ICTS

Emails

ssray@icts.res.in
samriddhisankarray@gmail.com

Phone Numbers 

Click here for my complete Curriculum Vitae.

Education
2010: PhD in Physics, Indian Institute of Science, Bangalore.
2006: MS in Physics, Indian Institute of Science, Bangalore.
2003: BSc in Physics, Presidency College, Calcutta University, Kolkata.

Click here for my PhD thesis.
 

Research Interests

• Fluid, magnetohydrodynamic, passive-scalar, and Burgers turbulence.
• Inertial (finite-sized) particles in turbulent flows.
• Truncated systems, thermalization, and statistical mechanics of turbulent flows.
• Singularities in the Euler equation.
• Active turbulence.

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                                                                               Group Members

Post-Doctoral Fellows       

1.  Dr Prateek Anand  (Ongoing)     
2.  Dr Arun Kumar Varanasi  (Ongoing)           
3.  Dr Siddhartha Mukherjee  [Now: Assistant Professor, Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, India]
4.  Dr Priyanka Maity [Now: Research & Development Scientist, UV Technik Speziallampen GmbH, Ilmenau, Germany]
5.  Dr Jason R. Picardo  [Now: Assistant Professor, Department of Chemical Engineering, Indian Institute of Technology Bombay, Mumbai, India]
6.  Dr Divya Venkataraman  [Now: Assistant Professor, Department of Mathematics, Institute of Chemical Technology, Mumbai, India]     

PhD Students                                            

1.   Sandip Sahoo (Ongoing)
2.   Mrinal Jyoti Powdel (Ongoing)***
3.   Ritwik Mukherjee (Ongoing)
4.   Harshit Joshi  (Ongoing)** 
5.   Shashank Roy (Ongoing)* [Now: Deep Learning Researcher and Development Engineer, IMT Atlantique Bretagne Pays de la Loire, Nantes, France]
6.   Dr Sugan Durai Murugan (2023) [Now: Post-doctoral Fellow, Johns Hopkins University, USA]
7.   Dr Rahul Kumar Singh (2022) [Now: Post-doctoral Fellow, Okinawa Institute of Science and Technology (OIST), Japan] 

     *** Co-Advisor: Professor Anupam Kundu
     ** Co-Advisor: Professor Rama Govindarajan
     * Primary Advisor: Professor Amit Apte

   [For a list of visiting, Masters' and Bachelors' students, please click on my CV]

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Publications   

64. The Onset of Intermittency in Active Turbulence,
      K. V. Kiran, K. Kumar, A. Gupta, R. Pandit and Samriddhi Sankar Ray.
      ArXiv: 2408.06950

63. An upper critical dimension for dynamo action: A d-dimensional closure model study,
      S. D. Murugan, G. Krstulovic,  D. Vincenzi and Samriddhi Sankar Ray.
      ArXiv: 2408.01266

62. Pair statistics of anisotropic particles settling in a turbulent flow,
      P. Anand and Samriddhi Sankar Ray.
      ArXiv: 2404.09635

61. Turbulent flows are not uniformly multifractal,
      S. Mukherjee, S. D. Murugan, R. Mukherjee and Samriddhi Sankar Ray.
      Physical Review Letters 132, 184002 (2024)

60. Genesis of thermalization in the three-dimensional, incompressible, Galerkin-truncated Euler equation,
      S. D. Murugan and Samriddhi Sankar Ray.
      Physical Review Fluids 8, 084605 (2023)

59. Intermittency, fluctuations and maximal chaos in an emergent universal state of active turbulence,
      S. Mukherjee, R. K. Singh, M. James and Samriddhi Sankar Ray.
      Nature Physics 19, 891 (2023)

58. Turbulent route to two-dimensional soft crystals,
      M. Gupta, P. Chaudhuri, J. Bec, and Samriddhi Sankar Ray.
      Physical Review E (Letters)  106, L062601 (2022)

57. Sedimenting Elastic Filaments in Turbulent Flows,
      R. K. Singh, J. R. Picardo and Samriddhi Sankar Ray.
      Physical Review Fluids 7, 084502 (2022)

56. Dynamic Scaling in Rotating Turbulence: A Shell Model Study,
      S. K. Rathor, S. Chakraborty and Samriddhi Sankar Ray.
      Physical Review E (Letters) 105, L063102 (2022)

55. Lagrangian Manifestations of Anomalies in Active Turbulence,
      R. K. Singh, S. Mukherjee and Samriddhi Sankar Ray.
      Physical Review Fluids 7, 033101 (2022)

54. Editorial: Scaling the Turbulence Edifice,
      J. Bec, G. Krstulovic, T. Matsumoto, Samriddhi Sankar Ray and D. Vincenzi.
      Philosophical Transactions of the Royal Society A 380, 2219 (2022).
      [Editorial for the second part of a special issue Scaling the Turbulence Edifice of the Philosophical Transactions of the Royal Society.] 

