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Announcements related to HPCL

Certificate of outstanding contribution in reviewing: Journal of computational physics, awarded July, 2015 to Prof. Tapan K. Sengupta. Certificate of Outstanding Reviewer JCP.pdf

1) Pramodkumar Bagade defended his PhD thesis successfully on 6th May, 2016 at IIT Kanpur; 2) Kartikey Asthana has defended his PhD thesis at Stanford University on 17th May, 2016; 3) Jyoti Sangwan defended her M. Tech. thesis on compressibility effects on dynamic stall; 4) Atchyut defended his M. Tech. thesis on reduced order models and 5) Zulqarnain Akbar Shabab defended his M. Tech. thesis on transition by polychromatic excitation. He also investigated the start-up process of excitation on STWF.

Prof. Sengupta will be visiting Univ. of Cambridge, UK for the next few months as a Senior Visiting Fellow of Murray-Edwards College and Univ. Engg. Dept, working with the Rank Professor Paul Tucker and his team. He has also plans to visit France subsequently. He will be back in IIT Kanpur by the beginning of November, 2016. Contact him through email.

We announce the MHRD sponsored Global Initiative on Academic Network (GIAN) program to be held in IIT Bhubaneswar conducted by Profs. Yogesh Bhumkar and Satyanarayana. The resource person from outside the country is Prof. D. V. Gaitonde from OSU, USA and Prof. Sengupta of HPCL will be the resource person from India.
Title of the course: Computational Acoustics: Engineering and scientific approaches.
Dates: May 23- June 03, 2016
For registration and details, see the
Computational Acoustics Brochure Dr. Bhumkar.pdf

TKS is back from I2M laboratory, Univ. of Bordeaux (France) after spending three months. Very nice stimulating environment. We have started working on POD and ROM with Prof. Mejdi Azaiez and his group. During his stay, TKS had exchanges with research group from Univ. of La Rochelle. He presented various HPCL works at Bordueax, EPFL (Lausanne) and TUW (Vienna) and UPMC (Paris).

Ph. D. Thesis titled "Study of Transition in the Presence of Free Stream Turbulence for Internal and External Flows":- by Pramodkumar M. Bagade. Final defence is on 6th May, 2016.

Graduating students' farewell at HPCL in 2015. Photo

Book review of Theoretical and Computational Aerodynamics (John Wiley, UK) appeared in Aeronautical Journal of Royal Aeronautical Society. Writing this book was possible with help from all at HPCL.

Transition to turbulence-- the physical mechanism explained in:
Precursor of Transition to Turbulence: spatiotemporal wave front
by: Swagata Bhaumik and Tapan K Sengupta; In: Physical Review E.
Journal link:
Recent developments announced in the IUTAM SYMPOSIUM URL:

Third International Conference on Meta Computing 2012, held in Bhubaneswar. Conference Co-Chair: Prof. Tapan K Sengupta
Best papers: Drs. V. Mudkavi/ K. Venkatesh (NAL Bangalore) and Pramod Bagade/ B. Satish (IIT Kanpur)

DNS of Transition and Turbulence in Physical Review Letters - see link (1) below.
Also the paper: "Direct numerical simulation of two-dimensional wall-bounded turbulent flows
from receptivity stage" February 2012, Physical Review E (Vol.85, No.2):
Related links :

The IIT Kanpur, HPCL group has provided definitive answers to CAUSALITY of turbulence
in wall bounded boundary layers. Through the work on Bromwich contour integral method
(developed in IITK since 1990) spatio-temporal wave-front (STWF) have been shown as the main
precursor to transition and turbulence (PRL, 2006, 2011, PRE 2014 and the CRC text book, see the side-bar).
High accuracy computing of Navier-Stokes equation also attest to formation of STWF leading to fully-developed
turbulence via deterministic excitation of laminar flow in RECEPTIVITY framework.


    TKS is on sabbatical (Dec. 2015 to Nov. 2016) and has visited Univ. of Bordeaux, France and Univ. of Cambridge, UK. He has presented various works at different European universities done at HPCL. Mostly our works on transition, high accuracy computing method and reduced order models are discussed and presented.

