All Stories

  1. Retraction: “Universal benchmark data of the three-dimensional boundary layer blockage and average friction coefficient for in silico code verification” [Phys. Fluids 34, 041301 (2022)]

    Article • Physics of Fluids, August 2025, American Institute of Physics

    Dr. SANAL KUMAR VR

  2. Advancing Magnetohydrodynamic Propulsion for Sustainable and Efficient Space Exploration

    Article • July 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  3. Microbubble Nucleation and Acoustic Softening Trigger Multiphase Sanal Flow Choking and Shock Waves in Liquid Rockets

    Article • July 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Arpita Dutta , Shivansh Rana, Vinay Dekkala , Dr. SANAL KUMAR VR, Sanjay Singh

  4. In Vitro Microbubble Nucleation and Sanal Flow Choking Induced Combustion Instabilities in Liquid Rocket Propulsion

    Article • July 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Arpita Dutta , Vinay Dekkala , Sanjay Singh, Dr. SANAL KUMAR VR, Shivansh Rana

  5. Enhancing Scramjet Combustion: Leveraging Shockwave-Fuel Interactions for Improved Mixing

    Article • July 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Swaraj Patil, Dr. SANAL KUMAR VR

  6. In Silico Study of Obstruction-Induced Spray Modulation in Injector Nozzles for Enhanced Atomization

    Article • July 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Karma Yangdon, Dr. SANAL KUMAR VR

  7. Experimental Validation of Dual-Head Electromagnetic Propulsion Through Rack and Pinion Integration

    Article • July 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Swaraj Patil, Dr. SANAL KUMAR VR

  8. In-Silico Analysis of Acoustic Wave Backpropagation Through Nozzle Boundary Layers of Rocket Motors at Liftoff

    Article • July 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Shivansh Rana, Dr. SANAL KUMAR VR

  9. In Silico Evaluation of Sonic Ring Standoff and Trailing Edge Expansion on Hypersonic Waverider Performance

    Article • July 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Shivansh Rana, Dr. SANAL KUMAR VR

  10. Unraveling Microbubble Nucleation and Sanal Flow Choking in Dual-thrust Hybrid Rockets: The Sonic Mach Equation Determines DDT Threshold

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Sanjay Singh, Dr. SANAL KUMAR VR

  11. Enhancing Rocket Control with Pintle Nozzles

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Vinay Dekkala , Dr. SANAL KUMAR VR, Vedika Garg, Swaraj Patil

  12. Curved Strut Wall Effects in Scramjet Combustion

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Vinay Dekkala , Dr. SANAL KUMAR VR, Vedika Garg, Swaraj Patil

  13. Continuous Electromagnetic Push-Pull Propulsion

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Vinay Dekkala , Dr. SANAL KUMAR VR, Sanjay Singh, Vedika Garg, Swaraj Patil

  14. Enhancing Scramjet Combustor Efficiency Through Strut-Based Multi-Point Fuel Injection: In silico Analysis Utilizing the SST k-ω Model

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  15. A Design Trade-Off of Mixture Ratio of Liquid Rocket Engine

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Shivansh Rana, Dr. SANAL KUMAR VR, Debayan Roy

  16. Optimizing High-Performance Dual-Thrust Hybrid Rocket Systems in Vacuum: Mitigating Sanal Flow Choking by Spraying High Heat Capacity Nano-Granules

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Dhruv Panchal, Dr. SANAL KUMAR VR, Sanjay Singh

  17. Angled Fuel Injection and Strut Design in Scramjets

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Vedika Garg, Swaraj Patil

  18. The Coanda Effect Unveiled: Compressible and Viscous Flow Dynamics in Aerodynamics and Coaxial Jet Mixing

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Shivansh Rana, Dr. SANAL KUMAR VR

  19. A Novel Gas Injection Blending Technique to Mitigate the Aerodynamic Heating in High-Speed Flows

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Vinay Dekkala , Dr. SANAL KUMAR VR

  20. Increasing Sonic Ring Standoff Distance Reduces Aerodynamic Heating With High Heat Capacity Fluid Injection

    Article • January 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Vinay Dekkala , Dr. SANAL KUMAR VR

  21. Revolutionizing Aircraft Oversight: A Unified Method to Technical Surveillance and Auditing for Global Aviation Regulatory Authorities

    Article • July 2024, American Institute of Aeronautics and Astronautics (AIAA)

    Manoj Kumar Paidisetty, Om Prakash, Dr. SANAL KUMAR VR

  22. In Silico Studies of the Upturned Wing Tip Aerodynamics for the Design Optimization of Multiple Winglets With Variable Cant Angles for Transonic Aircraft

