Prof. Dr. Yusuf Özyörük

Education

• Ph.D., 1995, Pennsylvania State University, Aerospace Eng.
• M.Sc., 1992, Pennsylvania State University, Aerospace Eng.
• B.Sc., 1988, Istanbul Technical University, Aeronautical Eng.

Courses Taught

• Introduction to Aircraft Performance
• Fluid Mechanics
• Aerodynamics I
• Aerodynamics II
• Numerical Methods
• Heat Transfer
• Propulsion I
• Fundamentals of Aerodynamic Noise

Research interests

• Aeroacoustics, computational aeroacoustics
• Thermoacoustics - combustion instability, internal balistics
• Computational fluid dynamics, fixed/rotary wing aircraft aerodynamics

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Samples from research projects

• Aeroacoustic code development for rotorcraft noise (TAI, Inc.)
• Wind turbine aerodynamics and aeroacoustics (TUBITAK)
• Computational studies of aerodynamic integrity of external systems (ASELSAN, Inc.)
• Common Nozzle Assembly Liner Study, (w/ AeroTim) ( Rolls-Royce-USA / ISVR-UK).
• TURNEX - Turbomachinery Noise Radiating through the Engine Exhaust (EC FP6 STREP).



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Publications

• M.O. Öztürkmen, Y. Özyörük, "Investigation of a Solution Approach to Quadratic Eigenvalue Problem for Thermoacoustic Instabilities," AIAA SciTech Forum, Jan 2022, San Diego, USA, DOI: 10.2514/6.2022-1855.
• Ö. Yalçın, Y. Özyörük, "Delayed Detached-Eddy Simulation of Transonic Cavity Noise," AIAA Aviation Forum, 2021, August 2021, DOI: 10.2514/6.2021-2165.
• Ö. Yalçın, K. Cengiz, L. Wein, Y. Özyörük, J.R. Seume, "Transitional DDES Study over a Circular Cylinder and an Airfoil," 13th International ERCOFTAC Symposium, Sep. 2021, Rhodes.
• Ç. O. Alanyalıoglu, Y. Özyörük, "Conjugate Analysis of Silica-Phenolic Charring Ablation Coupled with Interior Balistics," Journal of Propulsion and Power, DOI: 10.2514/1.B37839 (2021)
• K. Cengiz, Y. Özyörük, "Experiences with two detached eddy simulation approaches through use of a high-order finite volume solver," International Journal of Numerical Methods in Fluids, vol. 92, (2020)
• O. Baran, B. Sümer, Y. Özyörük, "Experimental and numerical investigation of coaxial pressure swirl injectors," AIAA Scitech Forum, 2019, California, USA, 7-11 January 2019.
• M. O. Öztürkmen, Y. Özyörük, "Investigation of Air Core Characteristics of a Pressure Swirl Injector Using Two Different Volume of Fluid Methods," ECCOMAS MSF 2019 4th International Conference on Multi-Scale Computational Methods for Solids and Fluids, Bosnia-Herzegovina, 18-20 September 2019.
• Y. Özyörük, M. O. Öztürkmen, "Prediction of Rocket Jet Noise by Empirical and Numerical Approaches," 10th Ankara International Aerospace Conference, 18-20 Sep. 2019.
• S. Coşkun, Y. Özyörük, "Flow and Noise Prediction of Doors-on M219 Cavity through Improved Delayed Detached Eddy Simulations," 31st International Conference on Parallel Computational Fluid Dynamics, 14-17 May 2019.
• A.C. Özer, B. Sümer, Y. Özyörük, "Examination of flow field inside grain port and grain regression characteristics of a nozzleless solid propellant rocket motor," AIAA Propulsion and Energy Forum and Exposition, 2019, Indiana, USA, 19-22 August 2019.
• Y. Özyörük, G. Demirel, "Acoustic characterization of a rocket combustion chamber," 10th Ankara International Aerospace Conference, 18-20 Sep. 2019.
