Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Global transient-growth analysis of hypersonic flow on the hifire-5 elliptic cone model
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-5913-5431
2019 (English)In: AIAA Scitech 2019 Forum, American Institute of Aeronautics and Astronautics Inc, AIAA , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Linear global non-modal instability analysis of the boundary layer over the Hypersonic International Flight Research Experimentation 5 (HIFiRE-5) rounded-tip 2:1 elliptic cone model is performed on a plane normal to the cone symmetry axis. The base flow has been computed using the US3D solver at Ma=7 and flight altitude of 33km and has been analyzed with respect to its modal instability in earlier work. The present objective is to interrogate the same flow regarding the existence of optimal transiently growing small-amplitude disturbances and correlate the latter with exponentially-growing modal instability mechanisms that have been confirmed to exist in this flow. Perturbation energy growth is calculated here using Singular Value Decomposition (SVD) of the linearized Navies-Stokes evolution operator: local transient growth analysis is performed by linearizing about an one-dimensional profile extracted from the base flow, while global non-modal analysis is performed by performing the SVD of the operator linearized about the full two-dimensional steady state on the plane. In both cases linear optimal perturbations are computed; local results are consistent with those of earlier analysis of the compressible flat-plate boundary layer, while global transient growth analysis results obtained herein reveal both symmetric and antisymmetric global modes emerging out of the temporal integration of the linearized operator in the limit of asymptotically large times. This scenario of emergence of modal perturbations in a non-modal analysis, in which no explicit assumption of harmonic time-dependence of linear perturbations has been made, is consistent with analogous findings in a number of incompressible flows and reconciles earlier modal and non-modal linear instability analysis results obtained on the HIFiRE-5 model configuration. � 2019 by German Aerospace Center (DLR). Published by the American Institute of Aeronautics and Astronautics, Inc.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics Inc, AIAA , 2019.
Keywords [en]
Aerodynamics, Aviation, Hypersonic boundary layers, Hypersonic flow, Incompressible flow, Linearization, Singular value decomposition, Stability, Transient analysis, Warships, American Institute of Aeronautics and Astronautics, Flat plate boundary layers, German aerospace centers, Harmonic time dependence, International flights, Linear instability analysis, Linear perturbations, Temporal integration, Modal analysis
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-262461DOI: 10.2514/6.2019-2148Scopus ID: 2-s2.0-85068893493ISBN: 9781624105784 (print)OAI: oai:DiVA.org:kth-262461DiVA, id: diva2:1362341
Conference
AIAA Scitech Forum, 7-11 January 2019, San Diego, California
Note

QC 20191018

Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-10-18Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopusMeeting Paper Home AIAA Scitech 2019 Forum

Authority records BETA

Hanifi, Ardeshir

Search in DiVA

By author/editor
Hanifi, Ardeshir
By organisation
MechanicsLinné Flow Center, FLOW
Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
isbn
urn-nbn

Altmetric score

doi
isbn
urn-nbn
Total: 46 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf