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Study of Junctions in 1-D & 3-D Simulation for Steady and Unsteady Flow
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). KTH, School of Industrial Engineering and Management (ITM), Centres, Centre for Internal Cumbustion Engine Research Opus, CICERO (closed 20101231).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes.
2010 (English)In: SAE technical paper series, ISSN 0148-7191, no 01-1050Article in journal (Refereed) Published
Abstract [en]

In this work a comparative study between 1-D and 3-D calculations has been performed on different junctions. The geometries are a 90° T-junction with an area ratio of unity and a 45° junction with an area ratio of 1.78 between the main pipe and the side branch. The latter case had an offset between the centerlines of the main and the branched pipe. The 3-D modeling framework uses the Reynolds Averaged Navier-Stokes (RANS) equations with the k-ε model both for the steady and the unsteady flow cases. The comparison is made both under steady and pulsating flow conditions. The aim has been to assess the 1-D/3-D differences in terms of measures for flow losses.

There are large discrepancies between the 1-D and 3-D computed losses in junctions. The relative differences between 1-D and 3-D computed losses in isentropic power are 63 % and 175 % for the 90° and the 45 ° junctions without including the losses in downstream pipe legs. These figures are reduced to 12 % and 114 % respectively when including a straight pipe segment of one diameter downstream of the junction outlets.

For the 90° junction at pulsating flow, the discrepancy in 1-D and 3-D computed loss is lower compared to the steady flow case if comparing only the losses in the junction, but similar to the steady discrepancy if including the downstream pipe losses. For the 45° junction, the discrepancies are much larger. The 1-D loss is near six times that of the corresponding 3-D value if comparing the losses in the junction alone, and 3 times the 3-D value if including the losses in 10 diameter of the outlet pipe.

Place, publisher, year, edition, pages
Society of Automotive Engineers, 2010. no 01-1050
Keyword [en]
3-d modeling, 3D simulations, Area ratios, Branched pipes, Centerlines, Comparative studies, Flow loss, Isentropic, Pulsating flow, Reynolds-Averaged Navier-Stokes equations, Side branches, Straight pipe, T junctions
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-24682DOI: 10.4271/2010-01-1050Scopus ID: 2-s2.0-84877210948OAI: oai:DiVA.org:kth-24682DiVA: diva2:352687
Note

QC 20100922

Available from: 2010-09-22 Created: 2010-09-22 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Analysis of shortcomings with 1-D engine calculations by means of 3-D computations on components
Open this publication in new window or tab >>Analysis of shortcomings with 1-D engine calculations by means of 3-D computations on components
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2010. p. 126
Series
Trita-MMK, ISSN 1400-1179 ; 2010:02
Identifiers
urn:nbn:se:kth:diva-13095 (URN)978-91-7415-613-3 (ISBN)
Public defence
2010-05-26, Sal M3, Brinellvägen 64, KTH, Stockholm, 11:30 (English)
Opponent
Supervisors
Note
QC 20100922Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-09-22Bibliographically approved

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Renberg, UlricaWestin, FredrikÅngström, Hans-ErikFuchs, Laszlo
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