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Implementering av akustiska analogier i Openfoam och CALFEM/Matlab

Nilsson, Johan LU (2010) In TVBA VTA820 20101
Engineering Physics (M.Sc.Eng.)
Engineering Acoustics
Abstract
Aeroacoustics is the field that studies flow induced sound. The source of sound can for example be fans, duct flows, aircraft propellers and objects mounted on the outside of a vehicle. The most often used computational methods for aeroacoustics are based on acoustical analogies.

The software package CALFEM is a finite element toolbox developed for teaching at Lund University. It contains routines to solve acoustical problems. OpenFOAM is an open source CFD code. In this master thesis it is investigated how a method using the acoustical analogies can be implemented with OpenFOAM and CALFEM.

The method was implemented as follows. First, an incompressible flow carried out using OpenFOAM which provides the acoustic sources. Then the source... (More)
Aeroacoustics is the field that studies flow induced sound. The source of sound can for example be fans, duct flows, aircraft propellers and objects mounted on the outside of a vehicle. The most often used computational methods for aeroacoustics are based on acoustical analogies.

The software package CALFEM is a finite element toolbox developed for teaching at Lund University. It contains routines to solve acoustical problems. OpenFOAM is an open source CFD code. In this master thesis it is investigated how a method using the acoustical analogies can be implemented with OpenFOAM and CALFEM.

The method was implemented as follows. First, an incompressible flow carried out using OpenFOAM which provides the acoustic sources. Then the source terms are interpolated and converted for use in CALFEM. This was done by adding code to OpenFOAM, writing conversion programs and writing a CALFEM case.

Finally the implemented method was tested on an open cavity. Since it was difficult to find relevant experimental measurements, the method could not be properly validated yet. (Less)
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author
Nilsson, Johan LU
supervisor
organization
course
VTA820 20101
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
TVBA
report number
TVBA-5040
ISSN
0281-8477
language
Swedish
id
3806156
date added to LUP
2013-08-01 14:03:12
date last changed
2013-10-03 17:37:47
@misc{3806156,
  abstract     = {Aeroacoustics is the field that studies flow induced sound. The source of sound can for example be fans, duct flows, aircraft propellers and objects mounted on the outside of a vehicle. The most often used computational methods for aeroacoustics are based on acoustical analogies.

The software package CALFEM is a finite element toolbox developed for teaching at Lund University. It contains routines to solve acoustical problems. OpenFOAM is an open source CFD code. In this master thesis it is investigated how a method using the acoustical analogies can be implemented with OpenFOAM and CALFEM.

The method was implemented as follows. First, an incompressible flow carried out using OpenFOAM which provides the acoustic sources. Then the source terms are interpolated and converted for use in CALFEM. This was done by adding code to OpenFOAM, writing conversion programs and writing a CALFEM case.

Finally the implemented method was tested on an open cavity. Since it was difficult to find relevant experimental measurements, the method could not be properly validated yet.},
  author       = {Nilsson, Johan},
  issn         = {0281-8477},
  language     = {swe},
  note         = {Student Paper},
  series       = {TVBA},
  title        = {Implementering av akustiska analogier i Openfoam och CALFEM/Matlab},
  year         = {2010},
}