    Article • July 2024, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Manoj Kumar Paidisetty, Vinay Dekkala , Arpita Dutta

  23. Investigation of Area Ratios in Convergent-Divergent Streamlines for Assessing Transonic Aerodynamic Performance Across Varied AoA in Different Airfoils

    Article • July 2024, American Institute of Aeronautics and Astronautics (AIAA)

    Manoj Kumar Paidisetty, Dr. SANAL KUMAR VR, Vinay Dekkala , Shivansh Rana

  24. In Silico Design of Detonation-Free High-Performance Dual-Thrust Solid and Hybrid Propellant Rockets Through the Application of the Chapman–Jouguet Condition

    Article • July 2024, American Institute of Aeronautics and Astronautics (AIAA)

    Manoj Kumar Paidisetty, Dr. SANAL KUMAR VR, Sanjay Singh, Ria Dey, Vinay Dekkala , Dhruv Panchal, Shivansh Rana

  25. Design Optimization of a Waverider to Enhance the Aerodynamic Efficiency

    Article • July 2024, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Manoj Kumar Paidisetty, Vinay Dekkala , Shivansh Rana

  26. State of the Art Digital Accountable and Customizable Aircraft Transit Inspection/Line Maintenance Toolbox for Enhancing the Aircraft Safety

    Article • January 2024, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Manoj Kumar Paidisetty, Sanjay Singh

  27. Erratum: “A closed-form analytical model for predicting 3D boundary layer displacement thickness for the validation of viscous flow solvers” [AIP Adv. 8, 025315 (2018)]

    Article • AIP Advances, April 2023, American Institute of Physics

    Dr. SANAL KUMAR VR

  28. How air bubbles in blood can choke arteries and trigger shock waves in heart and brain vessels

    Article • Physics of Fluids, October 2022, American Institute of Physics

    Dr. SANAL KUMAR VR

  29. Benchmark Data to Predict Flow Blockage and Friction in Pipes for Accurate Fluid Simulations

    Article • Physics of Fluids, April 2022, American Institute of Physics

    Dr. SANAL KUMAR VR

  30. The Effects of Ground Clearance and Boundary Layer Blockage Factor on the Aerodynamics Performance of the Hyperloop Pod and Transonic Ground-Effect Aircraft

    Article • July 2021, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  31. How ground proximity causes flow choking and shock waves under fast-moving aircraft

    Article • Physics of Fluids, March 2021, American Institute of Physics

    Dr. SANAL KUMAR VR

  32. Nanoscale Flow Choking and Spaceflight Effects on Cardiovascular Risk of Astronauts – A New Perspective

    Article • January 2021, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, VIGNESHWARAN SANKAR

  33. Deflagration to Detonation Transition in Chemical Rockets with Sudden Expansion/Divergence Regions

    Article • August 2020, American Institute of Aeronautics and Astronautics (AIAA)

    Mr Roshan Vignesh Baskaran, Thianesh Urumandampalayam Krishnan, Dr. SANAL KUMAR VR, Mohan E

  34. Design Optimization of Dump Diffusers with NACA 66-021 Shaped Flame Tube

    Article • August 2020, American Institute of Aeronautics and Astronautics (AIAA)

    SUNDARARAJ K, Dr. SANAL KUMAR VR

  35. Genome Approach and Data Science Methods for Accelerated Discovery of New Solid Propellants with Desired Properties

    Article • August 2020, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Alexander N Lukin, Thianesh Urumandampalayam Krishnan, Charlie Oommen, Dr. SANAL KUMAR VR

  36. The Application of Energetic Materials Genome Approach for Development of the Solid Propellants Through the Space Debris Recycling at the Space Platform

    Article • August 2020, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Alexander N Lukin, Dr. SANAL KUMAR VR

  37. Conceptual Design and Contour Optimization of Altitude Compensation Nozzles for SSTO Vehicles

    Article • August 2020, American Institute of Aeronautics and Astronautics (AIAA)

    Thianesh Urumandampalayam Krishnan, Dr. SANAL KUMAR VR

  38. Design of Pre-diffuser Cone for Dump Diffusers for Aero Gas Turbine Engines

    Article • August 2019, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, SUNDARARAJ K

  39. Studies on Flame Spread Acceleration and Detonation Kernel in a Dual-thrust Rocket

    Article • August 2019, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, VIGNESHWARAN SANKAR, Charlie Oommen, Ragupathi S

  40. A Conceptual Method to Recycle Space Debris into Fuels and Artificial Soil in the ISS for Numerous Applications

    Article • August 2019, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  41. Experimental and Numerical Studies on Jet Acoustic Characteristics of Chevron Nozzles