53. Editorial: Scaling the Turbulence Edifice,
      J. Bec, G. Krstulovic, T. Matsumoto, Samriddhi Sankar Ray and D. Vincenzi.
      Philosophical Transactions of the Royal Society A 380, 2218 (2022).
      [Editorial for the first part of a special issue Scaling the Turbulence Edifice of the Philosophical Transactions of the Royal Society.] 

52. Many-body Chaos in Thermalised Fluids,
      S. D. Murugan, D. Kumar, S. Bhattacharjee, and Samriddhi Sankar Ray.
      Physical Review Letters 127, 124501 (2021)

51. Anomalous Diffusion and Levy Walks Distinguish Active Turbulence from Inertial Turbulence,
      S. Mukherjee,  R. K. Singh, M. James and Samriddhi Sankar Ray.
      Physical Review Letters 127, 118001  (2021) [Editors' Suggestion]. 
      Featured in Physics: [Physics 14, s116 (2021)] Bacteria That Shove Harder, Move Further

50. Polymer scission in turbulent flows,
      D. Vincenzi, T. Watanabe,  Samriddhi Sankar Ray, and J. R. Picardo. 
     Journal of Fluid Mechanics 912, A18 (2021).

49. Bridging Inertial and Dissipation Range Statistics in Rotating Turbulence,
      S. K. Rathore, M. K. Sharma, Samriddhi Sankar Ray, and S. Chakraborty. 
      Physics of Fluids 32, 095104 (2020)​.

48. Statistics of the Kinetic Energy of Heavy, Inertial Particles in Weakly Rotating Turbulence,
      P. Maity and  Samriddhi Sankar Ray. 
      Indian Academy of Sciences Conference Series, 3:1 (2020)

47. Suppressing thermalization and constructing weak solutions in truncated inviscid equations of hydrodynamics: Lessons from the Burgers           equation
      S. D. Murugan, U. Frisch, S. Nazarenko, N. Besse, and Samriddhi Sankar Ray,
      Physical Review Research, 2, 033202 (2020)

46. Orientation dynamics of sedimenting particles anisotropic particles in turbulence,
      P. Anand,  Samriddhi Sankar Ray, and G. Subramanian. 
      Physical Review Letters 125, 034501 (2020).

45. Fluid dynamics in clouds: The sum of its parts,
      S. Ravichandran, J. R. Picardo, Samriddhi Sankar Ray, and R. Govindarajan. 
      Encyclopedia of Complexity and Systems Science. Springer, Berlin, Heidelberg (2020)

44. Dynamics of a long chain in turbulent flows: Impact of vortices,
      J. R. Picardo, R. Singh, Samriddhi Sankar Ray, and D. Vincenzi. 
      Philosophical Transactions of the Royal Society A, 378, 20190405 (2020).

43. Elasto-inertial Chains in a Two-dimensional Turbulent Flow,
      R. Singh, M. Gupta, J. R. Picardo, D. Vincenzi, and Samriddhi Sankar Ray. 
      Physical Review E 101, 053105 (2020).

42. Flocking of active particles in a turbulent flow,
      A Gupta, A. Roy, A. Saha, and Samriddhi Sankar Ray.
      Physical Review Fluids (Rapids) 5, 052601(R) (2020). 

41. Lagrangian Irreversibility and Eulerian Dissipation in Fully-Developed Turbulence,
      J. R. Picardo, A. Bhatnagar, and Samriddhi Sankar Ray. 
      Physical Review Fluids (Rapids) 5,  042601(R) (2020).

40. Analytic structure of solutions of the one-dimensional Burgers equation with modified dissipation,
      W. Pauls and Samriddhi Sankar Ray. 
      Journal of Physics A: Mathematical and Theoretical 53, 115702 (2020).

39. Statistics of Lagrangian Trajectories in a Rotating Turbulent Flow,
      P. Maity, R. Govindarajan, and Samriddhi Sankar Ray.
      Physical Review E 100, 043110 (2019).

