Numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation

In the present work, indirect noises generated by compositional disturbances in a non-isotropic convergent nozzle are studied using Large Eddy Simulations (LESs). An in-house compressible LES code, Boundary Fitted Flow Integrator-LESc, is utilized to simulate the noise generation in the system. A no...

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Autores principales:	Y. Gong, W. P. Jones, A. J. Marquis
Formato:	article
Lenguaje:	EN
Publicado:	AIP Publishing LLC 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/99d0ee9be2b442369dc29aa8cedb210a
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spelling	oai:doaj.org-article:99d0ee9be2b442369dc29aa8cedb210a2021-12-01T18:52:06ZNumerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation2158-322610.1063/5.0065959https://doaj.org/article/99d0ee9be2b442369dc29aa8cedb210a2021-11-01T00:00:00Zhttp://dx.doi.org/10.1063/5.0065959https://doaj.org/toc/2158-3226In the present work, indirect noises generated by compositional disturbances in a non-isotropic convergent nozzle are studied using Large Eddy Simulations (LESs). An in-house compressible LES code, Boundary Fitted Flow Integrator-LESc, is utilized to simulate the noise generation in the system. A non-reflective outlet boundary condition is used to eliminate numerical reflections and to ensure the reproduction of the operating conditions in the experiments. The experiments are designed to feature two configurations with different injection positions, which enable the separation of direct and indirect noises. Different operating conditions are investigated, including different injection gases and air mass flow rates. This present paper compares computational results with the experimental measurements. The results revealed that the processes of direct and indirect noise generation are successfully reproduced in the LES, with the noise magnitudes in good agreement with those in the measurements. Injection of gases with smaller (He) and larger (CO2) molar masses compared to air is found to generate negative and positive indirect noises, respectively, in the LES, which is consistent with the experimental findings. The effect of different air mass flow rates is also investigated and discussed, and the direct noise and indirect noise amplitudes are both found to be closely related to the air mass flow rate.Y. GongW. P. JonesA. J. MarquisAIP Publishing LLCarticlePhysicsQC1-999ENAIP Advances, Vol 11, Iss 11, Pp 115103-115103-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Y. Gong W. P. Jones A. J. Marquis Numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation
description	In the present work, indirect noises generated by compositional disturbances in a non-isotropic convergent nozzle are studied using Large Eddy Simulations (LESs). An in-house compressible LES code, Boundary Fitted Flow Integrator-LESc, is utilized to simulate the noise generation in the system. A non-reflective outlet boundary condition is used to eliminate numerical reflections and to ensure the reproduction of the operating conditions in the experiments. The experiments are designed to feature two configurations with different injection positions, which enable the separation of direct and indirect noises. Different operating conditions are investigated, including different injection gases and air mass flow rates. This present paper compares computational results with the experimental measurements. The results revealed that the processes of direct and indirect noise generation are successfully reproduced in the LES, with the noise magnitudes in good agreement with those in the measurements. Injection of gases with smaller (He) and larger (CO2) molar masses compared to air is found to generate negative and positive indirect noises, respectively, in the LES, which is consistent with the experimental findings. The effect of different air mass flow rates is also investigated and discussed, and the direct noise and indirect noise amplitudes are both found to be closely related to the air mass flow rate.
format	article
author	Y. Gong W. P. Jones A. J. Marquis
author_facet	Y. Gong W. P. Jones A. J. Marquis
author_sort	Y. Gong
title	Numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation
title_short	Numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation
title_full	Numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation
title_fullStr	Numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation
title_full_unstemmed	Numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation
title_sort	numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation
publisher	AIP Publishing LLC
publishDate	2021
url	https://doaj.org/article/99d0ee9be2b442369dc29aa8cedb210a
work_keys_str_mv	AT ygong numericalanalysisofindirectnoisegeneratedbycompositionalinhomogeneitiesusinglargeeddysimulation AT wpjones numericalanalysisofindirectnoisegeneratedbycompositionalinhomogeneitiesusinglargeeddysimulation AT ajmarquis numericalanalysisofindirectnoisegeneratedbycompositionalinhomogeneitiesusinglargeeddysimulation
_version_	1718404708350033920

Numerical analysis of indirect noise generated by compositional inhomogeneities using large eddy simulation

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