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dc.contributor.authorSoni, Vineet
dc.contributor.authorChaudhuri, Arnab
dc.contributor.authorBrahmi, Nassim
dc.contributor.authorHadjadj, Abdellah
dc.date.accessioned2019-09-06T09:53:33Z
dc.date.accessioned2019-09-25T08:40:18Z
dc.date.available2019-09-06T09:53:33Z
dc.date.available2019-09-25T08:40:18Z
dc.date.issued2019-07
dc.identifier.citationSoni V, Chaudhuri A, Brahmi, Hadjadj A. Turbulent structures of shock-wave diffraction over 90° convex corner. Physics of fluids. 2019;31(8)en
dc.identifier.issn1070-6631
dc.identifier.urihttps://hdl.handle.net/10642/7570
dc.description.abstractThe turbulent structures and long-time flow dynamics of shock diffraction over 90° convex corner associated with an incident shock Mach number Ms = 1.5 are investigated by large eddy simulation (LES). The average evolution of the core of the primary vortex is in agreement with the previous two dimensional studies. The Type-N wall shock structure is found to be in excellent agreement with the previous experimental data. The turbulent structures are well resolved and resemble those observed in the experimental findings. Subgrid scale dissipation and subgrid scale activity parameter are quantified to demonstrate the effectiveness of the LES. An analysis based on turbulent-nonturbulent interface reveals that locally incompressible regions exhibit the universal teardrop shape of the joint probability density function of the second and third invariants of the velocity gradient tensor. Stable focus stretching (SFS) structures dominate throughout the evolution in these regions. Stable node/saddle/saddle structures are found to be predominant at the early stage in locally compressed regions, and the flow structures evolve to more SFS structures at later stages. On the other hand, the locally expanded regions show a mostly unstable nature. From the turbulent kinetic energy, we found that the pressure dilatation remains important at the early stage, while turbulent diffusion becomes important at the later stage. Furthermore, the analysis of the resolved vorticity transport equation reveals that the stretching of vorticity due to compressibility and stretching of vorticity due to velocity gradients plays an important role compared to diffusion of vorticity due to viscosity as well as the baroclinic term.en
dc.description.sponsorshipThis study was supported by the BIOENGINE project, which is funded by the European Regional Development Fund (ERDF) and the Regional Council of Normandie under Contract No. HN-0002484.en
dc.language.isoenen
dc.publisherAIP Publishingen
dc.relation.ispartofseriesPhysics of Fluids;Volume 31, Issue 8
dc.rightsAuthor can archive post-print (ie final draft post-refereeing).en
dc.subjectShock wave diffractionsen
dc.subjectLarge Eddy Simulationen
dc.subjectFlow topologyen
dc.subjectTurbulent kinetic energyen
dc.subjectVorticity transport equations
dc.titleTurbulent structures of shock-wave diffraction over 90° convex corneren
dc.typeJournal articleen
dc.typePeer revieweden
dc.date.updated2019-09-06T09:53:33Z
dc.description.versionacceptedVersionen
dc.identifier.doihttps://dx.doi.org/10.1063/1.5113976
dc.identifier.cristinID1722246
dc.source.issn1070-6631
dc.source.issn1089-7666
dc.relation.journalPhysics of fluids


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