Numerical computations of steady and unsteady flow in bended pipes
(2007) 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:
https://lup.lub.lu.se/record/571927
- author
- Hellström, Fredrik and Fuchs, Laszlo LU
- organization
- publishing date
- 2007
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- 37th AIAA Fluid Dynamics Conference and Exhibit
- publisher
- American Institute of Aeronautics and Astronautics
- conference name
- 37th AIAA Fluid Dynamics Conference and Exhibit
- conference location
- United States
- conference dates
- 2007-06-25 - 2007-06-28
- 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
- 2016-04-04 11:46:39
- date last changed
- 2022-01-29 22:25:43
@inproceedings{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}},
booktitle = {{37th AIAA Fluid Dynamics Conference and Exhibit}},
language = {{eng}},
publisher = {{American Institute of Aeronautics and Astronautics}},
title = {{Numerical computations of steady and unsteady flow in bended pipes}},
year = {{2007}},
}