• M.M. Atalay, M. Şenipek, A. Yücekayalı, Y. Özyörük, "Main Rotor-Tail Rotor Interactional Noise," 8th Asian/Australian Rotorcraft Forum, 30 Oct.-2 Nov. 2019.
• S. Coşkun, Y. Özyörük, "Unsteady Reynolds-Averaged Navier-Stokes and Detached Eddy Simulations of Transonic Cavity Flows," 10th Ankara International Aerospace Conference, 18-20 Sep. 2019.
• Ö. Yalçın, Ö. Yırtıcı, Y. Özyörük, İ.H. Tuncer, "Aerodynamic Performance Analyses of Iced Wind Turbine Blade Profile with Transitional DDES," 10th Ankara International Aerospace Conference, 18-20 Sep. 2019.
• Ç. O. Alanyalıoğlu, Y. Özyörük, "Fully transient conjugate analysis of silica-phenolic charing ablation coupled with interior ballistics," AIAA Propulsion and Energy Forum and Exposition, 2019, Indiana, USA, 19 - 22 August 2019.
• M. Şenipek, A. Yücekayalı, Y. Ortakaya, Y. Özyörük, "Main Rotor-Tail Rotor Interactional Noise," 8th Asian/Australian Rotorcraft Forum, 30 Oct.-2 Nov. 2019.
• Ö. Yalçın, K. Cengiz, Y. Özyörük, "High-order detached eddy simulation of unsteady flow around NREL S826 airfoil," Journal of Wind Engineering and Industrial Aerodynamics, vol. 179 (2018)
• Ö. Yalçın, K. Cengiz, Y. Özyörük, "Delayed Detached-Eddy Simulation around NREL S826 Blade Section for Transition Prediction," 14th EAWE PhD Seminar, BRÜKSEL, Belgium, 18 - 20 September 2018.
• Ö. Yalçın, K. Cengiz, Y. Özyörük, "Noise prediction of a transonic cavity flow via shear-layer-adapted delayed detached-eddy simulation," AIAA/CEAS Aeroacoustics Conference, 2018, Georgia, USA, 25 - 29 June 2018.
• A. Yücekayalı, M. Şenipek, Y. Ortakaya, Y. Özyörük, "TACO: Helicopter noise predictions," 7th Asian/Australian Rotorcraft Forum, ARF 2018, Seogwipo City, Jeju Island, South Korea, 30 October - 01 November 2018.
• Ö. Yalçın, K. Cengiz, Y. Özyörük, "Shear-layer-adapted delayed detached-eddy simulation of a transonic open cavity flow," 9th Ankara International Aerospace Conference, Ankara, Turkey, 20 - 22 September 2017.
• B. Gümüş, Y. Özyörük, "Vehicle wind noise prediction through solutions of Navier-Stokes and Ffowcs Williams Hawkings equations," 9th Ankara International Aerospace Conference, Ankara, Turkey, 20-22 September 2017.
• A.O. Yüksel, Y. Özyörük, "CFD analysis of helicopter rotors in forward flight," 9th Ankara International Aerospace Conference, Ankara, Turkey, 20-22 September 2017.
• Ö. Yalçın, K. Cengiz, Y. Özyörük, "High-order detached eddy simulation of unsteady flow around NREL S826 airfoil," WINERCOST’xx17-The International Conference on Wind Harvesting 2017, 20-21 April 2017.
• Y. Özyörük, A. Ünal, A.O. Yüksel, "Noise predictions of helicopter rotors in hover and forward flight," 23rd AIAA/CEAS Aeroacoustics Conference, 2017, Colorado, USA, 5-9 June 2017.
• A.C. Özer, Y. Özyörük, "Application of the universal expression for erosive burning to Nozzleless solid propellant Rocket motors," 53rd AIAA/SAE/ASEE Joint Propulsion Conference, 2017, Atlanta, Georgia, 10-12 July 2017.