38. Droplet Collisions in Turbulence: Insights from a Burgers Vortex,
      L. Aghasthya, J. R. Picardo, S. Ravichandran, R. Govindarajan, and Samriddhi Sankar Ray.
      Physical Review E 99, 063107 (2019).

37. Flow Structures Govern Particle Collisions in Turbulence,
      J. R. Picardo, L. Aghasthya, R. Govindarajan, and Samriddhi Sankar Ray.
      Physical Review Fluids (Rapids) 4, 032601(R) (2019).

36. Preferential Sampling of Elastic Chains in Turbulent Flows,
      J. R. Picardo, D. Vincenzi, N. Pal, and Samriddhi Sankar Ray.
      Physical Review Letters 121, 244501 (2018).

35. Inertial Ellipsoids in Homogeneous, Isotropic Turbulence,
     A. Roy, A. Gupta, and Samriddhi Sankar Ray.
     Physical Review E (Rapids) 98, 021101(R) (2018).

34. Light-cone spreading of perturbations and the butterfly effect in a classical spin chain,
     A. Das, S. Chakrabarty, A. Dhar, A. Kundu, D. A. Huse, R. Moessner, Samriddhi Sankar Ray, and S. Bhattacharjee.
     Physical Review Letters 121, 024101 (2018).

33. Droplets in isotropic turbulence: deformation and breakup statistics,
     Samriddhi Sankar Ray and D. Vincenzi.
     Journal of Fluid Mechanics 852, 313  (2018).

32. Non-intermittent Turbulence: Lagrangian Chaos and Irreversibility,
     Samriddhi Sankar Ray.
     Physical Review Fluids (Rapids) 3, 072601(R) (2018).

31. Exotic multifractal conductance fluctuations in graphene, 
     K. R. Amin, Samriddhi Sankar Ray, N. Pal, R. Pandit, and A. Bid.
     Communications Physics 1, 1 (2018).

30. Revisiting the SABRA model: Statics and Dynamics,
     R. Tom and Samriddhi Sankar Ray.
      Europhysics Letters 120, 34002 (2018)

29.  An overview of the statistical properties of two-dimensional turbulence in fluids with particles, conducting fluids, fluids with polymer additives, binary-fluid mixtures, and   superfluids,
     R. Pandit, D. Banerjee, A. Bhatnagar, M.-E. Brachet, A. Gupta, D. Mitra, N. Pal, P. Perlekar,  Samriddhi Sankar Ray, V. Shukla, and D. Vincenzi.
     Physics of Fluids 29, 111112 (2017).

28. Enhanced droplet collision rates and impact velocities in turbulent flows: The effect of polydispersity and transient phases,
     M. James and Samriddhi Sankar Ray.
     Scientific Reports 7, 12231 (2017).

 27. The onset of thermalisation in finite-dimensional equations of hydrodynamics,
     D. Venkataraman and Samriddhi Sankar Ray.
     Proceedings of the Royal Society A 473, 20160585 (2017)

26. Semi-flexible particles in isotropic turbulence,
    A. Ali, E. L. C. M. Plan, Samriddhi Sankar Ray, and D. Vincenzi.
    Physical Review Fluids (Rapids) 1, 082402(R) (2016)

25. Lagrangian Statistics for Navier-Stokes Turbulence under Fourier-mode reduction: Fractal and Homogeneous Decimations,
     M. Buzzicotti, A. Bhatnagar, L. Biferale, A. Lanotte and Samriddhi Sankar Ray.
     New Journal of Physics 18, 113047 (2016)

24. Dynamic multiscaling of magnetohydrodynamic turbulence,
     Samriddhi Sankar Ray, G. Sahoo, and R. Pandit.
     Physical Review E 94, 053101 (2016)

23. Elastic turbulence in a shell model of polymer solution,
     Samriddhi Sankar Ray and D. Vincenzi.
     Europhysics Letters 114, 44001 (2016)

22. Intermittency in fractal Fourier hydrodynamics: Lessons from the Burgers equation,
     M. Buzzicotti, L. Biferale, U. Frisch and Samriddhi Sankar Ray.
     Physical Review E 93, 033109 (2016)

21. Abrupt growth of large aggregates by correlated coalescences in turbulent flow,
     J. Bec, Samriddhi Sankar Ray, E.-W. Saw and H. Homann.
     Physical Review E (Rapids) 93, 031102(R) (2016)

20. Effect of inertia on Model Flocks in a Turbulent Environment,
    A. Choudhary, D. Venkataraman, and Samriddhi Sankar Ray.
    Europhysics Letters, 112, 24005 (2015) [Editor's Choice]

