Aeroacoustic Characterization of T-Junctions Based on Large Eddy Simulation and System Identification

2010 ◽  
Author(s):  
Stephan Föller ◽  
Wolfgang Polifke ◽  
Devis Tonon
Keyword(s):  
System Identification ◽  
Large Eddy Simulation ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals Direct Assessment of the Acoustic Scattering Matrix of a Turbulent Swirl Combustor by Combining System Identification, Large Eddy Simulation and Analytical Approaches

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Malte Merk ◽  
Camilo Silva ◽  
Wolfgang Polifke ◽  
Renaud Gaudron ◽  
Marco Gatti ◽  
...  
Keyword(s):  
System Identification ◽  
Large Eddy Simulation ◽  
Transfer Matrix ◽  
Acoustic Scattering ◽  
Scattering Matrix ◽  
Series Data ◽  
Swirl Combustor ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Analytical Approaches

This study assesses and compares two alternative approaches to determine the acoustic scattering matrix of a premixed turbulent swirl combustor: (1) The acoustic scattering matrix coefficients are obtained directly from a compressible large eddy simulation (LES). Specifically, the incoming and outgoing characteristic waves f and g extracted from the LES are used to determine the respective transmission and reflection coefficients via System Identification (SI) techniques. (2) The flame transfer function (FTF) is identified from LES time series data of upstream velocity and heat release rate. The transfer matrix of the reactive combustor is then derived by combining the FTF with the Rankine–Hugoniot (RH) relations across a compact heat source and a transfer matrix of the cold combustor, which is deduced from a linear network model. Linear algebraic transformation of the transfer matrix consequently yields the combustor scattering matrix. In a cross-comparison study that includes comprehensive experimental data, it is shown that both approaches successfully predict the scattering matrix of the reactive turbulent swirl combustor.

scholarly journals Characterization of the wake of a submarine propeller via Large-Eddy simulation

2019 ◽  
Vol 184 ◽  
pp. 138-152 ◽  
Author(s):  
Antonio Posa ◽  
Riccardo Broglia ◽  
Mario Felli ◽  
Massimo Falchi ◽  
Elias Balaras
Keyword(s):  
Large Eddy Simulation ◽  
Eddy Simulation ◽  
Large Eddy

Large-Eddy Simulation-Based Characterization of Suction and Oscillatory Blowing Fluidic Actuator

AIAA Journal ◽  
2017 ◽  
Vol 55 (8) ◽  
pp. 2566-2579 ◽  
Author(s):  
Jeonglae Kim ◽  
Parviz Moin ◽  
Avraham Seifert
Keyword(s):  
Large Eddy Simulation ◽  
Eddy Simulation ◽  
Simulation Based ◽  
Large Eddy
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