journal of Fluid Mechanics, 884, 2020Journal Article, 2020, DOI
  • Roy, A., Sujith, R.I., Nonlinear flame response dependencies of a V-flame subjected to harmonic forcing and turbulence, Combustion and Flame, 2019, p101-119Journal Article, 2019, DOI
  • Ghosh, S., Pillai, R.H., Roy, A., Anand Murali, R., Vardhan, V., A simulation study of dust transport on an ancient amphitheatre: The Delphi example, Journal of Cultural Heritage, 24, 2017, p108-116Journal Article, 2017, DOI
  • Jahncke I.R., Mayigue C.C., Taddesse T.M., Groth C.P.T., Roy A., Sawanni R., Rajan Y.T., Chaudhuri S., Gulder O.L., FANS-Based Predictions of Jet-Regime Contrail Formation using a Two-Equation Soot/Ice Aerosol Transport Model, AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2026, 2026Conference Paper, 2026, DOI
  • Mayigue C.C., Jahncke I.R., Taddesse T.M., Groth C.P.T., Roy A., Sawanni R., Rajan Y.T., Chaudhuri S., Gulder O.L., Contrail Formation Simulation Via FANS-Based Turbulence Modelling Combined with Two-Equation Soot/Ice Particle Transport Modelling, AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025, 2025Conference Paper, 2025, DOI
  • Kushwaha A., Roy A., Chterev I., Boxx I., Sujith R.I., Coupled thermoacoustic interactions in hydrogen-enriched lean combustion, Experiments in Fluids, 65, (8), 2024Journal Article, 2024, DOI
  • Sudarsanan S., Roy A., Pavithran I., Tandon S., Sujith R.I., Emergence of order from chaos through a continuous phase transition in a turbulent reactive flow system, Physical Review E, 109, (6), 2024Journal Article, 2024, DOI
  • Singh S., Roy A., Dhadphale J.M., Chaudhuri S., Sujith R.I., Continuous and explosive synchronization transition in turbulent combustors, AIP Advances, 14, (6), 2024Journal Article, 2024, DOI
  • Singh S., Kumar Dutta A., Dhadphale J.M., Roy A., Sujith R.I., Chaudhuri S., Mean-field model of synchronization for open-loop, swirl controlled thermoacoustic system, Chaos, 33, (4), 2023Journal Article, 2023, DOI
  • Bhavi R.S., Pavithran I., Roy A., Sujith R.I., Abrupt transitions in turbulent thermoacoustic systems, Journal of Sound and Vibration, 547, 2023Journal Article, 2023, DOI
  • Roy A., Picardo J.R., Emerson B., Lieuwen T.C., Sujith R.I., Small-scale intermittency of premixed turbulent flames, Journal of Fluid Mechanics, 957, 2023Journal Article, 2023, DOI
  • Sahay A., Roy A., Pawar S.A., Sujith R.I., Dynamics of Coupled Thermoacoustic Oscillators under Asymmetric Forcing, Physical Review Applied, 15, (4), 2021Journal Article, 2021, DOI
  • Roy A., Singh S., Nair A., Chaudhuri S., Sujith R.I., Flame dynamics during intermittency and secondary bifurcation to longitudinal thermoacoustic instability in a swirl-stabilized annular combustor, Proceedings of the Combustion Institute, 38, (4), 2021, p5171 - 5180, p5171-5180Journal Article, 2021, DOI
  • Roy, A., Sawanni, R, Rajan, Y. T., Jahncke, I., Taddesse, T., Groth, C. P. T., Chaudhuri, S., Gulder, O. L., Effects of fuel and soot concentrations on the inception and development of contrails, Proceedings of the Combustion Institute, 2026Journal Article, 2026

Research Expertise

1. Sustainable aviation and emissions: Non-CO2 emissions; soot aerosol formation and particulate emissions; lean combustion technologies and NOx formations; fuel effects involving SAF, H2, biofuels, etc.; soot formation pathways; combustion noise and thermoacoustic instabilities.
2. Aviation induced cloudiness: contrails and cirrus clouds; volatile and non-volatile particulate emission, aerosol activation and growth; homogeneous and heterogeneous ice nucleation; non-equilibrium thermodynamics and phase transition; scalar mixing and low density jet dynamics.
3. Premixed combustion and turbulence: high Karlovitz number premixed flames; intermittency, dissipation and anomalous scaling; G-equation and Karder-Parisi-Zhang (KPZ) universality; laminar-turbulent transition.
4. Optical diagnostics: Rayleigh and Mie scattering; multi-angle light scattering and extinction; Laser-induced fluorescence; particle image velocimetry and flow anemometry; advanced microscopy techniques (TEM, SEM, FTIR).
5. Complex systems theory: non-linear dynamics, synchronization, complex networks, bifurcations, percolation, chaos, fractals and multifractals.

Recognition

  • Member of the Combustion Institute (Irish Section)