Summer school at CISM, Udine, Italy during 21-25 May, 2018 CISM Summer School 2018.pdf

Symposium proceedings on "Advances in Computation, Modeling and Control of Transitional and Turbulent Flows." is published by World Scientific Publishing Company, Singapore. Link of Book.

New Book titled "Theoretical and Computational Aerodynamics" is published by John Wiley Press. Book Review.

"High Accuracy Computing Methods: Fluid Flows and Wave Phenomena" is published by Cambridge University Press.

"Instabilities of Flows and Transition to Turbulence" is published by CRC Press/ Taylor & Francis.

Monograph titled "Instabilities of Flow: with and without Heat Transfer and Chemical Reaction" is published by Springer Wien-New York.

Textbook titled "Fundamentals of CFD" published by Universities Press, Hyderabad, India. "CFD Book Review"

"International Conference On Metacomputing"

Keynote talk at National Institute of Oceanography, Dona Paula, Goa on December 17 2010 by Mr. Swagata Bhaumik.

"National Symposium on HPC in Academia and Beyond"

TALK at BESU, Shibpur, Kolkata on March 4 2010 by Prof. T.K. Sengupta.

MIT PRESENTATIONS (click on the links below)

PLENARY TALK on DNS by Prof T.K. Sengupta at 5th M.I.T Conf. on Advances in CFD (2009).

ICOMEC-2011 Presentation on DNS in CFD by Prof. T. K. Sengupta, S. Bhaumik and Y. G. Bhumkar

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Announcements related to HPCL

Summer school at CISM, Udine, Italy during 21-25 May, 2018 on "High-Performance Computing of Big Data for Turbulence and Combustion" (Co-organizers: Sergio Pirozzoli and Tapan K. Sengupta)
CISM Summer School 2018.pdf

Visitors in 2017 to HPCL: Krishna Chand Avatar spent as a semester long intern (January to May), Lucas Lestandi came as the Raman-Charpak Fellow from Univ. of Bordeaux, France during 11th March to 11th June, 2017. Arijit Upadhyay from NIT Trichy visited HPCL during 15th May to 15th July. Photo

Next activity at HPCL will be a move to new sites in the campus. The aerospace building is going to be taken down to make room for a multi-story building. While these are on, TKS along with Prof. S. Amiroudine of Univ. of Bordeaux are busy organizing a workshop in Bordeaux on Advances in Fluid Mechanics. About thirty eminent scientists from both the countries will make presentation during 11-13 September, 2017. There is a plan to publish the proceedings. This is being supported by CEFIPRA.

Group photograph on 9th June 2017. Group photograph

We are trying to alert users of Adams-Bashforth method. This is a persistent problem in the subject and continues to plague many, who are unfortunately not very bothered! The role of spurious numerical mode which appears in all three-time level methods has been discussed in the following paper: AMC.pdf
Following audio-slide is for those fellow-scientists who wants to see the catastrophic breakdown of solution by the spurious mode. Here third order upwind scheme is used with Adams-Bashforth method. Rest is self-explanatory: AMC Audio slide viewer

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 at IIT Kanpur; 2) Kartikey Asthana has defended his PhD thesis at Stanford University; 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 was on sabbatical leave during 2015-2016. He has spent three months in Bordeaux during winter; the following summer in Univ. of Cambridge, UK as a Visiting Fellow of Murray-Edwards College and Univ. Engg. Dept, working with Prof. Paul Tucker and his team. Subsequently, he visited Univ. of Bordeaux, as the visiting IDEX Professor in I2M Laboratory, working with Prof. Mejdi Azaiez and others during September and October, 2016.

MHRD sponsored Global Initiative on Academic Network (GIAN) program was held in IIT Bhubaneswar conducted by Profs. Yogesh Bhumkar and Satyanarayana during May 23- June 03, 2016. The speakers were Prof. D. V. Gaitonde (OSU, USA) and Prof. Tapan Sengupta (HPCL, IIT Kanpur).
Title of the course: Computational Acoustics: Engineering and scientific approaches.

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 :


    HPCL HAS EXPLAINED FOCUSING - a numerical meltdown faced by many in diverse fields! The codes that run for very long time, suddenly blow up in a small time interval due to FOCUSING. In 1970's and 1980's this has been conjectured due to nonlinear instability, following reasoning by NA Phillips and J Smagorinsky. Some even attributed it to chaos dynamics. Present work is a follow up research mostly at HPCL and by Prof. Sagaut (then at UPMC) to investigate nonlinear numerical instability as a CEFIPRA project. In the research, spectral analysis of scientific computing was put forward for 1D convection equation, and noting why von Neumann analysis is inadequate -- this appeared in JCP (2007). The Global Spectral Analysis (GSA) have never disappointed! GSA has been used subsequently for: 2D Convection equation, diffusion equation, convection-diffusion equation, shallow water equation, KdV equation. Many phenomena have been explained in last ten years, and recently we have explained "focusing"! In Dec. 2014, work on focusing was restarted for 3-time level methods by a challenge by a professor from Princeton! We responded in AMC (2017) using GSA of 3-time level methods, mainly Adams-Bashforth method. Recently work in Computers and Fluids, shows how focusing is explained by GSA, establishing focusing as a linear phenomenon.

Visitors in 2018: Sahil Bhola from Thapar Univ.; Tanay Kanungo from NIT Trichy, Ashwin Joseph from NIT Calicut will spend the summer. Aditi has come and spent two short vacations in HPCL and collaborated with Nidhi and Suman (now a PhD candidate from NAL Bangalore).

