Department of Aerospace Engineering, Article

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Recent Submissions

Surrogate model based optimization of variable stiffness composite wingbox for improved buckling load with manufacturing and failure constraints Inci, Hasan; Kayran, Altan (2025-01-01) The buckling load of a wingbox is maximized by applying different automatic fiber placement (AFP) strategies on the skins of the wing having NACA 4412 airfoil profile. Specifically, the effect of single, dual and three reg...
Design Optimization of a Novel Flush Boundary Layer Diverter Kucuk, Umut Can; Tuncer, İsmail Hakkı (2024-12-01) A novel boundary layer diverter is designed and optimized for increasing the performance of a typical semi-submerged inlet ingesting large amounts of boundary layer flow. A conceptual diverter configuration based on the pr...
Relative position estimation using modulated magnetic field for close proximity formation flight Shibata, Takuma; Söken, Halil Ersin; Sakai, Shin-ichiro (2024-12-01) This paper presents a method to estimate relative position vectors between spacecraft equipped with magnetic coils and magnetic field sensors for close proximity operation. Filters can segregate a magnetic field with a par...
Numerical and experimental investigations of swirl-stabilized partially premixed flames using natural gas-hydrogen-air mixtures Böncü, Emre; Güleryüz, Dilay; Karaca, Mehmet; Allouis, Christophe Gerard; Gökalp, İskender (2024-10-01) This study uses experimental and numerical techniques to examine natural gas and hydrogen mixtures as fuel with a partially premixed swirl-stabilized burner. Variations in the fuel mixture composition were investigated thr...
Three-dimensional flows in the wake of a non-cavitating and cavitating marine propeller Başkan Perçin, Özge; Fiscaletti, Daniele; Elsinga, Gerrit E.; Van Terwisga, Tom (2024-09-01) Tip-vortex cavitation is among the first forms of cavitation to appear around ship propellers. In the present study, the time-resolved three-dimensional flow field around non-cavitating and cavitating tip vortices in the w...
Bioinspired soft-hard interfaces fabricated by multi-material additive manufacturing: A fracture mechanics investigation using essential work of fracture ALTUNTAŞ, UMUT; Çöker, Demirkan; Yavas, Denizhan (2024-08-01) This study employs the Essential Work of Fracture (EWF) concept to evaluate the interfacial fracture toughness of bioinspired interfaces between soft and hard polymer phases. The experimental framework utilizes a model mat...
A Comparative Study on the Efficiencies of Aerodynamic Reduced Order Models of Rigid and Aeroelastic Sweptback Wings Özkaya Yılmaz, Özge; Kayran, Altan (2024-08-01) This paper presents the effect of wing elasticity on the efficiency of a nonintrusive reduced order model using a three-dimensional sweptback wing. For this purpose, a computationally low-cost but highly accurate nonintrus...
Experimental investigation of momentum ratio and impingement angle effects on spray characteristics of triplet and pentad injectors Gulmez, Senem; Kahveci, Harika Senem (2024-07-01) A comprehensive experimental investigation is conducted to analyze the effects of momentum ratio and impingement angle on impinging spray characteristics of triplet and pentad injectors by using Phase Doppler Anemometry (P...
Effect of flame characteristics on an isolated ethanol droplet evaporating through stagnation methane/air flames: An experimental and numerical study Kaya Eyice, Deniz; Karaca, Mehmet; Halter, Fabien; Gökalp, İskender; Chauveau, Christian (2024-07-01) A single ethanol droplet evaporation through laminar methane/air stagnation flame is investigated at lean, stoichiometric and rich conditions experimentally and numerically. For the droplets having initial diameters of 20-...
A non-iterative boundary element formulation for nonlinear viscoelasticity Akay, Ahmet Arda; Gürses, Ercan; Göktepe, Serdar (2024-06-01) In this study, we propose a non-iterative boundary element method (BEM) of highly nonlinear viscoelasticity in time domain. The computationally attractive iteration-free algorithmic structure is achieved by the linearizati...
