Publications

Updated on: 12th June 2020

Review Papers

  1. Sujith, R. I., Unni, V. R.: Dynamical systems and complex systems theory to study unsteady combustion, An invited review in Proceedings of the Combustion Institute, 2020 (yet to appear)

  2. Sujith, R. I., Unni, V. R.: Complex system approach to investigate and mitigate thermoacoustic Instability in turbulent combustors, An invited review in Physics of Fluids, 2020 (in Press)

Preprints

  1. Unni, V. R., Chaudhuri, S., Law, C. K., and Saha, A.: A cellular automata model for expanding turbulent flames, 2020

  2. Chaudhuri, S., Basu, S., Kabi, P., Unni, V. R., and Saha, A.: Modeling ambient temperature and relative humidity sensitivity of respiratory droplets and their role in determining growth rate of Covid-19 outbreaks, arXiv:2004.10929, 2020

  3. Pavithran, I., Unni, V. R., Varghese, A. J., Sujith, R. I., Saha, A., Marwan, N., and Kurths, J.: “Universality in spectral condensation”, arXiv:2004.10585, 2020

Journal Papers

  1. Weng, Y., Unni, V. R., Sujith, R. I., and Saha A.: “Synchronization framework for modelling transition to thermoacoustic instability in laminar combustors”, Nonlinear Dynamics, 2020 (in Press)

  2. Pavithran, I., Unni, V. R., Varghese, A. J., Sujith, R. I., Saha, A., Marwan, N., and Kurths, J.: “Universality in the emergence of oscillatory instabilities in turbulent flows”, EPL (Europhysics Letters) 129(2), 2020

  3. Raghunathan, Manikandan, George, N. B., Unni, V. R., P. R. Midhun, K. V. Reeja, and Sujith, R. I.: “Multifractal analysis of flame dynamics during transition to thermoacoustic instability in a turbulent combustor”, Journal of Fluid Mechanics 888, 2020

  4. Premchand, C. P., George, N. B., Raghunathan, M., Unni, V. R., Sujith, R. I. , and Nair, V.: “Lagrangian Analysis of Flame Dynamics in the Flow Field of a Bluff Body Stabilized Combustor”, Journal of Engineering for Gas Turbines and Power 142, 2020

  5. Krishnan, Abin, R. Manikandan, P. R. Midhun, K. V. Reeja, Unni, V. R., Sujith, R. I., Marwan, N., and Kurths, J.: “Mitigation of oscillatory instability in turbulent reactive flows: A novel approach using complex networks”, EPL (Europhysics Letters) 128, 2019

  6. Kasthuri, P., Unni, V. R., and Sujith, R. I.: “Bursting and mixed mode oscillations during the transition to limit cycle oscillations in a matrix burner”, Chaos 29 (4), 2019

  7. Unni, V. R., Gopalakrishnan, E. A., Syamkumar, K. S., Sujith, R. I. , Surovyatkina, E., and Kurths, J.: “Interplay between random fluctuations and rate dependent phenomena at slow passage to limit-cycle oscillations in a bistable thermoacoustic system”, Chaos 29 (3), 2019

  8. Premchand C. P., George, N. B., Manikandan, R., Unni, V. R., Sujith, R. I. , and Nair, V.: “Lagrangian analysis of intermittent sound sources in the flow-field of a bluff-body stabilized combustor”, Physics of Fluids 31 (2), 2019

  9. Godavarthi, V., Pawar, S. A., Unni, V. R., Sujith, R. I., Marwan, N., and Kurths, J.: “Coupled interaction between unsteady flame dynamics and acoustic field in a turbulent combustor”, Chaos 28 (11), 2018

  10. Unni, V. R., Chaudhuri, S., and Sujith, R. I.: “Flame blowout: Transition to an absorb- ing state”, Chaos 28 (11), 2018

  11. Akshay S., P. Induja, Unni, V. R., and Sujith, R. I.: “Predicting the Amplitude of Limit Cycle Oscillations in Thermoacoustic Systems with Vortex Shedding”, AIAA Journal 56 (9), 2018

