Department of Aerospace Engineering

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Recent Submissions

Effect of microdamage on the failure of open-hole UD GFRP laminates: A combined experimental and numerical study Şener, Özgün; Kayran, Altan (2026-02-01) The effect of microdamaging on the failure of unidirectional Interglas 92145/CR80 GFRP laminates is studied through experiments and a numerical approach combining Enhanced Schapery Theory (EST) and Crack Band Theory (CBT)....
Investigation of Ignition Overpressure Over a Launch Pad using Open-Source CFD Solvers Danışan, Ercan Umut; Iriolya, Tohid Ghorbani; Duru, Murat Özüm; Gündem, Doğukan; Eyi, Sinan (2026-01-01) During rocket ignition and liftoff, strong transient pressure waves propagate within the launch pad environment and impinge on the launch vehicle, flame deflector and surrounding structures. Controlling pressure waves play...
Modelling of Damage and Failure in Multi-Phase Microstructures through Phase Field Fracture Erdoğan, Can; Yalçınkaya, Tuncay (2026-01-01) Multi-phase materials, such as fiber reinforced composites, metal matrix composites, or dual-phase steels, contain two or more contrasting phases within their microstructures. The coexistence of hard/brittle phases with so...
Numerical Investigation of Water Injection Effects on Jet Centerline Temperature and Ignition Overpressure by Using OpenFOAM Irirolya, Tohid Ghorbani; Eyi, Sinan; Tsutsumi, Seiji (2026-01-01) Analyzing and correctly designing of the launch environment is necessary for haveing a safe and successful launch. During launch, two kinds of pressure waves appear: (1) ignition overpressure (IOP) waves and (2) acoustic w...
Transitional separated flow over low-aspect-ratio NACA0012 wings Anılır, Berkan; Kouser, Taiba; Kurtuluş, Dilek Funda; Goli, Srikanth; Sabih, Muhammad; Imran, Imil Hamda; Memon, Azhar; Alhems, Luai M. (2026-01-01) Three-dimensional transitional separated flow over low-aspect-ratio NACA0012 wings (semi-aspect ratios of sAR = 1 and 2) is numerically investigated at Reynolds numbers of 1 × 104 and 4 × 104, across a range of angles of a...
Computational investigation of low-Reynolds-number unsteady flows past NACA 0012 Güney, Mertcan; Anılır, Berkan; Kurtuluş, Dilek Funda (2026-01-01) The aerodynamic characteristics of airfoils are significantly governed by the Reynolds number, particularly in the low Reynolds number regime (Re < 1 × 105), where viscous forces predominate over inertial forces, promoting...
Numerical Analysis of a Flame Deflector Using Reactive an Non-Reactive Flow Models Irirolya, Tohid Ghorbani; Eyi, Sinan; Tsutsumi, Seiji (2026-01-01) During the ignition of solid and liquid rocket motors, ignition overpressure (IOP) wave is generated. The IOP is caused by the rapid expansion of exhaust gases, which compress the surrounding air and behaves like blast wav...
Swirl and Jet Flow Interaction over Film-Cooling Plates Arslan Arslane@Metu.Edu.Tr, Enes; Başkan Perçin, Özge; Perçin, Mustafa; Uzol, Oğuz; Turkeri, Hasret (2026-01-01) This study experimentally investigates the film-cooling effectiveness and associated flowfield characteristics of two plate geometries subjected to both uniform and swirling inflow conditions. The first configuration is a ...
Numerical Analysis of Pressure Wave Propagation at Rocket Launch Pads Using Open-Source CFD Solvers Gündem, Doğukan; Iriolya, Tohid Ghorbani; Danışan, Ercan Umut; Ç Etin, Esra Buse; Atılkan, Yavuz; Eyi, Sinan (2026-01-01) Ignition overpressure (IOP) waves are generated during ignition of the rocket. IOP is a transient phenomenon that occurs as a sudden burst of exhaust gases during lift-off. This wave has a high pressure magnitude and a rel...
Mitigation of Ignition Overpressure in Launch Pads via Unsteady Adjoint-Based Optimization Danışan, Ercan Umut; Eyi, Sinan (2026-01-01) The solid rocket boosters (SRBs) of space launch vehicles generate powerful Ignition Overpressure (IOP) waves during the early stages of lift-off. These IOP waves propagate through launch environment and are reflected back...