Visitors in HPCL (2016/17): Lucas Lestandi came as one of the seven Raman-Charpak Fellows from France to various Indian institutes/ universities. G. R. Krishna Chand Avatar spent a semester at HPCL from Punjab Engineering College and worked with Lucas on various aspects of DNS, POD and ROM. Prof. Swagata Bhaumik spent nine months at HPCL.

Work started at HPCL in 2015: Dr. Manoj Rajpoot, Aditi, Nidhi, Roshan and Prayash Panda started study of compact schemes for non-uniform grids. Paper by Aditi Sengupta and TKS has appeared in JCP in 2016. Sixth order scheme by Nidhi Sharma, Aditi Sengupta, Roshan Samuel, Manoj Rajpoot, TK Sengupta has appeared in Computers and Fluids (2017). This should boost research on IBM. We have also reported properties of methods and filters using unstructured grid methods, by GSA.

We have taken up the challenge in providing more accurate results for Rayleigh-Taylor instability by avoiding Boussinesq approximation. We avoid Stokes' hypothesis, by incorporating bulk viscosity for Navier-Stokes equation, another first from HPCL. We have published work on non-equilibrium thermodynamical aspect of RTI and removed Stokes hypothesis in our papers: Int. J. of Thermodynamics, Physics of Fluids, CPC proceedings.

Dr. Swagata Bhaumik is back in HPCL, after his stay in OSU with Prof. Gaitonde. Biswajit Ghosh and Emayvarman are two PhD candidates joining HPCL. Prasanna, Deepak, Netrapal and Shamini have joined HPCL for M. Tech. thesis.

Other News:
Zulqarnain is working in Bangalore; Jyoti has joined Eton; Atchyut is in Bangalore with Mercedez; Akhil is with Rolls Royce; Ijlal is placed with Airbus. Nilesh is teaching in Pune/ Mumbai. Prasoon and Soumyo are in Georgia Tech. Dynamic stall work of Prasoon is not new in HPCL, but is very accurate now. 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. Nidhi and Roshan have developed a 3D compressible ILES code for 3D RTI. Vikram Singh (2009 BT-MT) has joined Technion for his PhD. Pushpendra Sharma (PhD student) is working on DNS/LES of 3D external and internal flows. He also plans to work on reduced order model - a collaboration with Univ. of Bordeaux. Biswajit and Deepak are working on rotary oscillation and bypass transition. We are revisiting vortex-induced instability using 3D V-Omega formulation. Biswajit is also looking at Taylor-Couette flow. Varman is working on 3D flow past cylinder. We plan to look at this problem with real high accuracy methods. We have also now a vorticity-vector potential code for a working Navier-Stokes solver, a first for us!

Pramod is now senior faculty member in Univ. of Pune; Yogesh leads a team at IIT Bhubaneswar; Dr. A Kameshwar Rao is at IIT Madras (Mech. Engg.); Prof. Manoj T. Nair is at IIST in Thiruvananthapuram; Dr. Sudipta De is at CMERI Durgapur and Prof. K. Venkatasubbaiah is in IIT Hyderabad. Other senior members of HPCL: Sarthok Sircar is a faculty at IIIT Delhi; Anurag Dipankar is in Singapore. Rajarshi is doing his PhD at UPMC, Paris and Sreejith is doing his PhD at CERFACS, Tolouse with Prof. Thierry Poinsot. Vijay is doing his post-doc in Stanford. Shakti is in UIUC doing PhD, Unni has finished PhD at OSU, Columbus, Ohio, Ashwin VM is at KTH and Shriramakrishnan is in Univ. of Texas. Abir and Himansu have left Eaton; Pallavi and Lakshmanan are with GE (?). Kathikey Asthana has joined Credit Suisse in USA, after finishing his PhD with Prof. A. Jameson at Stanford. Vishal is doing is PhD at Univ. of Michigan working with Prof. Duraisamy. Vivek Joshi has also joined Univ. of Michigan in 2017.

Following works were presented at conferences/ workshops in 2015: i) 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.

    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 details about the proceedings from WSPC is at:

    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

    "Diffusion in inhomogeneous flows: Unique equilibrium state in an internal flow," Tapan K. Sengupta, Himanshu Singh, Swagata Bhaumik, Rajarshi Roy Chowdhury. A major work shows how small scales are created by diffusion for 2D/3D inhomogeneous flows, from Navier-Stokes equation without any assumptions. This mechanism is much stronger than vortex stretching for 3D flows. For 2D flows, this is the only mechanism. For inhomogeneous flows this is, thus, more general than any other existing ideas!

    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. See:

    Swagata Bhaumik's PhD 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) is available as NPTEL course. Similar video course on Transition and Turbulence is also available. Ignore the transcription on screen - those were not done by us!

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

    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.

    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 5th M.I.T. conference, 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, diffusion equation and convection-diffusion equation now. See the following papers:

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

b) Error dynamics of diffusion equation: Effects of numerical diffusion and dispersive diffusion -- T.K. Sengupta and A. Bhole, Journal of Computational Physics, vol. 266, pp 240-251 (2014)

c) Spectral analysis of finite difference schemes for convection diffusion equation-- V.K. Suman, Tapan K. Sengupta, C. J.Durga Prasad, K. Surya Mohan, D. Sanwalia, Computers and Fluids, vol. 150, pp 95-114 (2017)