• E. Arslan, Y. Özyörük, M. Çalışkan, "Numerical Analysis of One-Dimensional Sound Propagation Through a Duct Containing Water Droplets," Journal of Computational Acoustics, DOI: 10.1142/S0218396X1650017X vol. 24 (July 2016).
• B. Tester, Y. Özyörük, D. Sutliff, R. Bozak, "Validation of an in-duct to far-field beamformer method for predicting far-field fan broadband noise," AIAA Paper 2016=2894, 22nd AIAA/CEAS Aeroacoustics Conference, Lyon, France, (May 2016).
• E. Arslan, M. Çalışkan, Y. Özyörük, "Numerical study of mean flow effect on sound propagation through an aerosol," 172nd Meeting of the Acoustical Society of America, Hawaii, USA, 28 November - 02 December 2016, vol.29
• E. Arslan, Y. Özyörük, M. Çalıskan, "Implementation of finite difference method in frequency domain for solving 1-D sound propagation problem in air containing water droplets," 12th International Conference on Theoretical and Computational Acoustics, Hangzhou, China (2015).
• B. Tester, Y. Özyörük, D. Sutliff, R. Bozak, "Predicting far-field broadband noise levels from in-duct phased array measurements," International Congress on Sound and Vibration, ICSV22, Florence, Italy (July 2015).
• Y. Özyörük, J. Coupland, B. Tester, "Numerical investigation of spinning mode transmission through variable area annular ducts with flow," International Congress on Sound and Vibration, ICSV22, Florence, Italy (July 2015).
• B. Narin, Y. Özyörük, A. Ulaş, "Two Dimensional Numerical Prediction of Deflagration-to-Detonation Transition in Porous Energetic Materials," Journal of Hazardous Materials, 273, 44-52 (2014).
• B. Tester, Y. Özyörük, "Predicting far-field broadband noise levels from in-duct phased array measurements," 20th AIAA Aeroacoustics Conference, AIAA 2014-2913, Atlanta, GA, USA (June 2014).
• K. Cengiz and Y. Özyörük, "Development of a Navier-Stokes solver for high-fidelity simulation of wind turbine noise," in 7th Ankara International Aerospace Conference, Paper number 040, Ankara (September 2013).
• K. Cengiz and Y. Özyörük, "Helmholtz-type Numerical Simulation of Thermo- acoustic Instabilities in a 3-D Rijke Tube," in 49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, AIAA Paper 2013-4060, San Jose, CA (July 2013).
• Y. Özyörük ve B.J. Tester, "Application of frequency-domain linearised Euler solutions to the prediction of aft fan tones and comparison with experimental measurements on model scale turbofan nozzles," Journal of Sound and Vibration , 330, 2846-3858 (2011).
• Y. Özyörük, B.J.Tester, "Assessment of a frequency-domain linearized Euler solver for turbofan aft radiation predictions with comparison to measurements," Procedia IUTAM , IUTAM Symposium on Computational Aeroacoustics for Aircraft Noise Prediction, Ed. R.J. Astley, G.Gabard, Elsevier, 1 , pp. 153-162 (2010)
• E. Kaplan, B. Yazıcı, M.A. Ak, Y. Özyörük, "Experimental study of a T-burner resonator," International Journal of Energetic Materials and Chemical Propulsion , 8 , 173-182 (2009).
• Y. Özyörük, "Numerical prediction of aft radiation of turbofan tones through exhaust jets," Journal of Sound and Vibration , 325 , 122-144 (2009).
• Y. Özyörük, E. Alpman, V. Ahuja ve L. Long, "Frequency-domain prediction of turbofan noise radiation," Journal of Sound and Vibration , 270 , 933-950 (2004).
• Y. Özyörük ve V. Ahuja, "Numerical simulation of fore and aft sound field of a turbofan," AIAA Journal , 42 , 2028-2034 (2004).
• C. Bahar, N. Alemdaroglu, Y. Özyörük ve E. Temel, "Euler solutions of a medium range cargo aircraft," AIAA Journal of Aircraft , 40 , 393-395 (2003).