Impact of Shock Boundary Layer Interaction on Swirl Characteristics in Supersonic Intakes with Bleed System Özcan, Muhammed Enes; Sezer Uzol, Nilay (2026-01-01) Flow quality at the engine face, in particular total pressure distribution and swirl characteristics, is critical for the aerodynamic performance and stability of external compression supersonic inlets. Shock wave boundary...
Aerodynamic Analysis of Wind Turbine Airfoils with a Nested Krylov Subspace Solver Implementation in SU2 Akcengiz, Ezgi Orbay; Sezer Uzol, Nilay (2026-01-01) Accurate aerodynamic characterization of wind turbine airfoils is important for optimizing rotor performance, particularly at high Reynolds numbers where phenomena such as stall and transition significantly affect lift and...
Numerical Investigation of Gaps and Overlaps in Variable Stiffness Composites Using Alternative Defect Modeling Approaches Demirer, Halime Gül; Kayran, Altan (2026-01-01) This study examines the structural response of variable stiffness (VS) composite laminates manufactured by Automated Fiber Placement (AFP), focusing on the effects of gaps and overlaps on buckling and post-buckling damage ...
Numerical Study of Combustion Instabilities in a Single Injector Combustor Öztürkmen, Musa Onur; Özyörük, Yusuf (2026-01-01) The interactions between the unsteady heat release rate and pressure fluctuations in a combustion chamber may lead to thermoacoustic instabilities depending on the phase relationship between the two. In many instances, the...
An adaptive phase field model for high cycle fatigue analysis across specimen geometries Chen, Guangxu; Erdoğan, CAN; Yalçınkaya, Tuncay; Wang, Xianqiao; Tang, Keke (2025-12-01) High cycle fatigue behavior of components with notches and cracks, which are common in engineering applications, is significantly influenced by geometrical size effect and complicates accurate fatigue life prediction. Trad...
Analysis of the size effect in the nanoscratching process of single crystalline and polycrystalline materials Günay, Enes; Yalçınkaya, Tuncay (2025-12-01) In tribology, nanoscratch testing is used to evaluate the mechanical and tribological properties of materials by employing a nanoscale indenter. At this scale, size-dependent plasticity effects, particularly those related ...
Post heat treatment optimization of cold spray additive manufactured Inconel 718 Karakas, Aptullah; Ataee, Arash; Rathi, Amit; Fenercioglu, Tevfik Ozan; Erdoğan, Can; Yalçınkaya, Tuncay (2025-12-01) The cold spray technique has recently emerged as an additive manufacturing method for producing free-standing parts, in addition to its use in repair and coating applications. Manufacturing relatively hard alloys such as I...
Trajectory tracking controller design and simulation of a tethered aircraft Onen, Anil Sami; Tekinalp, Ozan (2025-11-11) This study addresses the control problem of an airborne wind energy aircraft, generating power on the ground. The proposed control tracks a pre-defined trajectory in the power generation phase. The reference attitude infor...
Explicit Crystal Plasticity Modeling of Texture Evolution in Nonlinear Twist Extrusion Şimşek, Ülke; Miyamoto, Hiroyuki; Yalçınkaya, Tuncay (2025-11-01) The Nonlinear Twist Extrusion (NLTE) method, a novel severe plastic deformation (SPD) technique, aims to enhance grain refinement and achieve a more uniform plastic strain distribution. Grain size and its uniform distribut...
Accurate Computation of Multiphase Flows with high-density and pressure ratios using Smoothed Particle Hydrodynamics ERBAŞ, MURAT; Atcı, Metehan; Karaca, Mehmet; BIYIKOĞLU, ATİLLA (2025-10-30) This article discusses the applications of the smoothed particle hydrodynamics (SPH) methods to propose adaptations for compressible flow problems, particularly with discontinuities: shock tube, cavitation shock tube, and ...

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