Qualification: 
Ph.D
Email: 
r_balajee@cb.amrita.edu

Dr. Balajee Ramakrishnananda got his Doctoral Degree from Nanyang Technological University, Singapore, in 1997. His doctoral thesis work centered around the computational study of flow through a centrifugal vaned diffuser used in transonic flow regimes.

He obtained his Masters degree from IISc, Bangalore and B. Tech. from IIT, Madras. Prior to joining Amrita, he was working as a Software Engineering Manager at AMD, Hyderabad in the area of GPGPU Computing.

Dr. Balajee had also worked as a Scientist-B at National Aerospace Laboratories, Bangalore in the area of Transonic Wind Tunnel Testing. He has worked for several years in the Military & Flight Simulation fields in product development and managerial roles. He had also worked on physics based animation where he placed aerodynamics and flight mechanics of birds in a perspective suited for computer animation. 

Areas of Research

  • Micro Aerial Vehicles
  • Wind Turbines
  • Applied Computational Fluid Dynamics
  • Hypersonic Flow
  • Propulsion
  • Compressible Fluid Flow
     

Research Activities

  • PhD guidance
  • Currently guiding one PhD student
  • Co-guide for another PhD student
     

Funded Projects

  • Coking in Semi-cryogenic Engines: Studies on Predicting the Onset of Coking in a Heated Tube      with Isrosene / Kerosene, ISRO funded project (Co-PI)
  • Effusion Cooling for Gas Turbine Combustors: Studies on Enhancement of Cooling Effectiveness by Design Improvisation, GTRE funded project (Co-PI)
     

Publications

Publication Type: Journal Article

Year of Publication Publication Type Title

2017

Journal Article

T. R. S. Kumar, Dr. Sivakumar V., Dr. Balajee Ramakrishnananda, Arjhun, A. K., and , “Numerical investigation of two element camber morphing airfoil in low reynolds number flows”, Journal of Engineering Science and Technology, vol. 12, pp. 1939-1955, 2017.[Abstract]


Aerodynamic performance of a two-element camber morphing airfoil was investigated at low Reynolds number using the transient SST model in ANSYS FLUENT 14.0 and eN method in XFLR5. The two-element camber morphing concept was employed to morph the baseline airfoil into another airfoil by altering the orientation of mean-line at 35% of the chord to achieve better aerodynamic efficiency. NACA 0012 was selected as baseline airfoil. NACA 23012 was chosen as the test case as it has the camber-line similar to that of the morphed airfoil and as it has the same thickness as that of the baseline airfoil. The simulations were carried out at chord based Reynolds numbers of 2.5×105 and 3.9×105. The aerodynamic force coefficients, aerodynamic efficiency and the location of the transition point of laminar separation bubble over these airfoils were studied for various angles of attack. It was found that the aerodynamic efficiency of the morphed airfoil was 12% higher than that of the target airfoil at 4° angle of attack for Reynolds number of 3.9×105 and 54% rise in aerodynamic performance was noted as Reynolds number was varied from 2.5×105 to 3.9×105. The morphed airfoil exhibited the nature of low Reynolds number airfoil. © School of Engineering, Taylor’s University.

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2015

Journal Article

Dr. Balajee Ramakrishnananda, Krishnamurthy, V., Venkatraman, N., Hari, N. Nurani, Varaparla, A., and T. Kumar, R. Senthil, “Computational study of the aerodynamics of the gliding snake Chrysopelea Paradisi”, 1st International Conference on Advanced Engineering and Technology for Sustainable development (ICAETSD - 2015), vol. 5, 2015.

2015

Journal Article

P. Pulikkul Purushothaman, Shankar, R. Ravi, Hariharan, S. K., G. Siddhardha, M., and Dr. Balajee Ramakrishnananda, “Design of a new aerofoil for low starting wind speeds for a small VAWT”, ”, 1st International Conference on Advanced Engineering and Technology for Sustainable development (ICAETSD - 2015), vol. 10, no. 19, pp. 14480-14484, 2015.

1999

Journal Article

Dr. Balajee Ramakrishnananda and Wong, K. C., “Animating bird flight using aerodynamics”, SIGGRAPH 99 Conference Abstracts and Applications, vol. 15, pp. 494-508, 1999.

1995

Journal Article

Dr. Balajee Ramakrishnananda and Damodaran, M., “Numerical Study of Viscous Compressible Flow Inside Planar and Axisymmetric Nozzles”, Lecture Notes in Physics, vol. 453, pp. 508-512, 1995.

Publication Type: Conference Paper

Year of Publication Publication Type Title

2016

Conference Paper

V. Sujjur Balaramraja, S. Sankrityayan, E., Sivagurunathan, S. Coimbatore, Dr. Balajee Ramakrishnananda, and T. Kumar, R. Senthil, “Modelling the Undulation Patterns of Flying Snakes”, in International Conference on Advances in Computing, Jaipur, India, 2016.