  12. Unni, V. R., Abin Krishnan, George, N. B., R. Manikandan, N. Marwan, Sujith, R. I., and Kurths, J.: “On the emergence of critical regions at the onset of thermoacoustic instability in a turbulent combustor”, Chaos 28, 2018

  13. George, N. B., Unni, V. R., R. Manikandan, and Sujith, R. I.: “Pattern formation during transition from combustion noise to thermoacoustic instability via intermittency”, Journal of Fluid Mechanics 849, 2018

  14. George, N. B., Unni, V. R., R. Manikandan, and Sujith, R. I.: “Spatio-temporal dynamics during the transition to thermoacoustic instability: effect of varying turbulence intensities”, International Journal of Spray and Combustion Dynamics 10 (4), 2018

  15. Samadhan, A. P., Seshadri, A., Unni, V. R., and Sujith, R. I.: “Thermoacoustic instabil- ity as mutual synchronization between the acoustic field of the confinement and turbulent reactive flow”, Journal of Fluid Mechanics 827, 2017

  16. Vedasri, G., Unni, V. R., Gopalakrishnan, E. A., and Sujith, R. I.: “Recurrence networks to study dynamical transitions in a turbulent combustor”, Chaos 27 (6), 2017

  17. Sirshendu M., Unni, V. R., and Sujith, R. I.: “Onset of thermoacoustic instability in turbulent combustors: An emergence of synchronized periodicity through formation of chimera-like states”, Journal of Fluid Mechanics 811, 2017

  18. Unni, V. R. and Sujith, R. I.: “Flame dynamics during Intermittency in turbulent combustor”, Proceedings of the Combustion Institute 36 (3), 2016

  19. Harshal A., Unni, V. R., Akhil, K. T., Ravi, N. T., Iqbal, S. Md., Pesala, B., and Sujith, R. I.: “Compact standing wave thermoacoustic generator for power conversion applications”, Applied Acoustics 09, 2016

  20. Unni, V. R., Yogesh Prasaad, M. S., Ravi, N. T., Iqbal, S. Md., Pesala, B., and Sujith, R. I.: “Experimental investigation of bifurcations in a thermoacoustic engine”, International Journal of Spray and Combustion Dynamics 06, 2015

  21. Unni, V. R., Mukhopadhyay, A., and Sujith, R. I.: “Online detection of impending insta- bility in a combustion system using tools from symbolic time series analysis”, International Journal of Spray and Combustion Dynamics 08, 2015

  22. Unni, V. R. and Sujith, R. I.: Multifractal characteristics of combustor dynamics close to lean blowout. Journal of Fluid Mechanics 12, 2015


Conference Papers

  1. Liu, Z., Unni, V. R., Chaudhuri, S., Law, C. K., and Saha, A.: “Local Statistics of Laminar Expanding Flames Subjected to Darrieus-Landau Instability, Accepted for pre- sentation in 38th International Symposium on Combustion, Adelaide, Australia

  2. Sujith, R. I., Unni, V. R.: “Dynamical systems and complex systems theory to study unsteady combustion”, a topical review to be presented in 38th International Symposium on Combustion, Adelaide, Australia

  3. Braun, T., Marwan, N., Unni, V. R., Sujith, R. I., and Kurths, J.: “Detection of dynam- ical regime transitions with lacunarity as a multiscale recurrence quantification measure”, EGU General Assembly, 2020

  4. Premchand, C. P., George, N. B., Raghunathan M., Unni, V. R., Sujith, R. I., and Nair V.: “Lagrangian Saddle Point Analysis in the Flow-Field of a Bluff-Body Stabilized Combustor”, Turbo Expo: Power for Land, Sea, and Air ASME, 2019

  5. Unni, V. R. and Saha, A.: “A Population Dynamics Model for Expanding Turbulent Flames”, National Combustion Meeting, Pasadena, March 2019

  6. Seshadri A., P. Induja, Unni, V. R., and Sujith, R. I.: “Predicting the Amplitude of Limit Cycle Oscillations in Thermoacoustic Systems with Vortex Shedding”, AIAA Aerospace Sciences Meeting, 2018