19. Thermalised solutions, statistical mechanics and turbulence: An overview of some recent results,
     Samriddhi Sankar Ray.
    Perspectives in Nonlinear Dynamics, Pramana - Journal of Physics, 84, 395 (2015)

18. Extreme fluctuations of the relative velocities between droplets in a turbulent airflow,
     E.-W. Saw, G. P. Bewley, E. Bodenschatz, Samriddhi Sankar Ray, and J. Bec.
     Physics of Fluids Letters, 26, 111702 (2014)   

17. Transition from dissipative to conservative dynamics in equations of hydrodynamics,
     D. Banerjee and Samriddhi Sankar Ray.
     Physical Review E (Rapids), 90, 041001(R) (2014)                    

16. Gravity-driven enhancement of heavy particle clustering in turbulent flow,
     J. Bec, H. Homann, and Samriddhi Sankar Ray.
     Physical Review Letters 112, 184501 (2014)                       

15.  Multiscaling in Hall-Magnethydrodynamic Turbulence: Insights from a Shell Model,
      D. Banerjee,  Samriddhi Sankar Ray, G. Sahoo, and R. Pandit.
      Physical Review Letters 111, 174501 (2013)

14. Sticky elastic collisions,
     J. Bec, S. Musacchio, and Samriddhi Sankar Ray.
     Physical Review E 87, 063013 (2013)

13. Real-space Manifestations of Bottlenecks in Turbulence Spectra,   
     U. Frisch, Samriddhi Sankar Ray, G. Sahoo, D. Banerjee, and R. Pandit.
     Physical Review Letters 110, 064501 (2013)

12. Turbulence in non-integer dimensions by fractal Fourier decimation,
     U. Frisch, A. Pomyalov, I. Procaccia, and Samriddhi Sankar Ray.
     Physical Review Letters 108, 074501 (2012)

11. Nelkin scaling for the Burgers equation and the role of high-precision calculations,
     S. Chakraborty, U. Frisch, W. Pauls, and Samriddhi Sankar Ray.
     Physical Review E (Rapids) 85, 015301(R) (2012)

10. Dynamic Multiscaling in Two-dimensional Fluid Turbulence,
     Samriddhi Sankar Ray, D. Mitra, P. Perlekar, and R. Pandit.
     Physical Review Letters 107, 184503 (2011)

9. Universality of scaling and multiscaling in turbulent symmetric binary fluids,
     Samriddhi Sankar Ray and A. Basu.
     Physical Review E 84, 036316 (2011)

8. Resonance phenomenon for the Galerkin-truncated Burgers and Euler equations,
     Samriddhi Sankar Ray, U. Frisch, S. Nazarenko, and T. Matsumoto.
     Physical Review E 84, 016301 (2011)

7. The Persistence Problem in Two-Dimensional Fluid Turbulence,
      P. Perlekar, Samriddhi Sankar Ray, D. Mitra, and R. Pandit.
      Physical Review Letters 106, 054501 (2011)

6. Entire solutions of hydrodynamical equations with exponential dissipation,
      C. Bardos, U. Frisch, W. Pauls, Samriddhi Sankar Ray, and E. S. Titi.
      Communications in Mathematical Physics 293, 519 (2010)

5. Extended Self Similarity works for the Burgers equation and why,
      S. Chakraborty, U. Frisch, and Samriddhi Sankar Ray.
      Journal of Fluid Mechanics 649, 275 (2010)

4. Statistical Properties of Turbulence: An Overview,
      R. Pandit, P. Perlekar, and Samriddhi Sankar Ray.
      Pramana - Journal of Physics 73, 157 (2009)

3. Dynamic Multiscaling in Turbulence,
      R. Pandit, Samriddhi Sankar Ray, and D. Mitra.
      European Physics Journal B 64, 463 (2008)

2. The Universality of Dynamic Multiscaling in Homogeneous, Isotropic Navier-Stokes and Passive-Scalar Turbulence,
      Samriddhi Sankar Ray, D. Mitra, and R.Pandit.
      New Journal of Physics 10, 033003 (2008)

1. Hyperviscosity, Galerkin truncation and bottlenecks in turbulence,
      U. Frisch, S. Kurien, R. Pandit, W. Pauls, Samriddhi Sankar Ray, A. Wirth, and J-Z Zhu.
      Physical Review Letters 101, 144501 (2008)