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Journal Publications
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| 26. | Heinzen, S. B., Hall, C. E., and Gopalarathnam, A., “Development and Testing of a Passive Variable-Pitch Propeller,” Journal of Aircraft, In Press, available online in the early edition of the journal. DOI: 10.2514/1.C032595 Replaces: conference papers AIAA Paper 2010-62 and AIAA Paper 2012-1068. |
link to journal, preprint |
| 25. | Ramesh, K., Murua, J., and Gopalarathnam, A., “Limit-Cycle Oscillations in Unsteady Flows Dominated by Intermittent Leading-Edge Vortex Shedding,” Journal of Fluids and Structures, Vol. 55, May 2015, pp. 84-105. http://dx.doi.org/10.1016/j.jfluidstructs.2015.02.005 |
link to journal, pdf |
| 24. | Paul, R. C. and Gopalarathnam, A., “Iteration schemes for rapid post-stall aerodynamic prediction of wings using a decambering approach,” , International Journal of Numerical Methods in Fluids, Vol. 76, pages 199-222. doi: 10.1002/fld.3931 Coming soon: datasets from article |
link to journal, preprint |
| 23. | Kiran Ramesh, Ashok Gopalarathnam, Kenneth Granlund, Michael V. Ol and Jack R. Edwards, “Discrete-vortex method with novel shedding criterion for unsteady aerofoil flows with intermittent leading-edge vortex shedding,” Journal of Fluid Mechanics, Volume 751, July 2014, pp 500-538. DOI: http://dx.doi.org/10.1017/jfm.2014.297 Replaces: conference papers AIAA Paper 2011-3578 and AIAA Paper 2012-3027. Now available: The LDVM source code (LESP-modulated discrete vortex method) released under GPL, available for download Coming soon: datasets from article |
link to journal, pdf |
| 22. | Cusher, A. A. and Gopalarathnam, A., “Drag reduction on aircraft configurations with adaptive lifting surfaces,” Aerospace Science and Technology (Elsevier), April 2014, DOI: 10.1016/j.ast.2014.01.012. Replaces: conference paper AIAA Paper 2008-0296. Coming soon: datasets from article |
link to journal |
| 21. | Ramesh, K., Gopalarathnam, A., Edwards, J. R., Ol, M. V., and Granlund, K., “An unsteady airfoil theory applied to pitching motions validated against experiment and computation,” Theor. Comput. Fluid Dyn., January 2013, DOI 10.1007/s00162-012-0292-8. Replaces: conference paper AIAA Paper 2011-0217. Coming soon: datasets from article |
link to journal, pdf |
| 20. | Sriram, P.S., Gopalarathnam, A., and Misenheimer, A., “High-Downforce Airfoil Design for Motorsports,” SAE Int. J. Mater. Manf. 5(2):478-489, 2012, doi:10.4271/2012-01-1168. | link |
| 19. | Johnston, J. and Gopalarathnam, A., “Investigation of a bio-inspired lift-enhancing effector on a 2D airfoil,” Bioinspiration & Biomimetics, Vol. 7, No. 3, 2012, Bioinspir. Biomim. 7 (2012) 036003 (10pp). doi:10.1088/1748-3182/7/3/036003 | link |
| 18. | Cusher, A. A. and Gopalarathnam, A., “Drag Reduction Methodology for Adaptive Tailless Aircraft,” Journal of Aircraft, Vol. 49, No. 1, January-February 2012, pp. 161–172. doi: 10.2514/1.C031454 | |
| 17. | McGowan, G., Granlund, K., Ol, M., Gopalarathnam, A., and Edwards, J., “Investigations of Lift-Based Pitch-Plunge Equivalence for Airfoils at Low Reynolds Numbers,” AIAA Journal, vol.49 no.7, July 2011, pp. 1511–1524. doi: 10.2514/1.55036 | |
| 16. | Cox, C., Gopalarathnam, A., and Hall, C., “Flight Test of Stable Automated Cruise Flap for an Adaptive Aircraft Wing,” Journal of Aircraft, Vol. 47, No. 4, July-August 2010, pp. 1178–1188. doi: 10.2514/1.46789 | |