    Article • August 2019, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Darshana Shanmughasundaram, Thianesh Urumandampalayam Krishnan, SUNDARARAJ K, Sivaguru J, Vasanthakumar J

  42. External Flow Choking at the Landing Phase of Aircraft and Re-entry Vehicles

    Article • August 2019, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  43. electromagnetic piston engine

    Article • August 2019, American Institute of Aeronautics and Astronautics (AIAA)

    Mr. Ashish Kumar, Dr. SANAL KUMAR VR, Thianesh Urumandampalayam Krishnan

  44. Development of the Multifactorial Computational Models of the Solid Propellants Combustion by Means of Data Science Methods –Phase III

    Article • August 2019, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Alexander N Lukin, Charlie Oommen, Dr. SANAL KUMAR VR

  45. Design of an Uninterrupted Propulsion System for Spinning Planet Landers for Soft Landing

    Article • January 2019, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr. Ashish Kumar

  46. Modeling of Sanal Flow Choking Condition and Design Optimization of High Performance Dual-thrust SRMs

    Article • July 2018, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr Roshan Vignesh Baskaran

  47. Prediction of 3D Boundary Layer Blockage and the Grain Design Optimization of HVT Dual-thrust Hybrid Rockets

    Article • July 2018, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr Roshan Vignesh Baskaran

  48. Studies on 2D and 3D Boundary layer Blockage and External Flow Choking at Moving Wing in Ground Effect

    Article • June 2018, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr Roshan Vignesh Baskaran

  49. Boundary layer Blockage, Venturi Effect and Cavitation Causing Aerodynamic Choking and Shock Waves in Human Artery Leading to Hemorrhage and Massive Heart Attack – A New Perspective

    Article • June 2018, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr Roshan Vignesh Baskaran

  50. A Closed-form Analytical Model for Predicting 2D Boundary layer thickness for Verification, Calibration and Validation of Navier-Stokes Solvers

    Article • June 2018, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr Roshan Vignesh Baskaran

  51. Mechanical Characterization of a Thick-Walled Viscoelastic Hollow Cylinder under Multiaxial Stress Conditions

    Article • Materials Science Forum, March 2018, Trans Tech Publications

    Dr. SANAL KUMAR VR

  52. RETRACTED: A closed-form analytical model for predicting 3D boundary layer displacement thickness for the validation of viscous flow solvers

    Article • AIP Advances, February 2018, American Institute of Physics

    Mr Roshan Vignesh Baskaran, Dr. SANAL KUMAR VR

  53. Dual-head Electromagnetic Variable Sweeping Speed Space Broom for Space Debris Mitigation

    Article • September 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr Sharad Sharan, Mr. Ashish Kumar

  54. Parametrical Optimization of a three-dimensional Dump Diffuser with Aerodynamically-shaped Flame Tube for Modern Aircraft Engines

    Article • July 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  55. Design of Environmental Friendly Chevron Nozzles for Lower Stage Rockets

    Article • July 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, VIGNESHWARAN SANKAR, Vivek Srinivasan, Sathyaprabha Rakkimuthu

  56. Design Optimization and Performance Evaluation of A Monopropellant Satellite Thruster

    Article • July 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr Sharad Sharan, Mr. Pradeep Kumar Pavalavanni

  57. Studies on Boundarylayer Blockage and External Flow Choking at Moving Wing in Ground Effect

    Article • July 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Vivek Srinivasan

  58. Diagnostic Investigation of Nozzle Flow Choking Time and Stage Separation Sequence of a Multi-stage Rocket

    Article • July 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, VIGNESHWARAN SANKAR, Anbarasan Sekar, Mr Sharad Sharan, Mr. Ashish Kumar

  59. Thrust Vectoring

    Article • July 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, VIGNESHWARAN SANKAR, Mr Sharad Sharan

  60. Performance Evaluation of Aerospike Nozzles for Lucrative Thrust Vector Control

    Article • July 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Vivek Srinivasan

  61. 3D Flame Spread and Starting Transient in Dual-thrust Solid Propellant Rocket Motors

    Article • July 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Mr Sharad Sharan

  62. Statistical Studies on Space Launches and the need for Active Debris Removal System

    Article • August 2015, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  63. Three-dimensional Jet Acoustic Characterization and Geometry Optimization of Chevron Nozzles

    Article • July 2015, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  64. 3D Flow Visualization and Geometry Optimization of Cavity based Scramjet Combustors using k-ω Model

    Article • July 2015, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  65. Influence of Starting Chamber Dynamics on Nozzle Flow Choking Time and the Liftoff Time of Dual-thrust Rockets

