Uğur Karban

E-mail

ukarban@metu.edu.tr

Department

Department of Aerospace Engineering

A nonlinear toy model for jet noise modelling and control Karban, Uğur; Martini, Eduardo; Jordan, Peter (2025-08-29) Modelling and controlling jet noise are a notoriously difficult tasks, particularly at subsonic levels, dueto the subtlety of noise-generating mechanisms. Developing reduced-order models to study thesemechanisms and possib...
RESOLVENT OPTIMISATION VIA NONLINEAR VARIABLE TRANSFORMATION Karban, Uğur; Cavalieri, Andre V.G.; Jordan, Peter; Colonius, Tim (2023-06-30) In a previous study [1], we showed mean-flow-based linear analysis depends on the choice of dependentvariables. It was argued that this ambiguity could be used for optimization of resolvent-based models viaspecific choice ...
Ambiguity in mean-flow-based linear analysis Karban, Uğur; Bugeat, B.; Martini, E.; Towne, A.; Cavalieri, A. V. G.; Lesshafft, L.; Agarwal, A.; Jordan, P.; Colonius, T. (2020-10-01) Linearisation of the Navier-Stokes equations about the mean of a turbulent flow forms the foundation of popular models for energy amplification and coherent structures, including resolvent analysis. While the Navier-Stokes...
AMBIGUITY IN MEAN-FLOW-BASED LINEAR ANALYSIS Karban, Uğur; Martini, Eduardo; Bugeat, Benjamin; Towne, Aaron; Cavalieri, Andre V.G.; Lesshafft, Lutz; Agarwal, Anurag; Jordan, Peter; Colonius, Tim (2020-08-28) The effect of a variable transformation on the linear operator that is obtained by linearizing a turbulent flow about its mean is investigated. It is shown that the characteristics of the linear operator are dependent on t...
Hybrid methods for the prediction of the noise radiated by a Mach 0.5 ducted orifice flow Jardon, Zoé; Karban, Uğur; Christophe, Julien; Schram, Christophe F. (2018-01-01) The present work aims at comparing the predictions that are obtained, for the noise emitted by a ducted diaphragm, using a numerical acoustic simulation and an analytical Green’s function. In both cases the flow model is o...
Modal identification of aeroacoustic systems using passive and active approaches Karban, Uğur; Schram, Christophe (2017-12-01) The noise generated by a ducted diaphragm configuration, taken in this paper as a prototype aeroacoustic system, is investigated experimentally using a two-port source identification method [Lavrentjev, Abom, and Boden (19...
Tailored Green's Functions for the Prediction of the Noise Generated by Single and Tandem Diaphragms in a Circular Duct Karban, Uğur; Schram, C.; Sovardi, C.; Polifke, W. (2016-09-01) Noise produced by single and tandem diaphragms in a duct is studied on the basis of compressible Large Eddy Simulation. The applicability and accuracy of a hybrid approach that combines Lighthill's analogy [1] data and Gre...
Noise produced by a tandem diaphragm: Experimental and numerical investigations Karban, Uğur; Kucukcoskun, Korcan; Ogus, Guven; Schram, Christophe; Sovardi, Carlo; Polifke, Wolfgang (2014-01-01) The aeroacoustic installation effects of a ducted tandem diaphragm on are investigated experimentally and numerically. Two different numerical methods are applied to estimate the noise prediction: a scale-resolved approach...

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