Summer visitors/ interns at HPCL in 2015: Dr. Manoj Rajpoot studied compact schemes in non-uniform grids. Paper by Aditi and TKS on this topic has appeared in JCP. Prayash's work is under review. Comprehensive work on non-uniform grid compact scheme is in progress by Nidhi and Roshan. We like to provide definitive answer to numerical properties and filters for random grid spacing- a first step towards analysis of unstructured grids in computing by GSA.

ROM for flow over airfoil by Atchyut is done! Zulqar has come out with some very fundamental work on transition, which is very exciting! Jyoti has joined Eaton at Pune and Atchyut is in Bengaluru.

Older News:
Akhil is with Rolls Royce; Ijlal is placed with Airbus. Nilesh is teaching in Pune/ Mumbai. Prasoon has joined Georgia Tech. His work on dynamic stall is a new yard-stick of activities at HPCL. This follows the work of Sreejith and Ashish on developing transonic flow code which is also modified for Rayleigh-Taylor instability (RTI). Aditi is in Univ. of Cambridge. We are looking at non-equilibrium thermodynamical aspect of RTI and role of Stokes hypothesis. Nidhi and Roshan has developed a 3D compressible ILES code for 3D RTI. We will report results shortly. Vikram Singh (2009 BT-MT) has joined Technion for his PhD. Pushpendra Sharma, the new PhD student, in the group is doing very well. He will be our bridge between Univ. of Bordeaux and IIT Kanpur. He has started very promisingly on channel flow transition

Dr. A Kameshwar Rao is now with IIT Madras (Dept. of Mech. Engg.). Prof. Manoj T. Nair is at IIST in Thiruvananthapuram, Dr. Sudipta De is at CMERI Durgapur and Prof. Venkatasubbaiah is in IIT Hyderabad. Other senior members of HPCL: Sarthok Sircar is a faculty at Univ. of Adellaide; Anurag Dipankar is somewhere in Singapore. Rajarshi doing his PhD at UPMC in Paris. Vijay is doing his post-doc in Stanford. Swagata continues at OSU. Rikhi is at Iowa State Univ. for his PhD; Shakti is in UIUC doing PhD, Unni and Soumyo are at OSU, Columbus, Ohio, Ashwin VM is at KTH and Shriramakrishnan is in Univ. of Texas. Abir and Himansu are with Eaton; Pallavi, Lakshmanan and Sreejith are with GE.

TKS presented works at the following conferences/ workshops (2015): 1) Indian Science Congress for an invited talk; ii) Keynote speech in Int. Conf. on Fluid Mechanics at Univ. of Gauhati; iii) JETC Conf. on Thermodynamics in Nancy, France; iv) Keynote speech and contributed paper in Turbulence & Interaction (TI-2015) at Corsica, France v) Conf. on Computational Physics (CCP-2015) at IIT Gauhati and vi) an Invited talk in Sarod-2015 at VSSC.

    Non-equilibrium thermodynamics of Rayleigh-Taylor instability, Int. J. of Thermophysics (2016)

    A new alternating bi-diagonal compact scheme for non-uniform grids, J. Comput. Phys. (2016) DOI: 10.1016/

    Work on Reduced Order Modeling by POD: Physical Review E, vol. 91(4), 043303 (2015) DOI: 10.1103/PhysRevE.91.043303

    GSA of Bi-Directional Wave Equation: J. Computational Physics (2015)

    IUTAM symposium on Advances in Computation, Modeling and Control of Transitional and Turbulent Flows was held in Goa, India during 15-18 December, 2014. The proceedings from WSPC is out! Visit the web-site:

    Paper titled Precursor of transition to turbulence: Spatio-temporal wave front by Dr. Swagata Bhaumik and Tapan Sengupta in Phys. Rev. E explains by DNS the route to turbulence by wall excitation. Click for paper

    Article Usage for: "Direct Numerical Simulation of 2D Transonic Flows around Airfoils," Sengupta T.K., Bhole A., Sreejith N.A., Click here

    HPCL news: " KdV equation and computation of Solitons: Nonlinear error dynamics," Ashwin Vishnu M, Kumar Saurabh, M Sriramkrishnan, PM Bagade, MK Parvathi and Sengupta T.K.,

    "Diffusion in inhomogeneous flows: Unique equilibrium state in an internal flow," Tapan K. Sengupta, Himanshu Singh, Swagata Bhaumik, Rajarshi Roy Chowdhury. A major work published in CAF, showing how small scales are created in fluid flow by diffusion for 2D/3D inhomogeneous flows without any assumptions. This mechanism is much stronger than vortex stretching, for 3D flows. For 2D flows, of course, vortex stretching is absent. This being for inhomogeneous flows, is thus more general than any other competing ideas! You know what we mean here!!

