High-order detached eddy simulation of unsteady flow around NREL S826 airfoil

WINERCOST’xx17 - The International Conference on Wind Harvesting 2017, (20 - 21 Nisan 2017)


High-order detached eddy simulation of unsteady flow around NREL S826 airfoil
Yalçın, Özgür; Özyörük, Yusuf (Elsevier BV, 2018-08-01)
Delayed detached eddy simulation (DDES) has been a common approach for unsteady turbulent flow problems, but it has several weaknesses which limit its use to detached flows. On the other hand, some enhancements introduced recently have made it possible to apply to attached flows as well. In the present investigation, flow with relatively low Reynolds numbers of 100, 000 and 145, 000 around NREL S826 airfoil is simulated using DDES models with two different length scale definitions: standard length scale and...
High-frequency loss calculation in a smooth rotor induction motor using FEM
Ertan, Hulusi Bülent; Leblebicioğlu, Mehmet Kemal (2007-09-01)
In this paper, a new approach for the calculation of high-frequency losses in induction motors is presented. The input to the motors is assumed to be supplied from a sinusoidal voltage source. The method is based on the two-dimensional (2-D)). field solutions of the magnetic circuit, obtained by using a nonlinear "harmonic" solution. Hence, the solution time is very short. From the "harmonic" solution, the air-gap field distribution as well as the fundamental frequency eddy current losses are determined. Th...
High-Resolution Solar Imaging With Photon Sieves
Öktem, Sevinç Figen; Davila, Joseph M (2014-12-15)
A photon sieve is a modification of a Fresnel zone plate in which open zones are replaced by a large number of circular holes. This lightweight optical device offers a superior image forming capability compared with the Fresnel zone plate, and is specially suited to observations at UV and x-ray wavelengths where refractive lenses are not available due to strong absorption of materials, and reflective mirrors are difficult to manufacture to achieve near diffraction-limited resolution. At these shorter wavele...
High-performance parallel hexapod-robotic light abrasive grinding using real-time tool deflection compensation and constant resultant force control
Latifinavid, Masoud; Donder, Abdulhamit; Konukseven, Erhan İlhan (Springer Science and Business Media LLC, 2018-06-01)
In robotic grinding, significant tool deflection occurs due to the lower stiffness of the manipulator and tool, compared with operation by universal grinding machines. Tool deflection during robotic grinding operation causes geometrical errors in the workpiece cross section. Also, it makes difficult to control the grinding cutting depth. In this study, a method is proposed for calculation of the tool deflection in normal and tangential directions based on grinding force feedback in these directions. Based o...
High-resolution multi-spectral imaging with diffractive lenses and learned reconstruction
Kar, Oguzhan Fatih; Öktem, Sevinç Figen; Kamalabadi, Farzad; Bezek, Can Deniz (2021-01-01)
Spectral imaging is a fundamental diagnostic technique with widespread application. Conventional spectral imaging approaches have intrinsic limitations on spatial and spectral resolutions due to the physical components they rely on. To overcome these physical limitations, in this paper, we develop a novel multi-spectral imaging modality that enables higher spatial and spectral resolutions. In the developed computational imaging modality, we exploit a diffractive lens, such as a photon sieve, for both disper...
Citation Formats
Ö. Yalçın and Y. Özyörük, “High-order detached eddy simulation of unsteady flow around NREL S826 airfoil,” presented at the WINERCOST’xx17 - The International Conference on Wind Harvesting 2017, (20 - 21 Nisan 2017), 2017, Accessed: 00, 2021. [Online]. Available: http://www.winercost.com/cost_files/WINERCOST17_Proceedings_Book.pdf.