Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies

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dc.contributor.advisorChinyoka, Tirivanhuen_ZA
dc.contributor.authorNyandeni, Zamashobaneen_ZA
dc.date.accessioned2017-09-26T14:50:08Z
dc.date.available2017-09-26T14:50:08Z
dc.date.issued2017en_ZA
dc.description.abstractThis study considers a numerical approach to identifying noise mechanisms in tandem cylinders to understand aircraft landing gear as a primary contributor to airframe noise during approach and landing. Fluctuations in the flow properties induced by turbulence are computed as well as the corresponding propagations. A hybrid IDDES turbulence model is employed, to compute the boundary layer and fluctuations in the flow properties. Larsson et al. modified Curle's analogy leading to the derivation of a version of Curle's analogy that makes use of strictly time derivatives which has been proven to be less sensitive to numerical errors. Brentner and Farassat derived a formulation of the Ffowcs-Williams and Hawkings analogy for a permeable surface enclosing the acoustic sources which accounts for the quadrupole acoustic sources in the flow without the costly calculation of a volume integral. This study will consider the impact of neglecting the volume sources through a comparison of the two modified versions of Curle's and FWH analogies with the results of other CFD practitioners as well as experimental data.en_ZA
dc.identifier.apacitationNyandeni, Z. (2017). <i>Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/25388en_ZA
dc.identifier.chicagocitationNyandeni, Zamashobane. <i>"Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2017. http://hdl.handle.net/11427/25388en_ZA
dc.identifier.citationNyandeni, Z. 2017. Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Nyandeni, Zamashobane AB - This study considers a numerical approach to identifying noise mechanisms in tandem cylinders to understand aircraft landing gear as a primary contributor to airframe noise during approach and landing. Fluctuations in the flow properties induced by turbulence are computed as well as the corresponding propagations. A hybrid IDDES turbulence model is employed, to compute the boundary layer and fluctuations in the flow properties. Larsson et al. modified Curle's analogy leading to the derivation of a version of Curle's analogy that makes use of strictly time derivatives which has been proven to be less sensitive to numerical errors. Brentner and Farassat derived a formulation of the Ffowcs-Williams and Hawkings analogy for a permeable surface enclosing the acoustic sources which accounts for the quadrupole acoustic sources in the flow without the costly calculation of a volume integral. This study will consider the impact of neglecting the volume sources through a comparison of the two modified versions of Curle's and FWH analogies with the results of other CFD practitioners as well as experimental data. DA - 2017 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2017 T1 - Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies TI - Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies UR - http://hdl.handle.net/11427/25388 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/25388
dc.identifier.vancouvercitationNyandeni Z. Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2017 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/25388en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMathematics and Appplied Mathematicsen_ZA
dc.titleComputational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogiesen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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