Delayed Detached-Eddy Simulations of Transonic Cavity Noise

Date

2021-08-02

Author

Yalçın, Özgür
Özyörük, Yusuf

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

181
views

0
downloads

In this paper, computations of transonic (M=0.85) flow over an open cavity are performed through use of a high-order solver employing different Delayed Detached-Eddy Simulation (DDES) strategies: DDES, DDES with shear-layer-adapted subgrid length scale (DDES-SLA), and Improved DDES with SLA (IDDES-SLA). The cavity is considered to have no physical lateral walls, instead the computational domain inside the cavity is terminated in that direction by periodic or slip wall conditions. Different lateral domain sizes are studied. The length-to-depth ratio of the cavity is taken constant at $\bold{5}$ which matches that of the classical M219 cavity, and hence the simulated results are compared with available computational and experimental data for it. The results show that mean and turbulent flow fields at the midspan plane could be captured reasonably without lateral walls in the cavity, when the slip or periodic conditions are applied at least one depth separation. In addition, the use of the SLA length scale, which accelerates the transition to resolved turbulence in shear layers, helps capturing the Kelvin-Helmholtz instability dominated region, thereby providing better turbulent and acoustic related results than use of the standard one, i.e. the maximum cell dimension. Applying slip wall boundary condition at the lateral terminations of the cavity improves the velocity gradients over the periodic one, towards the aft wall which directly affects the sound levels emanating from the cavity ceiling. The best acoustic results are obtained by IDDES-SLA among all the tested, showing good agreement with those of the reference studies. The absence of viscous lateral walls in the cavity does not seem to have an impact on the sound levels except the region close to the front wall.

URI

https://doi.org/10.2514/6.2021-2165
https://hdl.handle.net/11511/95052

DOI

https://doi.org/10.2514/6.2021-2165

Conference Name

AIAA AVIATION FORUM 2021 - AEROACOUSTICS

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

DELAYED DETACHED-EDDY SIMULATION BASED PREDICTIONS OF BOUNDARY LAYER TRANSITION AND CAVITY FLOW NOISE Yalçın, Özgür; Özyörük, Yusuf; Department of Aerospace Engineering (2021-11-1) This dissertation investigates the boundary layer transition as well as the cavity flow noise prediction capabilities of a high-order in-house solver using various Delayed Detached-Eddy Simulation (DDES) frameworks. Before conducting the simulations, multiblock topology with a high-order overset grid technique is implemented into the solver, which makes mesh generation for complex geometries, such as the tunnel grids around blade sections, and cavity grids composed of two separate domains of the studied cas...
Real-Time Detection of Interharmonics and Harmonics of AC Electric Arc Furnaces on GPU Framework Uz-Logoglu, Eda; Salor, Ozgul; Ermiş, Muammer (2017-10-05) In this paper, a method based on the multiple synchronous reference frame (MSRF) analysis is recommended and implemented to detect time-varying harmonics and interharmonics of rapidly fluctuating asymmetrical industrial loads. The experimental work has been carried out on a typical three-phase alternating current arc furnace (AC EAF) installation. In the recommended method, the reference frame is rotated in both directions at speeds corresponding to the positive and negative sequences of all harmonics and a...
Real-Time Detection of Interharmonics and Harmonics of AC Electric Arc Furnaces on GPU Framework Uz-Logoglu, Eda; Salor, Ozgul; Ermiş, Muammer (2019-11-01) In this paper, a method based on the multiple synchronous reference frame analysis is recommended and implemented to detect time-varying harmonics and interharmonics of rapidly fluctuating asymmetrical industrial loads. The experimental work has been carried out on a typical three-phase alternating current arc furnace installation. In the recommended method, the reference frame is rotated in both directions at speeds corresponding to the positive and negative sequences of all harmonics and all interharmonic...
Quantitative analysis of nonlinear dynamics of quantum light transmission in strongly coupled quantum dot-cavity systems Tugen, Alperen; Kocaman, Serdar (Elsevier BV, 2019-04-01) We compared transmission spectra of coupled high-Q cavity with quantum dot (QD) systems in the strong coupling regime with Input-Output Formalism (IOF) and Incoherent Pumping Mechanism (IPM) based on Lindblad master equation approach. The peak transmission of Dipole Induced Transparency (DIT) together with its full-width-half-maximum (FWHM) are enquired for detailed analysis. Both methods exhibit the same vacuum Rabi splitting in on-resonant case, in contrast, the peak of DIT is estimated smaller between 50...
Heavy-isotope production in Xe-136 + Pb-208 collisions at E-c.m. =514 MeV Ayik, S.; Yılmaz, Osman; Yilmaz, B.; Umar, A. S. (2019-10-01) Employing the quantal diffusion mechanism for multinucleon transfer, the double differential cross sections are calculated for production of primary projectile-like and target-like fragments in collisions of Xe-136 + Pb-208 system at E-c.m. = 514 MeV. Including de-excitation due to neutron emission, the cross section for production of Po-210, Rn-222, and Ra-224 isotopes are estimated and compared with data.

Citation Formats

Ö. Yalçın and Y. Özyörük, “Delayed Detached-Eddy Simulations of Transonic Cavity Noise,” presented at the AIAA AVIATION FORUM 2021 - AEROACOUSTICS, Amerika Birleşik Devletleri, 2021, Accessed: 00, 2021. [Online]. Available: https://doi.org/10.2514/6.2021-2165.