| 15. | Ol, M. V., Reeder, M., Fredberg, D., McGowan, G. Z., Gopalarathnam, A., and Edwards, J., “Computation vs. Experiment for High-Frequency Low-Reynolds Number Airfoil Plunge,” International Journal of Micro Air Vehicles, Vol. 1, No. 2, June 2009, pp. 99–119. DOI: 10.1260/175682909789498279. | link to journal |
| 14. | Gopalarathnam, A. and Norris, R.K., “Ideal Lift Distributions and Flap Angles for Adaptive Wings,” Journal of Aircraft, Vol. 44, No. 2, March-April 2009, pp. 562–571. doi: 10.2514/1.38713 | |
| 13. | Cox, C., Gopalarathnam, A., and Hall, C., “Development of Stable Automated Cruise Flap for an Aircraft with Adaptive Wing,” Journal of Aircraft, Vol. 44, No. 1, January-February 2009, pp. 301–311. doi: 10.2514/1.38684 | |
| 12. | Mukherjee, R. and Gopalarathnam, A., “Post-Stall Prediction of Multiple-Lifting-Surface Configurations Using a Decambering Approach,” Journal of Aircraft, Vol. 43, No. 3, May-June 2006, pp. 660–668. doi: 10.2514/1.15149 | |
| 11. | Jepson, J. and Gopalarathnam, A., “Inverse Design of Adaptive Airfoils with Aircraft Performance Considerations,” Journal of Aircraft, Vol. 42, No. 6, November-December 2005, pp. 1622–1630. | |
| 10. | King, R. and Gopalarathnam, A., “Ideal Aerodynamics of Ground-Effect and Formation Flight,” Journal of Aircraft, Vol. 42, No. 5, September-October 2005, pp. 1188–1199. | |
| 9. | Jepson, J. and Gopalarathnam, A., “Incorporation of Aircraft Performance Considerations in Inverse Airfoil Design,” Journal of Aircraft, Vol. 42, No. 1, January-February 2005, pp. 199–207. | |
| 8. | Frazier, J. and Gopalarathnam, A., “Optimum Downwash Behind Wings in Formation Flight,” Journal of Aircraft , Vol. 40, No. 4, July-August 2003, pp. 799–802. | |
| 7. | Gopalarathnam, A., Broughton, B., McGranahan, B. D., and Selig, M. S., “Design of Low Reynolds Number Airfoils with Trips,” Journal of Aircraft , Vol. 40, No. 4, July-August 2003, pp. 768–775. | |
| 6. | Mckay, N. and Gopalarathnam, A., “The Effects of Wing Aerodynamics on Race Vehicle Performance,” SAE 2002 Transactions, Journal of Passenger Cars: Mechanical Systems, pp. 2254–2263. | |
| 5. | McAvoy, C. W. and Gopalarathnam, A., “Automated Cruise Flap for Airfoil Drag Reduction over a Large Lift Range,” Journal of Aircraft, Vol. 39, No. 6, November-December 2002, pp. 981–988. Also see the conference paper (published after this journal paper was submitted) for wind-tunnel demonstration of closed-loop control. |
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| 4. | Gopalarathnam, A. and Selig, M. S., “A Hybrid Inverse Airfoil Design Method for Complex Three-Dimensional Geometries,” Journal of Aircraft, Vol. 39, No. 3, May-June 2002, pp. 409–417. | |
| 3. | Gopalarathnam, A. and McAvoy, C. W., “Effect of Airfoil Characteristics on Aircraft Performance,” Journal of Aircraft, Vol. 39, No. 3, May-June 2002, pp. 427–433. | |
| 2. | Gopalarathnam, A. and Selig, M. S., “Low-Speed Natural-Laminar-Flow Airfoils: Case Study in Inverse Airfoil Design,” Journal of Aircraft, Vol. 38, No. 1, January-February 2001, pp. 57–63. | |
| 1. | Gopalarathnam, A. and Selig, M. S., “Multipoint Inverse Method for Multielement Airfoil Design,” Journal of Aircraft, Vol. 35, No. 3, May-June 1998, pp. 398–404. |
Papers in Conference Proceedings
| 52. | Hirato, Y., Shen, M., Aggarwal, S., Gopalarathnam, A., and Edwards, J., “Initiation of Leading-Edge-Vortex Formation on Finite Wings in Unsteady Flow,” AIAA Paper 2015-0546, Proc. of the AIAA SciTech 2015 conference, Kissimmee, Florida, January 2015. | |