FARKLI KİMYASAL YÜZEY İYİLEŞTİRME İŞLEMLERİNİN PİRİNÇ KABUĞU EPOKSİ KOMPOZİT MALZEMELERİN MEKANİK ÖZELLİKLERİNE ETKİSİ Demirtaş, Mehmet Selim; Avcıoğlu, Emir; Güloğlu, Görkem Eğemen (2024-06-01) Bazı tarım ürünlerinin atık kısımlarında bulunan lifli yapılar, polimer matrisli kompozit malzemeler içerisinde takviye veya dolgu malzemesi olarak kullanılmaktadırlar. Pirinç kabuğu da bu yapıdaki tarımsal atıklarına örne...
Investigation of failure mechanisms in dual-phase steels through cohesive zone modeling and crystal plasticity frameworks Aydiner, Ilbilge Umay; Tatlı, Berkehan; Yalçinkaya, Tuncay (2024-03-01) Dual-phase (DP) steels are characterized by their good formability and interesting material properties, which primarily originate from their unique composition, combining the ductile ferrite phase with the hard martensite ...
Comparison of Linear and Nonlinear Twist Extrusion Processes with Crystal Plasticity Finite Element Analysis Şimşek, Ülke; Davut, Kemal; Miyamoto, Hiroyuki; Yalçınkaya, Tuncay (2024-03-01) The mechanical characteristics of polycrystalline metallic materials are influenced significantly by various microstructural parameters, one of which is the grain size. Specifically, the strength and the toughness of polyc...
High Aspect Ratio Composite Wings: Geometrically Nonlinear Aeroelasticity, Multi-Disciplinary Design Optimization, Manufacturing, and Experimental Testing Farsadi, Touraj; Ahmadi, Majid; Şahin, Melin; Haddad Khodaparast, Hamed; Kayran, Altan; Friswell, Michael I. (2024-03-01) In the field of aerospace engineering, the design and manufacturing of high aspect ratio composite wings has become a focal point of innovation and efficiency. These long, slender wings, constructed with advanced materials...
Phase field modeling of fatigue crack growth retardation under single cycle overloads Waseem, Sarim; Erdoğan, Can; Yalçınkaya, Tuncay (2024-02-01) A zone-based crack retardation model that responds to single cycle overloads is applied to a phase field fatigue framework. Fatigue crack growth is incorporated through the degradation of fracture toughness in the phase fi...
High-fidelity simulations of low-velocity impact induced matrix cracking and dynamic delamination progression in CFRP beams Batmaz, Onur Ali; Bozkurt, Mirac Onur; Gürses, Ercan; Çöker, Demirkan (2024-02-01) A high-fidelity finite element model is constructed to simulate the low-velocity line-impact experiments conducted by Bozkurt and Coker on [05/903]s CFRP beams. The simulations utilize a user-implemented three-dimensional ...
Three-dimensional flow evaluation of monarch butterfly wing Comez, Fadile Yudum; Sengil, Nevsan; Kurtuluş, Dilek Funda (2024-01-01) The current study aims to examine the flow field around a monarch butterfly wing at different angles of attack. A fully opened forewing configuration for the monarch butterfly wing has been selected for analysis at a maxim...
High-speed observation of dynamic delamination failure in tapered composite laminates under tensile loading Bozkurt, Mirac Onur; ÖZEN, EMİNE BURÇİN; Yavuz, Burak Ogun; Parnas, Kemal Levend; Çöker, Demirkan (2024-01-01) This article presents high-fidelity observations of the time evolution of unstable delamination growth in tapered composite beams under tensile loading via ultra-high-speed camera in conjunction with digital image correlat...
Adjoint based aerodynamic shape optimization of a semi-submerged inlet duct and upstream inlet surface Küçük, Umut Can; Tuncer, İsmail Hakkı (2024-01-01) Aerodynamic performance of a semi-submerged inlet exposed to a significant amount of boundary layer ingestion is optimized using the open-source flow and adjoint solver SU2. Pressure recovery is taken as the objective func...
Distributed Robust Formation Control of Heterogeneous Multi-UAVs with Disturbance Rejection Imran, Imil Hamda; Kurtuluş, Dilek Funda; Memon, Azhar M.; Goli, Srikanth; Kouser, Taiba; Alhems, Luai Muhammad (2024-01-01) This paper investigates the formation control of multiple heterogeneous quadrotor unmanned aerial vehicles (UAVs). The research focuses on developing a distributed robust formation control strategy to effectively manage th...

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