  7. George, N. B., Unni, V. R., Manikandan, R., and Sujith, R. I.: “Effect of Uniform and Non-Uniform Turbulent Intensity on Transition to Thermoacoustic Instability”, AIAA Aerospace Sciences Meeting, 2018

  8. George, N. B., Unni, V. R., Manikandan, R., and Sujith, R. I.: “Effect of varying turbulence intensity on thermoacoustic instability in a partially premixed combustor”, 23rd International Congress on Sound and Vibration, Athens, Greece, 2016

  9. Unni, V. R. and Sujith, R. I.: “Flame dynamics during Intermittency in turbulent combustor”, 36th International Symposium on Combustion, Seol, South Korea, July 2016

  10. Unni, V. R. and Sujith, R. I.: “Precursors to blowout in a turbulent combustor based on recurrence quantification”, 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, USA, July 2016

  11. Unni, V. R. and Sujith, R. I.: “A unified framework to describe dynamics of thermoa- coustic instability and blowout in a turbulent combustor”, 23rd International Congress on Sound and Vibration, Florence, Italy, July 2015

  12. Unni, V. R. and Sujith, R. I.: “Multifractal characterization of combustion dynamics”,

  13. 51st AIAA/SAE/ASEE Joint Propulsion Conference, Orlando, USA, Sept. 2015

  14. Unni, V. R., Prasaad, Y. M. S., Ravi, N. T., Iqbal, S. Md., Pesala, B., and Sujith,

  15. R. I.: “Experimental Investigation of Bifurcations in a Thermoacoustic Engine”, Interna- tional Summer School and Workshop on Non-Normal and Nonlinear Effects in Aero and Thermoacoustics, Munich, Germany, Dec. 2013

  16. Unni, V. R., Prasaad, Y. M. S., Ravi, N. T., Iqbal, S. Md., Pesala, B., and Sujith, R. I.: “Thermoacoustic Power Generator: Compact Solar Thermal Solution for Decentralized Applications”, TAPSUN Conference, New Delhi, India, Dec. 2012


Patents

  1. Induja P., Unni, V. R., A. J. Varghese, K. Praveen, Sujith, R. I., “System and Method for determining oscillatory instabilities in fluid mechanical devices”, WO2020021565A1, India Provisional Patent Reference Number: 201841027977 filed on 25 July, 2018

  2. Induja P., Unni, V. R., Sujith, R. I.: “Patent of addition to the patent, System and method for predetermining the onset of impending oscillatory instabilities in practical devices”, US9804054B2, India Provisional Patent Reference Number: 201843027574 filed on 23 July, 2018

  3. Unni, V. R., Induja P., Sujith R. I.: “Patent of addition to the patent, System and method for detecting precursors to control blowout in combustion systems”, WO2015068176A2, India Provisional Patent Reference Number: 201841026479 filed on 16 July, 2018

  4. Unni, V. R., Sujith, R. I., Krishnan, A., Marwan, N., Kurths, J.: “System and method for optimizing passive control of oscillatory instabilities in turbulent flows”, United States Patent Application: 20190264916, India Provisional Patent Reference Number: 201841007455 filed on 27 Feb., 2018

  5. Murugesan, M., Unni, V. R., Nair, V., Sujith, R. I.: “Devices and methods for early pre- diction of impending instabilities of a system”, WO2015166396A1, PCT/ IB2015/053049, Published: 05 Nov, 2015, Priority date: 29 April, 2014

  6. Unni, V. R., Nair, V., Sujith, R. I., Mukhopadhyay, A.: “System and method for control- ling oscillatory instabilities in a device”, WO2015083186A2, PCT/IN2014/ 000750, Pub- lished: Jun 11, 2015, Priority date: 4 Dec., 2013

  7. Unni, V. R., Nair, V., Sujith, R. I.: “System and method for detecting precursors to con- trol blowout in combustion systems”, WO2015068176A2, PCT/IN2014/0714, Published: 14 May, 2015, Priority date: Nov 8, 2013