    The book : "Theoretical and Computational Aerodynamics" has been published by Wiley, UK. See the review in Aeronautical Journal of Royal Aeronautical Society, Feb. 2015 issue. Contains chapters on (i) computational aerodynamics, (ii) NLF and transitional flow related to aerodynamics, (iii) transonic aerodynamics and (iv) low Reynolds number unsteady aerodynamics. A companion volume has appeared with problems and lots of animations explaining certain aspects of Aerodynamics. Check Wiley site for further details.

    The book: "High Accuracy Computing Methods: Fluid Flows and Wave Phenomena" is published by Cambridge University Press (2013) with an Indian edition available. Foreword written by Prof. Michel Deville. See:

    Swagata Bhaumik is at OSU with Prof. Datta V. Gaitonde. His work on transition and turbulence is culmination of contributions by HPCL over the past two decades, starting with the work on Bromwich contour integral methods in early 90's.

    A 40 parts lecture series on Foundations of Scientific Computing taught to IIT Kanpur undergraduate students (2009) as a science elective is available as NPTEL courses.
Shortly transcripts will be available in Indian languages via an NPTEL initiative. Similar video course on Transition and Turbulence is also available and being transcribed.

NPTEL Courses:
1. Foundations of Scientific Computing (2009)
2. Instability and Transition of Fluid Flows (2010)

    TKS's visit in 2012: (i) Ecole Polytechnique, Montreal (June-July, 2012); (ii) Center for Advanced Studies in Theoretical Sciences (CASTS) at National Taiwan Univ., Taipei, Taiwan for "Progress in Mathematical and Computational Studies on Science and Engineering Problems" conference, November, 2012. Photo

    The book: "Instabilities of Flows and Transition to Turbulence" published by CRC Press, Taylor & Francis Group, USA with details in:

    Prof. T. K. Sengupta has helped Tata McGraw-Hill for the Indian edition of Fundamentals of Aerodynamics by Prof. J. D. Anderson, augmented with SI Metrication and a chapter on Aerodynamic Research Activities in India written by him.

    Prof. Michel Deville's visit to HPCL in 2010: Prof. Michel Deville ( Ecole Polytechnique Federale de Lausanne, Switzerland) visited HPCL and delivered lectures on Spectral Element Method . Photo

    Recent trends in HPC at HPCL, IIT Kanpur, Sep 2009: Account of work done in HPCL, IIT Kanpur, on methods for DNS/ LES was displayed in the Workshop on "High Performance Computing in India" in conjunction with "Supercomputing 2009" (SC09), Nov. 14-20, 2009 (USA).

    Issues related to DNS / LES were the central themes of the plenary talk given at the Fifth M.I.T. conference at Boston, June 2009

1. Three-time level methods like second order Adam-Bashforth schemes are incorrectly used for "DNS". Following papers show that numerical/ spurious mode removes large fraction of initial condition at higher frequencies. Details in HIGH ACCURACY COMPUTING METHOD (CUP, 2013) and the following papers:

a) A Comparative Study of Time Advancement Methods for Solving Navier-Stokes Equations

Dowload comparative study.. paper from springerlink

b) High Accuracy Schemes for DNS and Acoustics

Download the DNS and acoustics paper from springerlink

2. The von Neumann analysis for PDEs has been corrected, with the help of 1D convection equation. See the CUP book and the following from J. Computational Physics:

a) Error Dynamics: Beyond von Neumann Analysis -- T.K. Sengupta, A. Dipankar and P. Sagaut, 226, 1211-1218 (2007)
Dowload Error dynamics: Beyond von Neumann analysis paper from Science Direct