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Numerical computations of steady and unsteady flow in bended pipes

Hellström, Fredrik and Fuchs, Laszlo LU (2007) 37th AIAA Fluid Dynamics Conference and Exhibit In 37th AIAA Fluid Dynamics Conference and Exhibit
Abstract
The steady and pulsative turbulent flows in curved pipes have been computed with two

different modeling approaches; the Reynolds Averaged Navier-Stokes (RANS) technique

and Large Eddy Simulations (LES). The results from computations of the flow in a single

bended pipe have been compared to experimental data. The comparisons show poor

agreement for the RANS technique at the exit of the bend, while the LES computations

show better agreement with the measured velocity profiles. LES in contrast to RANS,

can also provide much more details about the dynamics of the flow. It is also shown that

small uncertainties in the inlet boundary conditions can result in significant variations... (More)
The steady and pulsative turbulent flows in curved pipes have been computed with two

different modeling approaches; the Reynolds Averaged Navier-Stokes (RANS) technique

and Large Eddy Simulations (LES). The results from computations of the flow in a single

bended pipe have been compared to experimental data. The comparisons show poor

agreement for the RANS technique at the exit of the bend, while the LES computations

show better agreement with the measured velocity profiles. LES in contrast to RANS,

can also provide much more details about the dynamics of the flow. It is also shown that

small uncertainties in the inlet boundary conditions can result in significant variations in

the flow field. Different types of small amplitude secondary flow at the inlet affect the

flow downstream of the bend. The approach enables one to state that for the experiments

under consideration the lack of data on the secondary flow prevents a direct validation of

the LES results. The pulsatile flow in a double bended pipe has also been investigated and

the vortex cores are visualized to enable a better insight into the unsteady flow field and

the effects of the inflow pulsations. (Less)
Please use this url to cite or link to this publication:
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type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
37th AIAA Fluid Dynamics Conference and Exhibit
publisher
American Institute of Aeronautics and Astronautics
conference name
37th AIAA Fluid Dynamics Conference and Exhibit
external identifiers
  • Other:AIAA 2007-4350
  • Scopus:35649003022
language
English
LU publication?
yes
id
1b733a53-539f-4803-bc2e-c6e29cf798bd (old id 571927)
date added to LUP
2008-02-27 10:52:36
date last changed
2016-10-13 04:47:47
@misc{1b733a53-539f-4803-bc2e-c6e29cf798bd,
  abstract     = {The steady and pulsative turbulent flows in curved pipes have been computed with two<br/><br>
different modeling approaches; the Reynolds Averaged Navier-Stokes (RANS) technique<br/><br>
and Large Eddy Simulations (LES). The results from computations of the flow in a single<br/><br>
bended pipe have been compared to experimental data. The comparisons show poor<br/><br>
agreement for the RANS technique at the exit of the bend, while the LES computations<br/><br>
show better agreement with the measured velocity profiles. LES in contrast to RANS,<br/><br>
can also provide much more details about the dynamics of the flow. It is also shown that<br/><br>
small uncertainties in the inlet boundary conditions can result in significant variations in<br/><br>
the flow field. Different types of small amplitude secondary flow at the inlet affect the<br/><br>
flow downstream of the bend. The approach enables one to state that for the experiments<br/><br>
under consideration the lack of data on the secondary flow prevents a direct validation of<br/><br>
the LES results. The pulsatile flow in a double bended pipe has also been investigated and<br/><br>
the vortex cores are visualized to enable a better insight into the unsteady flow field and<br/><br>
the effects of the inflow pulsations.},
  author       = {Hellström, Fredrik and Fuchs, Laszlo},
  language     = {eng},
  publisher    = {ARRAY(0x9b5a550)},
  series       = {37th AIAA Fluid Dynamics Conference and Exhibit},
  title        = {Numerical computations of steady and unsteady flow in bended pipes},
  year         = {2007},
}