• Y. Özyörük, "Parallel computation of forward radiated noise of ducted fans with acoustic treatment," AIAA Journal , 40 , 450-455 (2002).
• Y. Özyörük ve L.N. Long, "Time-domain calculation of sound propagation in lined ducts with sheared flows," AIAA Journal , 38 , 768-773 (2000).
• Y. Özyörük, L.N. Long ve M.G. Jones, "Time-domain numerical simulation of a flow-impedance tube," Journal of Computational Physics , 146 , 29-57 (1998).
• Y. Özyörük ve L.N. Long, "Multigrid acceleration of a high-resolution computational aeroacoustics scheme," AIAA Journal , 35 , 428-433 (1997).
• Y. Özyörük ve L.N. Long, "A time-domain implementation of surface acoustic impedance condition with and without flow," Journal of Computational Acoustics , 5 , 277-296 (1997).
• Y. Özyörük ve L.N. Long, "Computation of sound radiating from engine inlets," AIAA Journal , 34 , 894-901 (1996).
• Y. Özyörük ve L.N. Long, "A new efficient algorithm for computational aeroacoustics on parallel processors," Journal of Computational Physics , 125 , 135-149 (1996).
• Y. Özyörük, B.J.Tester, "Application of frequency-domain linearised Euler solutions to the prediction of aft fan tones and comparison with experimental measurements," 17th AIAA/CEAS Aeroacoustics Conference, Portland, Oregon, USA (2011).
• Z. E. Gürsoy, U. Etiz, Y. Özyörük, "Analysis of helicopter flow fields in forward flight including thermal effects of exhaust gases," Ankara International Aerospace Conference, Ankara, Turkey (2011).
• K. Cengiz, Y. Özyörük, "Development of a linear combustion instability analysis tool for 3-D liquid-propellant engine geometries," Ankara International Aerospace Conference, Ankara, Turkey (2011).
• Y. Özyörük, "Algorithmic Improvements to a Frequency-Domain Linearized Euler Solver for Turbomachinery Noise Radiation," AIAA Paper 2010-3718, 16th AIAA/CEAS Aeroacoustics Conference, Stockholm, Sweeden (2010).
• Y. Özyörük, B.J. Tester, "Effects of mean flow and temperature on acoustic liner performance in dual stream flows," AIAA Paper 2009-3166, 15th AIAA/CEAS Aeroacoustics Conference, AIAA 2009, Miami, Florida, USA (2009).
• B.J. Tester, G. Gabard, Y. Özyörük, "Influence of meanflow gradients on fan exhaust noise predictions," AIAA Paper 2008-2825, 14th AIAA/CEAS Aeroacoustics Conference, Vancouver, Canada (2008).
• Y. Özyörük, S. Lidoine, "Numerical Analysis of Noise Radiation from a Turbofan Exhaust Cowl with an Extended Liner in Flight," AIAA Paper 2008-2880, 14th AIAA/CEAS Aeroacoustics Conference, Vancouver, Canada (2008).
• Y. Özyörük, "A Linearized Euler Solver for Computation of Tonal Noise Radiation from Lined Turbofan Nozzles," 5th European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2008, Venice, Italy (2008).
• B. Narin, Y. Özyörük, A. Ulas, "1-D, Two-Phase Modeling of Deflagration-to-Detonation Transition (DDT) Phenomenon in Porous Energetic Materials," 4th Ankara International Aerospace Conference, Ankara (2007).
• E. Kaplan, B. Yazici, M.A. Ak, Y. Özyörük, "Experimental Study of a T-Burner Resonator," Seventh International Symposium on Special Topics in Chemical Properties, Kyoto, Japan (2007).
• Y. Özyörük, E. Dizemen, "Performance Evaluation of Two Parallel, Direct Sparse Solvers for an Aeroacoustic Propagation Model," Parallel CFD 2007, Antalya, Turkey (2007).