| 51. | Narsipur, S., Gopalarathnam, A., and Edwards, J. R., “A Time-Lag Approach for Prediction of Trailing-Edge Separation in Unsteady Flow,” AIAA Paper 2014-2701, Proc. of the AIAA Aviation 2014 Conference, Atlanta, GA, June 2014. | |
| 50. | Paul, R., Murua, J., and Gopalarathnam, A., “Unsteady and Post-Stall Aerodynamic Modeling for Flight Dynamics Simulation,” AIAA Paper 2014-0729, Proc. of the AIAA SciTech Conference, National Harbor, MD, January 2014. | |
| 49. | Ramesh, K., Gopalarathnam, A., Edwards, J. R., Granlund, K., and Ol, M., “Theoretical Analysis of Perching and Hovering Maneuvers,” AIAA Paper 2013-3194, Proc. of the 31st AIAA Applied Aerodynamics Conference, San Diego, CA, June 2013. | |
| 48. | Petrilli, J., Paul, R., Gopalarathnam, A., and Frink, N.T., “A CFD Database for Airfoils and Wings at Post-Stall Angles of Attack,” AIAA Paper 2013-2916, Proc. of the 31st AIAA Applied Aerodynamics Conference, San Diego, CA, June 2013. | |
| 47. | Gopalarathnam, A., Paul, R., and Petrilli, J., “Aerodynamic Modeling for Real-Time Flight Dynamics Simulation (Invited),” AIAA Paper 2013-0969, Presented at the 51st AIAA Aerospace Sciences Meeting, Grapevine, TX, January 7–10, 2013. | |
| 46. | Paul, R., and Gopalarathnam, A., “Simulation of Flight Dynamics with an Improved Post-Stall Aerodynamics Model,” AIAA Paper 2012-4956, AIAA Atmospheric Sciences Conference, Minneapolis, MN, August 13–16, 2012. | |
| 45. | Ramesh, K., Gopalarathnam, A., Granlund, K., Ol, M., and Edwards, J., “Theoretical Modeling of Leading Edge Vortices Using the Leading Edge Suction Parameter,” AIAA Paper 2012-3027, 30th AIAA Applied Aerodynamics Conference, New Orleans, LA, June 25–28, 2012. | Revised and published as journal paper #23 |
| 44. | Ramesh, K., Ke, J., Gopalarathnam, A., and Edwards, J., “Effect of Airfoil Shape and Reynolds Number on Leading Edge Vortex Shedding in Unsteady Flows,” AIAA Paper 2012-3025, 30th AIAA Applied Aerodynamics Conference, New Orleans, LA, June 25–28, 2012. | |
| 43. | Sriram, P., Gopalarathnam, A., and Misenheimer, A., “High-Downforce Airfoil Design for Motorsports,” SAE Paper 2012-01-1168, SAE 2012 World Congress, April 24, 2012, Detroit, MI. | Published as journal paper #20 |
| 42. | Heinzen, S., Hall, C., and Gopalarathnam, A., “Testing of the Passively Varying Propeller Concept,” AIAA Paper 2012-1068, 50th AIAA Aerospace Sciences Meeting, Nashville, TN, January 9–12, 2012. Revised version in review with the Journal of Aircraft. | Revised and published as journal paper #26 |
| 41. | Johnston, J. M., Gopalarathnam, A., and Edwards, J., “Experimental Investigation of Bio-Inspired High Lift Effectors on a 2-D Airfoil,” AIAA Paper 2011-3791, AIAA Applied Aerodynamics Conference, June 27–30 2011, Honolulu, HI. | Revised and published as journal paper #19 |
| 40. | Ramesh, K., Gopalarathnam, A., Ol, M. V., Granlund, K., and Edwards, J. R., “Augmentation of Inviscid Airfoil Theory to Predict 2D Unsteady Vortex Dominated Flows,” AIAA Paper 2011-3578, 41st AIAA Fluid Dynamics Conference, June 27–30 2011, Honolulu, HI. | Revised and published as journal paper #23 |
| 39. | Ramesh, K., Gopalarathnam, A., Edwards, J. R., Ol, M. V., and Granlund, K., “Theoretical, Computational, and Experimental Studies of a Flat Plate Undergoing High-Amplitude Pitching Motion,” AIAA Paper 2011-0217, 49th AIAA Aerospace Sciences Meeting, 4–7 January 2011, Orlando, FL. | Revised and published as journal paper #21 |
