Sourabh Suhas Diwan

Aerodynamics
Email: sdiwan[at]iisc.ac.in
Office Phone Number: +91-80-22932423
Lab Phone Number: +91-80-22933045
Office Room Number: AE213
Education
B.E. (Mechanical Engg.): Walchand College of Engineering Sangli, 2002.
MSc Engg. (Aerospace Engg.): Indian Institute of Science Bangalore, 2005.
PhD (Aerospace Engg.): Indian Institute of Science Bangalore, 2009.
Experience
Postdoctoral Research Associate, Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore, (2009-2012).
Postdoctoral Research Associate, Imperial College London, (2012-2016).
Research Interests
- Experimental aerodynamics
- Bypass transition in boundary layers
- Turbulent flows
- Hydrodynamic stability
- Atmospheric flows
Announcements
Post-doctoral Research Fellow:
Date: 21/11/2020
Opening for a post-doc position to work on DNS of COVID-19 related flows
Applications are invited for the position of a post-doctoral research fellow, to work on a project entitled “Direct numerical simulation of cough/sneeze/speech flows for understanding transmission dynamics of COVID-19-type infections”. This is a multi-institutional project involving researchers from IISc-Bengaluru, ICTS-TIFR-Bengaluru, JNCASR-Bengaluru and Nordita (KTH)- Stockholm. For more details, see https://link.springer.com/article/10.1007/s41403-020-00106-w
The project involves
- To carry out direct numerical simulations (DNS) for cough/sneeze/speech flows using an available code, on a supercomputer housed at one of these institutes.
- To modify the existing code to include the dynamics of individual liquid droplets, including gravitational settling and phase change, and to parallelize the modified code.
- To carry out a study on the computed results to improve our understanding of these flows, and to develop physics-based models.
Required qualifications/skills are as follows:
- PhD in Mechanical/Aerospace/Chemical Engineering or in Physics with the PhD topic being in computational and theoretical fluid dynamics.
- Strong understanding of fluid dynamics, turbulence and moist thermodynamics.
- Good expertise in numerical programming, code parallelization and running codes on a supercomputer.
- Strong publication record.
- Excellent writing and communication skills.
The Postdoctoral Fellow will be expected to make independent and rapid progress.
Those interested are encouraged to apply to the Raman Post-doc program at IISc (https://iisc.ac.in/post-docs/) or the ICTS post-doctoral fellowship program (https://www.icts.res.in/academic/postdoctoral-fellowships). These fellowships are highly competitive and only outstanding candidates will be considered.
For informal queries on the position and the project, contact Dr. Sourabh S. Diwan (sdiwan@iisc.ac.in) / Prof Rama Govindarajan (rama@icts.res.in).
Research Statement
This will be updated soon.
Current Projects
- ARDB project on “Development of probes for highly-resolved measurement of pressure fluctuations in transitional and turbulent flows”. (Jan 2019 – Jan 2021).
- SERB Early Career Research Award for the project entitled “Manipulation of wall turbulence by external forcing for investigating mechanisms causing surface friction drag on transport vehicles”. (March 2019- March 2022).
- ISRO-IISc Space Technology Cell project on “Wall pressure spectrum beneath a turbulent boundary layer: measurement and semi-empirical modelling”. (April 2019 – March 2021).
- DST project as part of the National Centre for Clean-coal Research and Development at the ICER, IISc, Bangalore (PI: Prof Pradeep Datta, Department of Mechanical Engineering, IISc). Co-investigator in Work Package 2 “Heat Exchange Relevant to Supercritical Fluid Power Plants” (November 2018 – November 2023).