• B. Narin, Y. Özyörük, A. Ulas, "Application of Parallel Processing to Numerical Modeling of Two-Phase Deflagration-to-Detonation (DDT) Phenomenon," Parallel CFD 2007, Antalya, Turkey (2007).
• H. E. Konokman, A. Kayran, Y. Özyörük, "Lagrangian Hydrocode Formulation for Large Deformation Problems and Methods to Prevent Volumetric Locking of Triangular Elements," 4th Ankara International Aerospace Conference", Ankara (2007).
• Y. Özyörük, E. Dizemen, A. Aktürk, S. Kaya, "A Frequency Domain Linearized Euler Solver for Turbomachinery Noise Propagation and Radiation," AIAA Paper 2007-3521, 13th AIAA/CEAS Aeroacoustics Conference, Rome, Italy (2007).
• Y. Özyörük, B. Ulusoy, "Simulations of sound radiation from turbofan exhaust," 3rd Ankara International Aerospace Conference, Ankara (2005).
• B. Narin, Y. Özyörük, A. Ulas, "Development of a one-dimensional solver for two-phase, reactive, deflagration-to-detonation transition phenomenon in porous energetic materials," 3rd Ankara International Aerospace Conference, Ankara (2005).
• Y. Özyörük, V. Ahuja, L.N. Long, "On Numerica Predictions of Fore and Aft Noise Radiation from Turbofans," AIAA Paper 2003-0540, AIAA 42th Aerospace Sciences Meeting and Exhibit, Reno, Nevada, USA (2003).
• Y. Özyörük, E. Alpman, V. Ahuja, L.N. Long, "A Frequency-Domain Numerical Method for Noise Radiation from Ducted Fans," AIAA Paper 2002-2587, 8th AIAA/CEAS Aeroacoustics Conference, Breckenridge, Colorada, USA (2002).
• C. Bahar, N. Alemdaroglu, Y. Özyörük, E. Temel, "Euler Solutions for a Medium Range Cargo Aircraft," AIAA Paper 2002-0402, AIAA 40th Aerospace Sciences Meeting and Exhibit, Reno, Nevada, USA (2002).
• Y. Özyörük, V. Ahuja, L.N. Long, "Time-Domain Simulations of Radiation from Ducted Fans with Liners," AIAA Paper 2001-2171, 7th AIAA/CEAS Aeroacoustics Conference, Maastricht, Netherlands (2001).
• Y. Özyörük, "Parallel Computation of Forward Radiated Noise of Ducted Fans with Acoustic Treatment," 9th Intern. Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines, Lyon, France (2000).
• V. Ahuja, Y. Özyörük, L.N. Long, "Computational Simulations of Fore and Aft Radiation From Ducted Fans," AIAA Paper 2000-1943, 6th AIAA/CEAS Aeroacoustics Conference, Lahaina, Hawaii, USA (2000).
• Y. Özyörük, L.N. Long, "Time-Domain Calculation of Sound Propagation in Lined Ducts with Sheared Flows" 5th AIAA/CEAS Aeroacoustics Conference, AIAA Paper, (1999).
• Y. Özyörük, "A High-order Accurate, Three-dimensional Euler Solver on Distributed Computers," Parallel CFD Workshop, Istanbul, Turkey (1999).
• Y. Özyörük, L.N. Long, "Time-domain calculation of sound propagation in lined ducts with sheared flows," AIAA Paper 1999-1817, 5th AIAA/CEAS Aeroacoustics Conference, Bellevue, Washington, USA (1999).
• J. J. Nucciarone, Y. Özyörük, L.N. Long, "New life in dusty decks: results of porting a CM Fortran based aeroacoustic model to high performance Fortran," Supercomputing'97, Proceedings of the 1997 ACM/IEEE conference on Supercomputing (1997).
• Y. Özyörük, L.N. Long, "Impedance boundary conditions for time-domain computational aeroacoustics methods," AIAA Paper 1997-0021, 35th AIAA Aerospace Sciences Meeting, Reno, Nevada, USA (1997).
