Anil Yildirim

Anil Yildirim
University of Michigan | U-M · Department of Aerospace Engineering

About

18
Publications
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301
Citations

Publications

Publications (18)
Article
Hydrodynamic lifting surfaces usually include junctions. High-fidelity simulations are necessary to capture critical physics near these regions, such as separation, junction vortices, and cavitation. We present RANS-based hydrodynamic optimizations of a T-shaped hydrofoil, including changes in the junction geometry. The optimized hydrofoils avoid s...
Conference Paper
Full-text available
Advances in aeropropulsive design optimization provide new capabilities for the study of tightly integrated propulsion systems. New techniques that couple CFD solvers to thermodynamic cycle analyses showed increased robustness and proved the viability of a fully coupled approach using gradient-based optimization. However, existing work in this area...
Conference Paper
Full-text available
The aerodynamic design of aircraft often involves evaluating flow conditions that span low subsonic to transonic, or even supersonic Mach numbers. Compressible flow solvers are a natural choice for such design problems, but these solvers encounter reduced accuracy and efficiency at low Mach numbers. In addition, simulations with supersonic conditio...
Conference Paper
Full-text available
View Video Presentation: https://doi.org/10.2514/6.2022-3384.vid This paper presents the results of the optimisation of aerofoils designed for the blades of a vertical axis wind turbine. The aerofoils are symmetrical and have thickness values of 27%, 33% and 50\%, with respect to the chord length. The aerofoils are optimised using ADflow, an open-s...
Article
Full-text available
Aerodynamic shape optimization based on computational fluid dynamics (CFD) requires three steps: updating the geometry based on the design variables, updating the CFD surface mesh for the new geometry, and updating the CFD volume mesh based on the new surface mesh. While there are many tools available for the first and third steps, the methods avai...
Article
Full-text available
The inclusion of transition to turbulence effects in computational fluid dynamics (CFD) simulations makes it possible to design laminar flow airframes. It also increases the level of physical representations for simulations of standard airframes because laminar flow regions may be present in parts of the aircraft in multiple flight conditions. Modi...
Article
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Boundary-layer ingestion (BLI) offers the potential for significant fuel burn reduction by exploiting tightly coupled aeropropulsive effects. NASA’s Single-aisle Turboelectric Aircraft with Aft Boundary-Layer propulsion (STARC-ABL) concept employs BLI on an electrically powered tail cone thruster to take advantage of the technology on what is other...
Conference Paper
Full-text available
Urban air mobility vehicles have taken form as advanced rotorcraft with sets of wings, rotors, canards, and other appendages. Noise generation is an important technical barrier that must be addressed to prevent these vehicles from causing excessive disturbance to the communities they are intended to service. There is a need for efficient and low-fi...
Conference Paper
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View Video Presentation: https://doi.org/10.2514/6.2021-3032.vid New aircraft concepts increasingly rely on non-traditional propulsion systems to achieve lower energy consumption. These non-traditional technologies, such as boundary layer ingestion or distributed electric propulsion, require tight integration of the propulsion system to the airfram...
Conference Paper
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The performance and scalability of computational fluid dynamics (CFD) solvers are essential for many applications, including multidisciplinary design optimization. With the evolution of high-performance computing resources such as Intel's Knights Landing and Skylake architectures in the Stampede2 cluster, CFD solver performance can be improved by mo...
Conference Paper
Full-text available
Boundary layer ingestion (BLI) offers the potential for significant fuel burn reduction by exploiting strong aeropropulsive interactions. NASA's STARC-ABL concept uses an electrically powered BLI tail cone thruster on what is otherwise a conventional airframe. Despite this conventional airframe, aeropropulsive integration is critical to the perform...
Thesis
Design and integration of advanced propulsion systems play a critical role in the development of environmentally sustainable aircraft. Even though these advanced technologies, such as boundary layer ingestion, offer significant aeropropulsive benefits, their design is challenging due to the tightly coupled nature of these systems, as well as the la...
Article
Full-text available
Computational fluid dynamics through the solution of the Navier–Stokes equations with turbulence models has become commonplace. However, simply solving these equations is not sufficient to be able to perform efficient design optimization with a flow solver in the loop. This paper discusses the recommendations for developing a flow solver that is su...
Article
Full-text available
The favorable convergence rates of Newton–Krylov-based solution algorithms have increased their popularity for computational fluid dynamics applications. Unfortunately, these methods perform poorly during the initial stages of convergence, particularly for three-dimensional Reynolds-averaged Navier–Stokes simulations. Addressing this problem requir...
Article
Full-text available
Aerodynamic design optimization currently lacks robustness with respect to the starting design and requires trial and error in the flow solver and optimization algorithm settings to get a converged optimal design. We address this issue by developing ways to overcome robustness issues arising from shape parametrization, mesh deformation, and flow so...

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