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Diwan SS, Morrison JF. Spectral structure and linear mechanisms in a rapidly distorted boundary layer. Int. J. Heat Fluid Flow. 67. 63-73. 2017
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Morrison JF, Diwan SS. Inner-outer interaction in a rapidly sheared boundary layer. In 10th International Symposium on Turbulence and Shear Flow Phenomena (TSFP10). Chicago, USA. 2017
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Diwan SS. “Necessary conditions for spatial inviscid instability”. Proceedings of Royal Society London A. 2015;471. 2015
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Diwan SS, Prasanth P, Sreenivas KR, Deshpande SM, Narasimha R. “Cumulus-type flows in the laboratory and on the computer: simulating cloud form, evolution and large-scale structure”. Bulletin of American Meteorological Society. 2014;95. 2014
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Diwan SS, Morrison JF. Pressure measurements in a rapidly sheared turbulent wall layer. In American Physical Society-Division of Fluid Dynamics 67th Annual Meeting. San Francisco, California, USA. 23-25. 2014
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Diwan SS, Ramesh ON. Relevance of local parallel theory to the linear stability of laminar separation bubbles. Journal of Fluid Mechanics. 2012;698. 2012
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Rao VG, Diwan SS, Sreenivas KR, Narasimha R, Venkatakrishnan L, Suriyanarayanan P. Laboratory simulation of the life-cycle of a cumulus congestus cloud. In Opportunities and Challenges in Monsoon Prediction in a Changing Climate. Pune, India. 2012
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Narasimha R, Diwan SS, Duvvuri S, Sreenivas KR, Bhat GS. Laboratory simulations show diabatic heating drives cumulus-cloud evolution and entrainment. Proceedings of National Academy of Sciences of the USA. 2011;108. 2011
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Diwan SS, Narasimha R, Bhat GS, Sreenivas KR. Laboratory studies of anomalous entrainment in cumulus cloud flows. Journal of Physics: Conference Series.. 2011. 2011
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Narasimha R, Diwan SS, Subrahamanyam D, Sreenivas KR, Bhat GS. Entrainment in Laboratory Simulations of Cumulus Cloud Flows. In American Geophysical Union, Fall Meeting. 2010
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Diwan SS, Ramesh ON. On the origin of the inflectional instability of a laminar separation bubble. Journal of Fluid Mechanics. 2009;629. 2009
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Diwan SS, Ramesh ON. Laminar separation bubbles: Dynamics and control. Sadhana (Proceedings of Indian Academy of Sciences). 2007;32. 2007
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Diwan SS, Ramesh ON. On the Late Stages of Transition in Laminar Separation Bubbles. In 11th Asian Congress of Fluid Mechanics. Kuala Lumpur, Malaysia. 22-25. 2006
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Diwan SS, Chetan SJ, Ramesh ON. On the bursting criterion for laminar separation bubbles. In Sixth IUTAM Symposium on Laminar-Turbulent Transition. Bangalore, India. 2004
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Diwan SS, Chetan SJ, Ramesh ON. On the Origin of Three-Dimensionality in a Two-Dimensional Laminar Boundary Layer Separation. In American Physical Society-Division of Fluid Dynamics 57th Annual Meeting. Seattle, Washington, USA. 2004
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Morrison J, Septham K, Diwan SS, Sanmiguel-Vila C. Effects of shear and blocking in a rapidly distorted boundary layer. In Wall Turbulence: A colloquium under the midnight sun. Throndheim, Norway. 2004
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Subramanyam D, Sreenivas KR, Bhat GS, Diwan SS, Narasimha R. “Experimental study of starting plumes simulating cumulus cloud flows in the atmosphere”. In American Physical Society-Division of Fluid Dynamics 62nd Annual Meeting. Minneapolis, Minnesota, USA. 2004
PhD students:
Abhishek Tyagi
Aditya Anand
Amey Agharkar (jointly with Prof Pramod Kumar, ME)
Robin Joseph
Rohit Singhal
Satyajit DE
Srinivas Kirthy K (jointly with Prof. O. N. Ramesh, AE)
Project Associates:
I. Sai Eswar (ARDB project)
Chandan Kumar A. (SERB project)
B K Suhas (ISRO-STC project)
Post-doc Associates:
Current
Dr Samson Annapu Reddy
Past
Dr P Phani Kumar