8 citations · 12 across the 24 of their papers we have counts for
13 papers · 1 filter
Metamorphosis of transition between states of limit cycle oscillations in aeroacoustic system
Siddharth Kancharlapalli, Beeraiah Thonti, Sivakumar Sudarshanan +2
Dynamical systems undergoing transition to oscillatory state exhibit change in the nature of the transition from supercritical to subcritical Hopf bifurcation or vice versa upon va…
Periodic modulation of the space-filling nature of the turbulent flame leads to spiky heat release oscillations
Sivakumar Sudarsanan, Manikandan Raghunathan, Shwetha Viswesh +1
Spiky oscillations are characterized by slow-fast dynamics and are observed in excitable media such as neuronal membranes and cardiac cells. In a turbulent reactive flow system, we…
Modeling the influence of interactions on different variables in a turbulent thermoacoustic system
Aneesh Srivatsa, Shruti Tandon, Andrea Elizabeth Biju +3
Turbulent reacting flows confined to ducts are plagued by thermoacoustic instability, a state in which a positive feedback between flow, flame and acoustic perturbations leads to t…
A network-theoretic approach for characterizing Mack-mode instability in high-speed boundary layers
Sai Prasad Mohanty, Nikhil Khobragade, Gaurav Chopra +3
Here we present a network theory-based approach to investigate the Mack-mode instability signature found in high-speed schlieren data from a Mach 6 laminar boundary layer flow over…
The role of disordered dynamics on the nature of transition in a turbulent reactive flow system
Sivakumar Sudarsanan, Induja Pavithran, R. I Sujith
The transition from a chaotic to a periodic oscillatory state can be smooth or abrupt in real-world turbulent systems. Although there have been several mathematical studies, the oc…
Metamorphosis of transition to periodic oscillations in a turbulent reactive flow system
Beeraiah Thonti, Sivakumar Sudarsanan, Ramesh S. Bhavi +3
The emergence of periodic oscillations is observed in various complex systems in nature and engineering. Thermoacoustic oscillations in systems comprising turbulent reactive flow e…
Identifying feedback directions in the mechanisms driving self-sustained thermoacoustic instability in a single-element rocket combustor
Somnath De, Praveen Kasthuri, Matthew E. Harvazinski +3
The occurrence of high frequency (>1000 Hz) thermoacoustic instability (TAI) sustained by mutual feedback among the acoustic field, heat release rate oscillations, and hydrodynamic…
Canard explosions in turbulent thermo-fluid systems
Ramesh S. Bhavi, Sivakumar Sudarsanan, Manikandan Raghunathan +2
A sudden transition to a state of high amplitude limit cycle oscillations is catastrophic in a thermo-fluid system. Conventionally, upon varying the control parameter, a sudden tra…
Vortical interactions in turbulent thermoacoustic systems
Ankit Sahay, Muralikrishnan Gopalakrishnan Meena, R. I. Sujith
This study examines the dynamics of vortical interactions and their implications for mitigating thermoacoustic instability in a turbulent combustor. The regions of intense vortical…
Non-monotonic emergence of order from chaos in turbulent thermo-acoustic fluid systems
Aswin Balaji, Shruti Tandon, Norbert Marwan +2
Self-sustained order can emerge in complex systems due to internal feedback between coupled subsystems. Here, we present our discovery of a non-monotonic emergence of order amidst…
Emergence of order from chaos through a continuous phase transition in a turbulent reactive flow system
Sivakumar Sudarsanan, Amitesh Roy, Induja Pavithran +2
As the Reynolds number is increased, a laminar fluid flow becomes turbulent, and the range of time and length scales associated with the flow increases. Yet, in a turbulent reactiv…
Explosive synchronization in a turbulent reactive flow system
Amal Joseph, Induja Pavithran, R. I. Sujith
The occurrence of abrupt dynamical transitions in the macroscopic state of a system has received growing attention. We present experimental evidence for abrupt transition via explo…
Coupled thermoacoustic interactions in hydrogen enriched lean combustion
Abhishek Kushwaha, Amitesh Roy, Ianko Chterev +2
In this paper, we present a framework to study the synchronization of flow velocity with acoustic pressure and heat-release rate in technically-premixed swirl flames. The framework…