Publications

[1] R. Vishnu, M. Sharma, A. Sameen, ”Effect of heating on topology of vortex breakdown in Vogel-Escudier flow”, Physics of Fluids, 2021. Featured as Editor’s Pick.
This numerical work describes the velocity perturbation structures and plumes to distinguish between rotation and convection-dominated regimes.

https://aip.scitation.org/doi/10.1063/5.0065134

[2] P. P. Shevkar, R. Vishnu, S. K. Mohanan, V. Koothur, M. Mathur, B. A. Puthenveettil, ”On separating plumes from boundary layers in turbulent convection”, under review in Journal of Fluid Mechanics, 2021.
This experimental and numerical study attempts to establish an objective criterion to detect thermal plumes.

[3] R. Vishnu, A. Sameen, ”Heat transfer scaling in thermal convection with shear due to rotation”, Physical Review Fluids, Volume 5, Issue 11, 2020.
This numerical study explores the laws of scaling in heat transfer in swirl flows and proposes a parameter to demarcate different flow regimes.

https://journals.aps.org/prfluids/abstract/10.1103/PhysRevFluids.5.113504

[4] R. Vishnu, A. Sameen, ”Heat transport in rotating-lid Rayleigh–Bénard convection”, Physica Scripta, Volume 94, Number 5, 2019.
This numerical work describes the flow patterns from velocity and temperature contours in the convection and rotation dominated regimes.

https://iopscience.iop.org/article/10.1088/1402-4896/ab0448/meta

[5] S. A. Pawar, R. Vishnu, M. Vadivukkarasan, M. V. Panchagnula, R. I. Sujith, ”Intermittency Route to Combustion Instability in a Laboratory Spray Combustor”, Journal of Engineering for Gas Turbines and Power 138 (4), 041505, 2016.
In this experimental work, we investigate the transition of a thermoacoustic system from aperiodic oscillations to limit cycle oscillations through intermittency and report the first experimental observation of type-II intermittency in a spray combustion system.

https://asmedigitalcollection.asme.org/gasturbinespower/article/138/4/041505/384767/Intermittency-Route-to-Combustion-Instability-in-a

[6] R. Vishnu, R. I. Sujith, P. Aghalayam, ”Role of flame dynamics on the bifurcation characteristics of a ducted V – flame”, Combustion Science and Technology, Vol.187, Issue 6 pp. 894-905, 2015.
In this experimental study, we correlate each dynamical state with patterns in flame and emphasizes the role of nonlinear flame dynamics in establishing the dynamical state of the system.

https://www.tandfonline.com/doi/full/10.1080/00102202.2014.979287

[7] R. Vishnu, R. I. Sujith, P. Aghalayam, ”Investigation of Flame Dynamics in a V – Flame Combustor During Combustion Instability”, Proceedings Paper, ASME 2014 Gas Turbine India Conference, GTINDIA2014-8345, V001T03A017, 2014.
In this experimental work, the thermo-acoustic instability regime of a combustor is identified and high speed flame images were correlated with corresponding dynamical states. The work revealed role of the nonlinear heat release mechanism in the established dynamical states.

https://asmedigitalcollection.asme.org/GTINDIA/proceedings-abstract/GTINDIA2014/244013

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