• Y. Özyörük, L.N. Long, "Progress in time-domain calculations of ducted fan noise - Multigrid acceleration of a high-resolution CAA scheme," AIAA Paper 1996-1771, 2nd AIAA/CEAS Aeroacoustics Conference, State College, Pennsylvania, USA (1996).
• Y. Özyörük, L.N. Long, "A time-domain implementation of surface acoustic impedance condition with and without flow," AIAA Paper 1996-1663, 2nd AIAA/CEAS Aeroacoustics Conference, State College, Pennsylvania, USA (1996).
• Y. Özyörük, L.N. Long, "A new efficient algorithm for computational aeroacoustics on massively parallel computers," AIAA Paper 95-36501, 12th AIAA Computational Fluid Dynamics Conference, San Diego, California, USA (1995).
• Y. Özyörük, L.N. Long, "Computation of sound radiating from engine inlets," AIAA Paper 1995-063, 1st CEAS/AIAA Aeroacoustics Conference, Munich, Germany (1995).
• Y. Özyörük, L.N. Long, "A Navier-Stokes/Kirchhoff method for noise radiation from ducted fans," AIAA Paper 1994-0462, AIAA 32nd Aerospace Sciences Meeting, Reno, Nevada, USA (1994).
• Ö. Demir, F. Kurtulus, N. Alemdaroglu, Y. Özyörük, V. Özveren, O. Pekel, E. Gürses, "Bell UH-1H Helikopteri'nin Daimi Ak?? Alan? Analizi," Mühendis ve Makina, 48, (2007).
• K. Cengiz, Y. Özyörük, "Dogrusal yanma kararsizligi için sayisal analiz programi gelistirilmesi," UHUK 2010, Eskisehir (2010).
• B. Narin, Y. Özyörük, A. Ulas, "Kati Enerjik Malzemelerin Yanma Patlama Geçisinin iki Fazli, iki Boyutlu Sayisal Benzetimi," II. Ulusal Havacilik ve Uzay Konferansi, UHUK-2008, Istanbul (2008).
• M. Alemdaroglu, Y. Özyörük, S. Karasoy, "Sesüstü bir hava aliginin analitik yöntemlerle tasarimi ve hesaplamali akiskanlar dinamigi analizi," 1. Ulusal Havacilik ve Uzay Konferansi, Ankara (2006).
• B. Ulusoy, E. Dizemen, Y. Özyörük, "Frekans Alaninda Turbofan Motorlarin Egzoz Kismindan Yayilan Sesin Analizi," 1. Ulusal Havacilik ve Uzay Konferansi, Ankara (2006).
• S. Kaya, E.Dizemen, Y. Özyörük, "Tipik Uçak Motoru Egzoz Akisinin k-epsilon Türbülans Modeli ile Çözümüne Sinir Kosullarinin ve Türbülans Yogunlugunun Etkileri," 1. Ulusal Havacilik ve Uzay Konferansi, Ankara (2006).
• H. Erhan, Y. Özyörük, N. Alemdaroglu, "F-16 Savas Uçaginin Aerodinamik Analizi," Kayseri 5inci Havacilik Sempozyumu Bildiriler Kitabi, 136-140, Kayseri (2004).
• F. Kurtulus, N. Alemdaroglu, Y. Özyörük, "Tüm Bir Uçak Konfigürasyonunun Seyir, Kalkis ve inis Durumlarindaki Aerodinamik Analizi," Uluslararasi Katilimli Kayseri IV. Havacilik Sempozyumu, Kayseri (2002).
• B. Narin, Y. Gögüs,Y. Özyörük, "Turbojet Motoru Kullanan Bir Isi Güç Sisteminin Termodinamik Analizi," GAP IV. Mühendislik Kongresi (2002).
• E. Alpman, Y. Özyörük, "Üst Üste Binmis Çözüm Aglari Üzerinde Vortex-Airfoil Etkilesiminin Sayisal ve Paralel Simülasyonu," Kayseri III. Havacilik Sempozyumu, Kayseri (2000).