    Article • July 2015, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  66. Diagnostic Investigation of Flame Spread Mechanism in Dual-thrust Solid Propellant Rocket Motors

    Article • July 2015, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  67. Conceptual Design and Testing of a Dual-thrust Dual-head Electromagnetic Space Exploration Probe

    Article • July 2014, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR, Vijil V k Lal

  68. Numerical Simulation of Biology-Inspired Beetle Wings at Various Flying Conditions

    Article • July 2014, American Institute of Aeronautics and Astronautics (AIAA)

    Mr kishore girishankar , Dr. SANAL KUMAR VR, Mr Vijayakumar Mathaiyan

  69. Phenomenological Introduction of Propulsion Aspect of External Flow Choking at Wing in Ground Effect

    Article • July 2014, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  70. 3D Flow Simulation of Dual Thrust Solid Rocket Motors during Starting Transient

    Article • July 2014, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  71. Diagnostic Investigation of Flow field Characteristics of Cavity based Scramjet Combustors

    Article • July 2014, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  72. Studies on Gravity Influence on Solid Propellant Burn Rate

    Article • Applied Mechanics and Materials, November 2012, Trans Tech Publications

    Dr. SANAL KUMAR VR

  73. Studies on Ignition Delay and Flame Spread in High-Performance Solid Rocket Motors

    Article • Applied Mechanics and Materials, November 2012, Trans Tech Publications

    Dr. SANAL KUMAR VR

  74. Studies on Aerodynamic Characteristics of Dump Diffusers for Modern Aircraft Engines

    Article • Applied Mechanics and Materials, November 2012, Trans Tech Publications

    Dr. SANAL KUMAR VR

  75. Ignition Transient of Dual-Thrust Solid Propellant Rocket Motors - A Review

    Article • July 2012, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  76. An Attempt to Correlate Collision Theory with Aerodynamic Lift

    Article • June 2012, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  77. Chemical Rocket Propulsion

    Article • International Journal of Aerospace Engineering, January 2012, Hindawi Publishing Corporation

    Dr. SANAL KUMAR VR

  78. Studies on Fluidic Injection Thrust Vectoring in Aerospike Nozzles

    Article • January 2011, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  79. Studies on Space Debris Tracking and Elimination

    Article • July 2010, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  80. Studies on Internal Ballistics of Dual-thrust Motors for Nozzleless Propulsion

    Article • July 2010, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  81. Aerodynamic Sound Reduction for Silent Aircraft

    Article • January 2008, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  82. Numerical Simulation of Transient Flows in Inert Simulators of Solid Rocket Motors

    Article • July 2007, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  83. Power Generation for Manned Space Mission

    Article • June 2007, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  84. Evaluation of Dynamic Burn Rate from the Extinction Compliance of Solid Rocket Motors

    Article • Journal of Spacecraft and Rockets, March 2007, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  85. Studies on Internal Flow Choking in Dual-Thrust Motors

    Article • Journal of Spacecraft and Rockets, September 2006, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  86. Starting Transient Flow Phenomena in Inert Simulators of Solid Rocket Motors with Divergent Ports

    Article • Journal of Propulsion and Power, September 2006, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  87. Studies on Flow Characteristics of Variable Ejector Systems

    Article • July 2006, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  88. Diagnostic Investigation of Dump Gap Effects on Flow Features of Dump Diffusers

    Article • July 2006, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  89. Fluid-Throat-Induced Shock Waves During the Ignition Transient of Solid Rockets

    Article • Journal of Spacecraft and Rockets, January 2006, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  90. Insulation Qualification Studies for Cryogenic Rockets

    Article • July 2005, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  91. Studies on Ejector Systems for Hydrogen Fuel Cell

    Article • July 2005, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  92. A Phenomenological Introduction of Fluid-Throat in High-Velocity Transient Motors

    Article • July 2005, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  93. A Classical Evaluation of the Thermophysical Properties of Insulators for Cryogenic Rockets

    Article • July 2005, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  94. Diagnostic Investigation of Instabilities and Pressure Oscillations in High-Performance Solid Rockets

    Article • July 2005, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  95. Characterization of Dump Diffusers using a k-e Turbulence Model

    Article • January 2005, Begell House

    Dr. SANAL KUMAR VR

  96. Thermoviscoelastic Characterization of a Composite Solid Propellant Using Tubular Test

    Article • Journal of Propulsion and Power, May 2003, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR

  97. Flame Spread with Sudden Expansions of Ports of Solid Propellant Rockets

    Article • Journal of Propulsion and Power, January 2001, American Institute of Aeronautics and Astronautics (AIAA)

    Dr. SANAL KUMAR VR