Georgia Institute of Technology

School of Aerospace Engineering

Center of Excellence for Rotorcraft Technology (CERT)

CFD Studies

Progress Reports:

Task 9.1.1, First Principles Based Prediction of Rotorcraft Aeroacoustics, Year 1, September 1, 1996-December 31, 1996
Task 9.1.1, First Principles Based Prediction of Rotorcraft Aeroacoustics, Year 2, January 1, 1997-December 31, 1997
Task 9.1.2, Near wake Studies of Low Noise Rotors, CFD Simulations, Year 1, September 1, 1996 - December 31, 1996
Task 9.1.2, Near wake Studies of Low Noise Rotors, Year 2, January 1, 1997 - December 31, 1997
Task 9.4.2, Efficient Solution procedures for Aeroelastic Analysis of Rotorcraft, CFD Simulations, Year 2, January 1, 1997-December 31, 1997.

Recent Publications:

Douglas V. Nance and L. N. Sankar, "Low Dispersion Finite Volume Schemes in the Resolution of Vortex Shedding Noise," AIAA paper 98-0366.

Douglas V. Nance, L. N. sankar and K. Viswanathan, "An Improved Family of Low Dispersion Finite Volume Schemes for Aeroacoustic Applications," Proceedings of the Second Asian CFD Conference, December 1996. Text, Figures.

Sankar, L. N., Berkman, M., Russell, J. and Hariharan, N., "A First principles based Method for the Prediction of Loading over Fixed and Rotary Wing Geometries," Invited paper, Proceedings of the Japanese CFD Conference, December 19, 1996.

Russell, Justin, W., Sankar, L. N., Tung, C. and Patterson, M. T., "Alterations of the Tip Vortex Structure from a Hovering Rotor using Passive Tip devices," Proceedings of the 1997 AHS Forum.

Russell, Justin, W., "Modifications of  the Tip Vortex Structure from a Hovering Rotor Using Spoilers", Invited Paper, IUTAM Symposium on Dynamics of Slender Vortices, Aachen, Germany, August 31-September 3, 1997.

Berkman, M.E. , Sankar, L. N., Berezin, C. R., and Torok, M. S., "A Navier-Stokes/Ful Potential/Free Wake Method forAdvancing Multi-bladed Rotors , Proceedings of the 1997 AHS Forum.

Wang, G., Sankar, L. N. and Tadghighi, H., "Prediction of Rotorcraft Noise with a Low Dispersion Finite Volume Scheme,"  AIAA-99-0480-Text

Wang, G., Sankar, L. N. and Tadghighi, H., "Prediction of Rotorcraft Noise with a Low Dispersion Finite Volume Scheme, AIAA-99-0480-Figures

Usta, E., Wang, G. and Sankar L. N., "Application of A Symmetric Total Variation Diminishing Scheme to Shock Noise of Rotors," AIAA 2000-0348, 38th AIAA Aerospace Sciences Meeting, Reno, NV 2000 (word format)

Sahin, M.., Sankar L. N., Chandrasekhara, M. S., Tung, C. "Stall Alleviation Using a Deformable Leading Edge Concept," AIAA 2000-0520, 38th AIAA Aerospace Sciences Meeting, Reno, NV 2000 (word format)

Yang, Z., Sankar L. N., Smith, M., Bauchau, O., "Recent Improvements to a Hybrid Method for Rotors in Forward Flight," AIAA 2000-0260, 38th AIAA Aerospace Sciences Meeting, Reno, NV 2000 (PDF format)

Liu, Z., Sankar L. N., Hassan A. A.,"Alteration of the Tip Vortex Structure of a Hovering Rotor Using Oscillatory Jet Excitation," AIAA 2000-0259, 38th AIAA Aerospace Sciences Meeting, Reno, NV 2000 (word format)

Nathan, Hariharan and Sankar, L., "A Review of Computational techniques for Rotor Wake Modeling," AIAA paper 2000-0014, 38th AIAA Aerospace Sciences Meeting, Reno, NV, (Word Format)

Usta,E.,"Application of a Symmetric Total Variation Diminishing Scheme To Aerodynamics and Aeroacaoustics of Rotors," Ph.D. Proposal Presentation(ppt file)

Yang, Zhong, "A HYBRID FLOW ANALYSIS FOR ROTORS IN FORWARD FLIGHT", Ph.D. Thesis (page links to PDFs)

Wang,G.,"Prediction of Rotorcraft Noise with A Low-Dispersion Finite Volume Scheme," Ph.D. Proposal Presentation(ppt file)

Usta, E., Sankar, L.N."Application of High Order Schemes to Aerodynamics of Hovering Rotors," American Helicopter Society Aerodynamics, Acoustics, and Test and Evaluation Technical Specialists Meeting San Francisco, January 23-25, 2002(Word format)

Usta, E., Wake, B.E., Egolf, A.T. and Sankar, L.N."Application of a Symmetric Total Variation Diminishing Scheme To Aerodynamics and Aeroacoustics of Rotors,"American Helicopter Society 57th Annual Forum,Washington D.C., May 9-11,2001(pdf format)

Hariharan, N., Ekaterinaris, J., Gupta, R., Liu, Y., and Sankar, L. N., "An Evaluation of High Order Spatial Accuracy Algorithms for Modeling Fixed and Rotary Wing Tip regions," Proceedings of the American Helicopter Society Aerodynamics, Acoustics, and Test and Evaluation Technical Specialists Meeting San Francisco, January 23-25, 2002

Usta,E.,"Application of a Symmetric Total Variation Diminishing Scheme To Aerodynamics of Rotors," Ph.D. Dissertation(pdf file)

Usta,E.,"Application of a Symmetric Total Variation Diminishing Scheme To Aerodynamics of Rotors," Ph.D. Defense Presentation(ppt file)

Animations:

Stall Alleviation Using a Deformable Leading Edge Concept:
Vorticity contours around a pitching NACA0012 airfoil
Vorticity contours around a pitching DLE airfoil