2015

Conference Paper

V. Saxena, Dr. Balajee Ramakrishnananda, and Kumar, T. R. S., “Simulation of flow past a wing inspired by flying snakes”, in 2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015, 2015, pp. 720-725.[Abstract]


Wings of airplanes, ornithopters and micro-aerial vehicles were inspired by the wings of birds and insects. A flying snake found in South and South-East Asia converts its entire body into a morphing wing which AIDS it to glide very efficiently. The aerodynamics of this species of snake is not well understood. Two dimensional computational and experimental studies of the snake's rather unusual cross-section have been done in earlier works. A three dimensional simulation of the flow over a wing inspired by the snake's body geometry is solved in the current work using steady laminar assumptions. Solutions were obtained from an angle of attack of 0 to 55 degrees in steps of 5 degrees. Interesting features like wake interaction with downstream sections and complex vortex shapes come to light. At low angles of attack, transverse flows reduce the strength of the wake leaving the wing. Gentle stall characteristics with a high stall angle and almost linear increase in drag with angle of attack are noticed. Bending of streamlines indicative of high lift production are clearly visualized at the maximum lift condition. © 2015 IEEE.

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2015

Conference Paper

Dr. Balajee Ramakrishnananda, Krishnamurthy, V., Venkatraman, N., Hari, N. Nurani, Varaparla, A., and T. Kumar, R. Senthil, “Computational study of the aerodynamics of the gliding snake Chrysopelea Paradisi”, in 1st International Conference on Advanced Engineering and Technology for Sustainable development (ICAETSD - 2015), Karpagam College of Engineering, Coimbatore, 2015.

2015

Conference Paper

Dr. Balajee Ramakrishnananda, Purushothaman, P. Pulikkul, Shankar, R. Ravi, ,, and G. S.K., M. Siddhardha, “Design of a new aerofoil for low starting wind speeds for a small VAWT”, in 1st International Conference on Advanced Engineering and Technology for Sustainable development (ICAETSD - 2015), Karpagam College of Engineering, Coimbatore, 2015.

2014

Conference Paper

M. M., Venkata, R. Malla, Junaid, M. Abdul, Akash, R., and Dr. Balajee Ramakrishnananda, “Theoretical Optimization of Airfoils for Different Wind Turbine Conditions”, in International Conference on Contemporary Challenges in Management, Technology and Social Sciences(Also published as Handbook of Management, Technology and Social Sciences edited by S. Pandey and Jain Singh organized by SEMS and MGIMT, MGIMT, Lucknow, India, 2014.

2013

Conference Paper

Dr. Balajee Ramakrishnananda, Krishnan, R., RevathyPriya, R. R., Basavara, A., and Santhanam, S. Ganapathy, “Aerofoils for Small Vertical Axis Wind Turbines”, in National Conference on Wind Tunnel Testing (NCWT-03) [CD-ROM], Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala, India, 2013.

1999

Conference Paper

Dr. Balajee Ramakrishnananda and Wong, K. C., “Animating Bird Flight Using Aerodynamics”, in Technical Sketch, SIGGRAPH 99 Conference Abstracts and Application and ACM SIGGRAPH, Computer Graphics Annual Conference, Los Angeles, California, 1999.

1998

Conference Paper

Dr. Balajee Ramakrishnananda and C., W. K., “Litter Bug”, in SIBGRAPI '98 Video Festival, 1998 International Symposium of Computer Graphics, Image Processing and Vision, Rio de Janeiro, Brazil, 1998.

1994

Conference Paper

Dr. Balajee Ramakrishnananda and M., D., “Numerical Study of Viscous Turbulent Flow Through Planar and Axisymmetric Nozzles”, in 14th International Conference on Numerical Methods in Fluid Dynamics, Bangalore, India, 1994.

1994

Conference Paper

Dr. Balajee Ramakrishnananda and Damodaran, M., “Computational study of aerodynamic flows inside nozzles”, in International Pacific Air & Space Technology Conference, Singapore, 1994.[Abstract]


Compressible aerodynamic flows inside nozzles are computed by a finite volume method to numerically integrate the Euler and Navier-Stokes equations. The solution procedure is based on an explicit multi-stage time-stepping scheme wherein the spatial terms are central-differenced and a combination of second and fourth differences in the flow variables are used to construct numerical dissipation terms to enhance numerical stability. Convergence to steady state is accelerated dramatically by using local time-stepping, implicit residual smoothing and a multi-grid strategy. Computed results are presented for a wide variety of flow regimes comprising of subsonic, transonic, choked and supersonic flows for a nozzle.

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