| 38. | Balu, A., Gopalarathnam, A., and Yuan, F. G., “A Superposition Theory for Efficient Computation of Approximate Lift Distributions on HAWT Rotor Blades,” AIAA Paper 2011-0148, Proc. of the ASME Wind Energy Symposium, held at the 49th AIAA Aerospace Sciences Meeting, 4–7 January 2011, Orlando, FL. | |
| 37. | Sutton, M., and Gopalarathnam, A., “A Rapid Aerodynamic Prediction Method for Simulation of Post-Stall Flight Dynamics,” AIAA Paper 2010-8123, AIAA Atmospheric Flight Mechanics Conference, Toronto, Canada, 2–5 August 2010. | |
| 36. | Granlund, K.; McGowan, G.; Ol, M.; Gopalarathnam, A.; Edwards, J., “The validity bounds of analytical force and moment predictions for pitch- and plunge oscillating low Reynolds number airfoils,” AIAA Paper 2010-8126, AIAA Atmospheric Flight Mechanics Conference, Toronto, Canada, 2–5 August 2010. | Revised and published as journal paper # 17 |
| 35. | Heinzen, S., Hall, C., and Gopalarathnam, A., “Passively Varying Pitch Propeller for Small UAS,” AIAA Paper 2010-62, 48th AIAA Aerospace Sciences Meeting, Orlando, Florida, January 4–7, 2010. Revised version in review with the Journal of Aircraft. | Revised and published as journal paper #26 |
| 34. | Cox, C., Gopalarathnam, A., and Hall, C. E., Jr., “Flight Test of Stable Automated Cruise Flap for an Adaptive Wing Aircraft,” AIAA Paper 2009-5728, Proc. of the AIAA Atmospheric Flight Mechanics Conference, Chicago, IL, 10–13 August, 2009. | Revised and published as journal paper # 16 |
| 33. | McGowan, G., Gopalarathnam, A., Ol, M., and Edwards, J., “Analytical, Computational, and Experimental Investigations of Equivalence Between Pitch and Plunge Motions for Airfoils at Low Reynolds Numbers,” AIAA Paper 2009-0535, Proc. of the 47th AIAA Aerospace Sciences Meeting, Orlando, FL, 5–8 January, 2009. | Revised and published as journal paper # 17 |
| 32. | Gopalarathnam, A. and Segawa, H., “Use of Lift Superposition for Improved Computational Efficiency of Wing Post-Stall Prediction,” AIAA Paper 2008-7049, Proc. of the 26th AIAA Applied Aerodynamics Conference, Honolulu, HI, 18–21 August, 2008. | |
| 31. | McGowan, G., Gopalarathnam, A., Ol, M., Edwards, J., and Fredberg, D., “Computation vs. Experiment for High-Frequency Low-Reynolds Number Airfoil Pitch and Plunge,” AIAA Paper 2008-0653, Proc. of the 46th AIAA Aerospace Sciences Meeting, Reno, NV, 7–10 January, 2008. | |
| 30. | Segawa, H. and Gopalarathnam, A., “Optimum Flap Angles for Roll Control on Wings with Multiple Trailing-Edge Flaps,” AIAA Paper 2008-0319, Proc. of the 46th AIAA Aerospace Sciences Meeting, Reno, NV, 7–10 January, 2008. | |
| 29. | Cusher, A. and Gopalarathnam, A., “Drag Reduction on Aircraft Configurations with Adaptive Lifting Surfaces,” AIAA Paper 2008-0296, Proc. of the 46th AIAA Aerospace Sciences Meeting, Reno, NV, 7–10 January, 2008. | Revised and published as journal paper # 22 |
| 28. | Cox, C., Gopalarathnam, A., and Hall, C. E., Jr., “Development of Stable Automated Cruise Flap for an Aircraft with Adaptive Wing,” AIAA Paper 2008-0206, Proc. of the 46th AIAA Aerospace Sciences Meeting, Reno, NV, 7–10 January, 2008. | Revised and published as journal paper # 13 |
