Search Results - "Ekici, Kivanc"

A novel approach for flutter prediction of pitch–plunge airfoils using an efficient one-shot method by Li, Hang, Ekici, Kivanc

“…In this work, the one-shot method previously developed for the solution of limit cycle oscillation problems is extended to predict flutter boundaries of…”
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Supplemental-frequency harmonic balance: A new approach for modeling aperiodic aerodynamic response by Li, Hang, Ekici, Kivanc

“…Presented in this work is a novel and easy-to-implement supplemental-frequency harmonic balance (SF-HB) approach to efficiently compute dynamically aperiodic…”
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Natural laminar flow airfoil design via adjoint-based transition onset delay by Djeddi, Reza, Ekici, Kivanc

“…This work is focused on the aerodynamic shape optimization (ASO) of airfoils with the aim of attaining natural laminar flow (NLF) designs. The two-equation…”
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FDOT: A Fast, memory-efficient and automated approach for Discrete adjoint sensitivity analysis using the Operator overloading Technique by Djeddi, Reza, Ekici, Kivanc

“…A new toolbox based on operator overloading is introduced for automatic differentiation of scientific computing codes – and in particular legacy computational…”
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Revisiting the One-shot method for modeling limit cycle oscillations: Extension to two-degree-of-freedom systems by Li, Hang, Ekici, Kivanc

“…In this paper, the harmonic-balance-based One-shot method is extended to model limit-cycle-oscillations (LCO) for pitch/plunge airfoils. The difference of this…”
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Solution-based adaptive mesh redistribution applied to harmonic balance solvers by Djeddi, Reza, Ekici, Kivanc

“…A primary source of inaccuracy in numerical simulations is due to errors that are introduced into the solution via the discretization of the continuous…”
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Reduced-order model-based convergence acceleration of reverse mode discrete adjoint solvers by Kaminsky, Andrew L., Ekici, Kivanc

“…This work presents a new technique to reduce the computational cost of sensitivities calculated using a discrete adjoint solver developed via reverse mode…”
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Resolution of Gibbs phenomenon using a modified pseudo-spectral operator in harmonic balance CFD solvers by Djeddi, Reza, Ekici, Kivanc

“…A new pseudo-spectral operator is developed for time-spectral harmonic balance solutions of periodic unsteady flows. The method utilises a mechanism similar to…”
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A discrete adjoint harmonic balance method for turbomachinery shape optimization by Huang, Huang, Ekici, Kivanc

“…The harmonic balance method has seen an increasing popularity in the solution of time-periodic problems because of its computational efficiency and its ability…”
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Modeling periodic and non-periodic response of dynamical systems using an efficient Chebyshev-based time-spectral approach by Ekici, Kivanc, Djeddi, Reza, Li, Hang, Frankel, Jay I.

“…•Chebyshev-based time-spectral method introduced to efficiently model nonlinear systems.•The technique is applied to compressible and incompressible CFD…”
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An efficient harmonic balance method for unsteady flows in cascades by Huang, Huang, Ekici, Kivanc

“…In this paper, nonlinear unsteady flows in cascades arising from self-excited blade vibrations are investigated using a mixed time/frequency domain harmonic…”
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A fully coupled turbulent low-speed preconditioner for harmonic balance applications by Djeddi, Reza, Howison, Jason, Ekici, Kivanc

“…Aeromechanical design of wind turbines requires a high-fidelity analysis toolbox that can cover a wide spectrum of flow speeds from incompressible to…”
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Convergence acceleration of continuous adjoint solvers using a reduced‐order model by Kaminsky, Andrew L., Djeddi, Reza, Ekici, Kivanc

“…Summary A novel acceleration technique using a reduced‐order model is presented to speed up convergence of continuous adjoint solvers. The acceleration is…”
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Deflection predictions of involute-shaped fuel plates using a fully-coupled numerical approach by Curtis, Franklin G., Freels, James D., Ekici, Kivanc

“…This paper describes the modeling and simulation of fluid structure interactions (FSI) of involute-shaped fuel plates used in nuclear research reactors. We…”
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Counter cross-flow evaporator geometries for supercritical organic Rankine cycles by Nejad, Ali H., Ekici, Kivanc, Sabau, Adrian S., Bejan, Adrian, Arimilli, Rao V.

“…•A new Constructal law-based design is presented for cross-flow heat exchangers.•Compared to cross-flow design, the thermal performance is increased as much as…”
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Harmonic balance methods applied to computational fluid dynamics problems by Hall, Kenneth C., Ekici, Kivanc, Thomas, Jeffrey P., Dowell, Earl H.

“…In this paper, we briefly review the classical harmonic balance method, and describe the adaptation of the method required for its application to computational…”
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Thermal-hydraulics modeling for prototype testing of the W7-X high heat flux scraper element by Clark, Emily, Lumsdaine, Arnold, Boscary, Jean, Greuner, Henri, Ekici, Kivanc

“…•Comparison of computational results to experimental measurements for W7-X PFCs.•Single-phase thermal hydraulics modeling performed to study manufacturing…”
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Computationally fast harmonic balance methods for unsteady aerodynamic predictions of helicopter rotors by Ekici, Kivanc, Hall, Kenneth C., Dowell, Earl H.

“…A harmonic balance technique for the analysis of unsteady flows about helicopter rotors in forward flight and hover is presented in this paper. The…”
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Novel evaporator architecture with entrance-length crossflow-paths for supercritical Organic Rankine Cycles by Sabau, Adrian S., Nejad, Ali H., Klett, James W., Bejan, Adrian, Ekici, Kivanc

“…Here in this article, a novel geometry is proposed for evaporators that are used in Supercritical Organic Rankine Cycles. The proposed geometry consists of…”
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Novel evaporator architecture with entrance-length crossflow-paths for supercritical Organic Rankine Cycles by Sabau, Adrian S., Nejad, Ali H., Klett, James W., Bejan, Adrian, Ekici, Kivanc

“…•Introduced new multi-scale heat exchangers based on thermal entrance length flow paths.•Estimated the cost of newly designed heat exchangers by considering…”
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