Anastasios Lyrintzis

Anastasios S. Lyrintzis

1994 - Adjunct Professor

Degrees

Diploma, National Technical University, Athens Greece, Mechanical Engineering, 1981
M.S., Cornell University, Aerospace Engineering, 1985
Ph.D., Cornell University, Aerospace Engineering, 1988

Contact

701 W. Stadium Ave.
West Lafayette, IN 47907-2045

Office: ARMS 3321
Office Phone: +1 765 49-45142
Email: lyrintzi@purdue.edu
Webpage: http://cobweb.ecn.purdue.edu/~lyrintzi

Interests

Computational Aeroacoustics
Aerodynamics for rotorcraft and jet flows

Awards and Major Appointments

CT Sun Research Award, School of Aeronautics and Astronautics, Purdue University, 2010

Purdue University Faculty Scholar, Fall 2004.

American Helicopter Society, Howard Hughes Award (given in recognition of outstanding improvement in fundamental helicopter technology), NASA Tiltrotor Aeroacoustics Code (TRAC) system development team (A. Lyrintzis was a member of the team), June 2002.

NASA Group Achievement Award Tiltrotor Aeroacoustics Code (TRAC) system development team (A. Lyrintzis was a member of the team), July 2002.

American Helicopter Society, Best paper in Acoustics Sessions of 51st Annual Forum (1995).

ASME Fellow (March 2003)

AIAA Associate Fellow (Sept. 1996)

Technical Committees
AIAA Aeroacoustics Committee (1994-97, 2001-present); Awards Subcommitteee (1994-1997, Chairman 1996-97), Aeroacoustics Conference Subcommittee (2001-present)
AHS Acoustics Committee (1993-96)
ASME Coordinating Group on Computational Fluid Dynamics (1991-present)

Research Areas

Dr. Lyrintzis' research can be divided mainly into two areas:
  1. The Use of Integral Techniques in Computational Aeroacoustics:

    Dr. Lyrintzis has made significant contributions in the use of integral techniques Computational Aeroacoustics (CAA). CAA is concerned with the prediction of the aerodynamic sound source and the transmission of the generated sound starting from the time-dependent governing equations. The goal is to improve the state-of-the-art predictive techniques, so that aircraft and rotorcraft noise can be reduced. Dr. Lyrintzis has pioneered the use of integral techniques, (i.e. the Kirchhoff method and the porous Ffowcs Williams Hawkings [FWH] equation) for describing noise propagation. The methods are attractive because they utilize surface integrals (over a source region) to determine far-field acoustics, as opposed to the memory intensive volume integrals found in traditional acoustic analogy methods.

    Rotorcraft Impulsive Noise: In recent years the increasing use of helicopters and the projected use of tiltrotor aircraft has drawn attention to the noise that they generate. Among the several types of helicopter and tilt rotor noise, that due to helicopter impulsive noise is the most important. Dr. Lyrintzis has introduced the application of Kirchhoff's methodology for rotorcraft impulsive noise prediction. The details of the noise mechanisms are studied extensively and analogies to other unsteady motions are drawn. Both full potential as well as Euler/Navier Stokes codes are employed for the aerodynamic near-field prediction. Dr. Lyrintzis also investigates ideas for noise reduction (e.g. blade tip shape).

    Jet Noise: Jet noise prediction is a very important part of aircraft noise. Dr. Lyrintzis has employed Kirchhoff's method in jet noise prediction, as well. He introduced an important extension to the method in order to include non-linear flow regions that exist downstream of the Computational Fluid Dynamics (CFD) domain. Dr. Lyrintzis proved the equivalence of Acoustic Analogy methods (based on the Ffowcs Williams Hawkings [FWH] equation) and Kirchhoff's methods, as part of the extensions of the Kirchhoff method. He also added mean flow refraction corrections (downstream of the control surface) in the methodology. A new high-order accurate three-dimensional Large Eddy Simulation (LES) CFD code has been developed (with Professor Blaisdell) to provide accurate input data for the Kirchhoff and FWH equation methods. This was part of a large-scale effort in jet noise reduction in collaboration with Rolls-Royce, Indianapolis.

    Dr. Lyrintzis' research demonstrates that a simple set of versatile portable Kirchhoff/Acoustic Analogy subroutines can be developed to analyze and reduce noise generation in a number of applications including fans, propellers, air-conditioning units etc. This work has been funded by NASA Langley Research Center, NASA Glenn Research Center, Sikorsky Aircraft Company and the Indiana 21st Research and Technology Fund, and the Aeroacoustics Research Consortium.

  1. Efficient Parallel Methods for Transonic Flow Calculations.

    Dr. Lyrintizis is also investigating the development of efficient computational techniques for the calculation of unsteady transonic flow on parallel machines. The goal is to improve efficiency and parallelization of legacy CFD codes. Dr. Lyrintzis studies unsteady three-dimensional problems in rotorcraft aerodynamics to enhance the computational efficiency of impulsive rotorcraft noise calculations. THe algorithm methodologies developed are general and can be readily applied to several existing CFD codes. This work has been funded by NASA Ames Research Center.

