Aeroacoustic study on roof bow. CFD generation of input data for hybrid approach.

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dc.contributor.authorTell, Johan
dc.contributor.departmentChalmers tekniska högskola / Institutionen för tillämpad mekaniksv
dc.contributor.departmentChalmers University of Technology / Department of Applied Mechanicsen
dc.date.accessioned2019-07-03T13:04:49Z
dc.date.available2019-07-03T13:04:49Z
dc.date.issued2012
dc.description.abstractAeroacoustics means noise induced by ow, which is a growing field of interest in todays automotive industry. This study was carried out at Volvo Group Trucks Technology with the purpose to learn about the aeroacoustics around a roof bow in combination with cavities as well as looking into methodologies. This Master's thesis is focused on the first part of a two step hybrid approach for noise simulation, meaning to simulate the ow using computational uid dynamics (CFD). Both stationary and transient simulations with aeroacoustic treatment were performed. Different turbulence models such as large eddy simulations (LES), detached eddy simulations (DES) and unsteady Reynolds averaged Navier Stokes (URANS) were tested. Acoustic sources were looked upon with help of acoustical analogies such as Curle and Proudman, both derived from Lighthill's analogies. It was realized that the bow studied introduces broad banded noise, which could be related to its shedding frequency. Also the cavities seemed to produce broad banded noise, particularly at higher frequencies. The results reveals that LES is costly and requires approximately twice the computation time of DES and a considerably denser mesh.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/172746
dc.language.isoeng
dc.relation.ispartofseriesDiploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden : 2012:56
dc.setspec.uppsokTechnology
dc.subjectGrundläggande vetenskaper
dc.subjectAkustik
dc.subjectTransport
dc.subjectBasic Sciences
dc.subjectAcoustics
dc.subjectTransport
dc.titleAeroacoustic study on roof bow. CFD generation of input data for hybrid approach.
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeSound and vibration (MPSOV), MSc
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