| 27. | Jepson, J. and Gopalarathnam, A., “Experimental Demonstration of a Sense-and-Adapt Approach for Automated Adaptation of a Wing with Multiple Trailing-Edge Flaps,” AIAA Paper 2007-4062, Proc. of the 25th AIAA Applied Aerodynamics Conference, Miami, FL, 25–28 June, 2007. | |
| 26. | Cox, C., Gopalarathnam, A., and Hall, C. E., Jr., “Analysis of Different Stabilizing Control Systems for Aircraft with Automated Cruise Flaps,” AIAA Paper 2006-6134, Proc. of the AIAA Atmospheric Flight Mechanics Conference, Keystone, CO, 21–24 August, 2006. | |
| 25. | Cusher, A. and Gopalarathnam, A., “Drag Reduction Methodology for Adaptive Tailless Aircraft,” AIAA Paper 2006-3320, Proc. of the 24th AIAA Applied Aerodynamics Conference, San Francisco, CA, 5–8 June, 2006. | Revised and published as journal paper # 18 |
| 24. | Shipley, E., Jr., and Gopalarathnam, A., “Static Aeroelasticity Considerations in Aerodynamic Adaptation of Wings for Low Drag,” AIAA Paper 2006-0451, 44th AIAA Aerospace Sciences Meeting, Reno, NV, 9–12 January, 2006. | |
| 23. | Jepson, J. and Gopalarathnam, A., “Computational Study of Automated Adaptation of a Wing with Multiple Trailing-Edge Flaps,” AIAA Paper 2005-1035, 43rd AIAA Aerospace Sciences Meeting, Reno, NV, 10–13 January, 2005. | |
| 22. | Vosburg V. and Gopalarathnam, A., “The Stability and Control of an Aircraft with an Adaptive Wing,” AIAA Paper 2004-4814, Proc. of the AIAA Atmospheric Flight Mechanics Conference, Providence, RI, 16–19 August, 2004. | |
| 21. | King, R. and Gopalarathnam, A., “Ideal Lift Distributions and Flap Angles for Adaptive Wings,” AIAA Paper 2004-4722, Proc. of the 22nd AIAA Applied Aerodynamics Conference, Providence, RI, 16–19 August, 2004. | Revised and published as journal paper # 14 |
| 20. | McGowan, G. Z., Gopalarathnam, A., and Jones, G. S., “Analytical and Computational Study of Adaptive Circulation Control Airfoils,” AIAA Paper 2004-4721, Proc. of the 22nd AIAA Applied Aerodynamics Conference, Providence, RI, 16–19 August, 2004. | |
| 19. | McGowan, G. Z. and Gopalarathnam, A., “CFD Analysis of a Circulation Control Airfoil using Fluent” in Proc. of the 2004 Navy/NASA Langley Circulation Control Workshop, Hampton, VA, March 2004. | |
| 18. | King, R. and Gopalarathnam, A., “Ideal Aerodynamics of Formation-Flying and Ground-Effect Flight,” AIAA 2004-0906, presented at the 42nd AIAA Aerospace Sciences Meeting, Reno, NV, 5–8 January, 2004. | Revised and published as journal paper # 10 |
| 17. | Mukherjee, R. and Gopalarathnam, A., “Post-Stall Prediction of Multiple-Lifting-Surface Configurations Using a Decambering Approach,” AIAA 2004-0219, presented at the 42nd AIAA Aerospace Sciences Meeting, Reno, NV, 5–8 January, 2004. | Revised and published as journal paper # 12 |
| 16. | Jepson, J. and Gopalarathnam, A., “Inverse Design of Adaptive Airfoils with Aircraft Performance Considerations,” AIAA 2004-0028, presented at the 42nd AIAA Aerospace Sciences Meeting, Reno, NV, 5–8 January, 2004. | Revised and published as journal paper # 11 |
| 15. | Jepson, J. K. and Gopalarathnam, A., “Incorporation of Aircraft Performance Considerations in Inverse Airfoil Design,” AIAA Paper 2003-3499, presented at the 21st Applied Aerodynamics Conference, Orlando, FL, 23–26 June 2003. | Revised and published as journal paper # 9 |
| 14. | Mukherjee, R., Gopalarathnam, A., and Kim, S., “An Iterative Decambering Approach For Post-Stall Prediction of Wing Characteristics Using Known Section Data,” AIAA Paper 2003-1097, presented at the 41st Aerospace Sciences Meeting, Reno, NV, 6–9 January 2003. | Revised and published as journal paper # 12 |