Publications

Kube-MacDowell, M*., Lyrintzis, A. S., and Blaisdell, G. “A Parametric Study of the Generation of Shocks in Near-Critical Turbofan Nozzles”, AIAA Journal of Propulsion and Power, Vol. 26, No. 6, Nov.-Dec. 2010, pp.1259 – 1268

Lew P-T, Lyrintzis, A. S., and Mongeau L., “Noise Prediction of a Subsonic Turbulent Round Jet Using the Lattice-Boltzmann Method,” Journal of the Acoustical Society of America, Vol. 128, No. 3, Sept. 2010, pp. 1118 – 1127

Lo, S-C, Blaisdell, G. A., and Lyrintzis A. S. “High-Order Shock Capturing Schemes for Turbulence Calculations,” International Journal of Numerical Methods in Fluids, February 2010, pp. 473 – 498

Lo, S-C, Blaisdell, G. A., and Lyrintzis A. S. “High-Order Shock Capturing Schemes for Turbulence Calculations,” International Journal of Numerical Methods in Fluids International Journal of Numerical Methods in Fluids, February 2010, pp. 473—498.

Pan F., Uzun, A., and Lyrintzis, A., "Surface Integral Methods in Jet Aeroacoustics: Refraction Corrections," AIAA Journal of Aircraft, Vol. 45, No. 2, March-April 2008, pp. 381-387.

Namgoong, H., Crossley, W., and Lyrintzis, A. S., "Global Optimization Issues for Transonic Airfoil Design," AIAA Journal, Vol. 49, No. 9, Sept. 2007, pp. 2113-2124.

Uzun A., Blaisdell G. A., and Lyrintzis, A. S., "Impact of Subgrid-Scale Models on Jet Turbulence and Noise," AIAA Journal, Vol. 44, No. 6, June 2006, pp. 1365-1368.

Wright, C., Blaisdell G. A., and Lyrintzis, A. S., "Investigating Correlations Between Reynolds Averaged Flow Fields and Noise for Forced Mixed Jets," AIAA Journal of Aircraft, Vol. 43, No. 4, Jul.-Aug. 2006, pp. 886-894.

Garrison L., Dalton, W., Lyrintzis A., and Blaisdell, G, "Semi-Empirical Noise Models for Predicting the Noise from Jets with Internal Forced Mixers," International Journal of Aeroacoustics, Vol. 5, No. 2, April 2006, pp. 139-171 (33 pages).

Zhang, X., Blaisdell, G. A., and Lyrintzis, A., S., "High-Order Compact Schemes with Filters on Multi-Block Domains," Journal of Scientific Computing, Vol. 21 No. 3, Dec. 2004, pp. 321-339.

Uzun, A., Blaisdell, G. A., and Lyrintzis, A. S., "Application of Compact Schemes to LES of Turbulent Jets," Journal of Scientific Computing, Vol. 21 No. 3, Dec. 2004, pp. 283-319.

Uzun, A., Blaisdell, G. A., and Lyrintzis, A. S. "Coupling of Integral Acoustics Methods with LES for Jet Noise Prediction," International Journal of Aeroacoustics, October 2004, vol. 3, no. 4, pp. 297-346(50).

Conference Proceedings, Presentations, Invited Lectures

Situ Y., Liu L., Martha C., Louis M., Li Z., Sameh, A., Blaisdell G., and Lyrintzis, A. “Reducing Communication Overhead in Large Eddy Simulation of Jet Engine Noise.” presented at the IEEE International Conference on Cluster Computer, Heraklion Crete, Greece, Sept. 2010

Thirumurthy, D. Jones, J., Blaisdell, G., Lyrintzis, A., and Sullivan, J., “Experimental Investigation and Computation of a Supersonic Ejector Nozzle with Clamshells,” AIAA paper 2010-4725 presented at the 40th Fluid Dynamics Conference, Chicago, IL, June-July 2010

Gross, N., Blaisdell G., Lyrintzis, A., “Evaluation of Turbulence Model Corrections for Supersonic Jets using the OVERFLOW Code,” AIAA paper 2010-4604 presented at the 40th AIAA Fluid Dynamics Conference, Chicago, IL, June-July 2010

Lo, S-C, Blaisdell, G. A., and Lyrintzis A. S. "High-Order Shock Capturing Schemes for Turbulence Calculations," AIAA paper 2008-2970 presented at the 14th AIAA/CEAS Aeroacoustics Conference, Vancouver Canada, May 2008.

Kube-McDowell, M. T., Lyrintzis, A. S., and Blaisdell, G. A., "Parametric Study of the Generation of Shocks in Near-Critical Turbofan Nozzles," AIAA paper 2008-2984 presented at the 14th AIAA/CEAS Aeroacoustics Conference, Vancouver Canada, May 2008.

Oliver, A. B., Lillard, R. P., and Lyrintzis, A. S., "Effects of Three-Dimensionality in Turbulent Compression Ramp Shock-Boundary Layer Interactions," AIAA paper 2008-0720, presented at the 45th Aerospace Science Meeting, Reno, NV, Jan. 2008.

