dc.contributor.advisor | Pettersen, Bjørnar | |
dc.contributor.advisor | Andersson, Helge I. | |
dc.contributor.author | Strandenes, Håkon | |
dc.date.accessioned | 2019-05-07T12:55:08Z | |
dc.date.available | 2019-05-07T12:55:08Z | |
dc.date.issued | 2019 | |
dc.identifier.isbn | 978-82-326-3709-6 | |
dc.identifier.issn | 1503-8181 | |
dc.identifier.uri | http://hdl.handle.net/11250/2596831 | |
dc.description.abstract | This thesis presents recent advancements in direct numerical simulations of bluff body wake flows. The flow around a circular cylinder without and with special fairings have been studied, and the effect of boundary conditions compared with what is used in physical experiments.
The flow around a 45 inclined 6:1 prolate spheroid have been studied for a broad range of Reynolds numbers ranging from 4000 to 16 000 based on the minor diameter of the spheroid. During this range of Reynolds numbers there is a transition from a steady, symmetric, laminar flow to a highly turbulent and asymmetric flow. Several interesting flow phenomena have been investigated in details.
In addition to the flow investigations the present thesis present developments in simulation tools and mesh design which were neccesary in order to conduct the largest simulations in this thesis, that is the inclined prolate spheroid at Reynolds number 16000. The grid used contained around 8.4 billion (109) grid cells. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | NTNU | nb_NO |
dc.relation.ispartofseries | Doctoral theses at NTNU;2019:52 | |
dc.relation.haspart | Paper 1: Strandenes, Håkon; Canabes, José Patricio Gallardo; Pettersen, Bjørnar; Andersson, Helge Ingolf. On the Effect of Boundary Conditions on the Flow around a Cylinder in a Channel. I: Proceedings of MekIT'15 Eighth National Conference on Computational Mechanics. International Center for Numerical Methods in Engineering (CIMNE) 2015 ISBN 97884944244-96. s. 343-357 | nb_NO |
dc.relation.haspart | Paper 2: Strandenes, Håkon; Pettersen, Bjørnar; Andersson, Helge Ingolf; Manhart, Michael. Influence of spanwise no-slip boundary conditions on the flow around a cylinder. Computers & Fluids 2017 ;Volum 156. s. 48-57 | nb_NO |
dc.relation.haspart | Paper 3: Efficient and adaptive Cartesian mesh generation and flow initialization for DNS, Håkon Strandenes, Fengjian Jiang, Florian Schwertfirm, Bjørnar Pettersen, Helge I. Andersson
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This article is awaiting publication and is not included in NTNU Open | nb_NO |
dc.relation.haspart | Paper 4: Strandenes, Håkon; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf. Near-Wake of an Inclined 6:1 Spheroid at Reynolds Number 4000. AIAA Journal 2019 s. 1-9
https://doi.org/10.2514/1.J057615 | nb_NO |
dc.relation.haspart | Paper 5: Low-Frequent Oscillations in Flow past an Inclined Prolate Spheroid, Håkon Strandenes, Fengjian Jiang, Bjørnar Pettersen, Helge I. Andersson.
Accepted for publication.
This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | nb_NO |
dc.title | Turbulent flow simulations at higher Reynolds numbers | nb_NO |
dc.title.alternative | Turbulent flow simulations at higher Reynolds numbers | nb_NO |
dc.type | Doctoral thesis | nb_NO |
dc.subject.nsi | VDP::Technology: 500::Marine technology: 580 | nb_NO |