| 13. | Jepson, J. K. and Gopalarathnam, A., “Inverse Airfoil Design via Specification of the Boundary-Layer Transition Curve,” AIAA Paper 2003-0212, presented at the 41st Aerospace Sciences Meeting, Reno, NV, 6–9 January 2003. | |
| 12. | McKay, N. J. and Gopalarathnam, A., “The Effects of Wing Aerodynamics on Race Vehicle Performance,” SAE Paper 2002-01-3294, Proceedings of the SAE Motorsports Engineering Conference, Indianapolis, IN, 2–5 December 2002. | Published as journal paper # 6 |
| 11. | McAvoy, C. W. and Gopalarathnam, A., “Automated Trailing-Edge Flaps for Airfoil Drag Reduction over a Large Lift Coefficient Range,” AIAA Paper 2002-2927, presented at the 20th Applied Aerodynamics Conference, St. Louis, MO, 24–26 June 2002. | pdf, also seeJournal article # 5 |
| 10. | Gopalarathnam, A., Broughton, B., McGranahan, B. D., and Selig, M. S., “Design of Low Reynolds Number Airfoils with Trips,” AIAA Paper 2001-2463, presented at the 19th AIAA Applied Aerodynamics Conference, Anaheim, CA, 11–14 June 2001. | Revised and published as journal paper # 7 |
| 9. | Gopalarathnam, A. and McAvoy, C. W., “Effect of Airfoil Characteristics and Trim Considerations on Aircraft Performance,” AIAA Paper 2001-2409, presented at the 19th AIAA Applied Aerodynamics Conference, Anaheim, CA, 11–14 June 2001. | Revised and published as journal paper # 3 |
| 8. | Selig, M. S., Gopalarathnam, A., Giguere, P., and Lyon, C. A., “Systematic Airfoil Design Studies at Low Reynolds Numbers,” presented at the conference on “Fixed, Flapping and Rotary Wing Vehicles At Very Low Reynolds Numbers,” University of Notre Dame, Notre Dame, IN, 5–7 June, 2000. | |
| 7. | Gopalarathnam, A. and Selig, M. S., “A Hybrid Approach to Inverse Design of Complex Aerodynamic Systems,” AIAA Paper 2000-0784, presented at the 38th AIAA Aerospace Sciences Meeting, Reno, NV, 10–13 January 2000. | |
| 6. | Gopalarathnam, A. and Selig, M. S., “A Hybrid Method for Multipoint Inverse Wing Design,” AIAA Paper 99-0401, presented at the 37th AIAA Aerospace Sciences Meeting, Reno, NV, 11–14 January 1999. | Revised and published as journal paper # 4 |
| 5. | Gopalarathnam, A. and Selig, M. S, “Low Speed NLF Airfoils: A Case Study in Inverse Airfoil Design,” AIAA Paper 99-0399, presented at the 37th AIAA Aerospace Sciences Meeting, Reno, NV, 11–14 January 1999. | Revised and published as journal paper # 2 |
| 4. | Gopalarathnam, A. and Selig, M. S., “A Multipoint Viscous Design Method for Multi-Element Airfoils,” AIAA Paper 98-2404, Proceedings of the 16th AIAA Applied Aerodynamics Conference, Albuquerque, NM, 15–18 June 1998. | |
| 3. | Gopalarathnam, A., Selig, M. S. and Hsu, F., “Design of High-Lift Airfoils for Low Aspect Ratio Wings with Endplates,” AIAA Paper 97-2232, Proceedings of the 15th AIAA Applied Aerodynamics Conference, Atlanta, GA, 23–25 June 1997. | |
| 2. | Gopalarathnam, A. and Selig, M. S., “A Multipoint Inverse Method for Multi-Element Airfoil Design,” AIAA Paper 96-2396, Proceedings of the 14th AIAA Applied Aerodynamics Conference, New Orleans, LA, 17–20 June 1996. | Revised and published as journal paper # 1 |
| 1. | Tulapurkara, E. G., Gopalarathnam, A. and Karthik, K., “Recent Developments in Flight Testing of light airplanes,” presented at the National Seminar on Flight Testing, Aircraft and Systems Testing Establishment, Bangalore, India, 26–27 April 1991. |