Lew, P-T., Lyrintzis, A. S., Crouse B., Balasubramanian, G., Freed, D., and Mongeau L., "Noise Prediction of a Subsonic Turbulent Round Jet Using the Lattice-Boltzmann Method," AIAA paper 2007-3636, presented at the 13th AIAA/CEAS Aeroacoustics Conference, Rome Italy, May 2007.

Lo, S-C, Blaisdell, G. A., and Lyrintzis A. S. "High-Order Shock Capturing Schemes for Turbulence Calculations," AIAA paper 2007-0827, presented at the 45th Aerospace Science Meeting, Reno, NV, Jan. 2007.

Oliver, A. B., Lillard, R. P., Schwig, A., Blaisdell G. A., and Lyrintzis, A. S., "Assessment of Turbulent Shock-Boundary Layer Interaction Computations Using the OVERFLOW Code," AIAA paper 2007-0104, presented at the 45th Aerospace Science Meeting, Reno, NV, Jan. 2007.

Lew, P., Blaisdell G. A., and Lyrintzis, A. S., "Investigation of Noise Sources in Turbulent Hot Jets Using Large Eddy Simulation Data," AIAA paper 2007-0016 presented at the 45th Aerospace Science Meeting, Reno, NV, Jan. 2007.

Garrison L., Lyrintzis A., and Blaisdell, G., "RANS-Based Noise Predictions of Jets with Internal Flow Mixers," AIAA paper 2006-2599, presented at the 12th AIAA/CEAS Aeroacoustics Conference, Cambridge, MA, May 2006.

Namgoong, H, Crossley, W., and Lyrintzis, A. S., Using Aerodynamic Pressure to Reduce Actuation Energy for a Morphing Airfoil," AIAA paper 2006-2041, presented at the 2nd Multidisciplinary Design and Optimization Specialists’ Meeting, Newport, RI, May 2006.

Namgoong, H, Crossley, W., and Lyrintzis, A. S., "Aerodynamic Optimization of a Morphing Aircraft Using Energy as an Objective," AIAA paper No. 2006-1234, presented at the 44th Aerospace Science Meeting, Reno, NV, Jan. 2006.

Oliver, A. B., Lillard, R. P., Blaisdell G. A., and Lyrintzis, A. S., "Validation of High-Speed Turbulent Boundary Layer and Shock Boundary Layer Interaction Computations with the OVERFLOW code," AIAA paper No. 2006-0894, presented at the 44th Aerospace Science Meeting, Reno, NV, Jan. 2006.

Lew, P., Blaisdell G. A., and Lyrintzis, A. S., "Development of a Parallel 3D LES Methodology for Jet Aeroacoustics via the Schur Complement," AIAA paper No. 2006-0796, presented at the 44th Aerospace Science Meeting, Reno, NV, Jan. 2006.

Lew, P., Blaisdell G. A., and Lyrintzis, A. S., "Recent Progress on Hot Jet Aeroacoustics Using 3-D Large Eddy Simulation," AIAA paper 2005-3084 presented at the 11th AIAA/CEAS Aeroacoustics Conference, Monterey, CA, May 2005.

Garrison L., Lyrintzis A., Blaisdell, G, and Dalton, W., "Computational Fluid Dynamics Analysis of Flows with Internal Forced Mixers," AIAA paper 2005-2887 presented at the 11th AIAA/CEAS Aeroacoustics Conference, Monterey, CA, May 2005.

Garrison L., Dalton, W., Lyrintzis A., and Blaisdell, G, "On the Development of Semi-Empirical Noise Models for Predicting the Noise from Jets with Internal Forced Mixers," AIAA paper 2004-2898 presented at the 10th AIAA/CEAS Aeroacoustics Conference, Manchester, United Kingdom, May 2004.

Pan F., Uzun, A., and Lyrintzis, A., "Refraction Corrections for Surface Integral Methods in Jet Aeroacoustics," AIAA paper 2004-2873, presented at the 10th AIAA/CEAS Aeroacoustics Conference, Manchester, United Kingdom, May 2004.

Wright, C., Blaisdell G. A., and Lyrintzis, A. S., "Using RANS to Predict the Performance of Mixers in Reducing Jet Noise," AIAA paper No. 2004-1274, presented at the 42nd Aerospace Science Meeting, Reno, NV, Jan. 2004.

Uzun, A., Lyrintzis, A. S., and Blaisdell, G. A., "Coupling Integral Acoustics Methods with LES for Jet Noise Prediction," AIAA paper No. 2004-0517, presented at the 42nd Aerospace Science Meeting, Reno, NV, Jan. 2004.

Lew, P., Uzun, A., Blaisdell G. A., and Lyrintzis, A. S., "Effects of Inflow Forcing on Jet Noise Using Large Eddy Simulation," AIAA paper No. 2004-0516, presented at the 42nd Aerospace Science Meeting, Reno, NV, Jan. 2004.


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