Invariants of velocity gradient tensor in supersonic turbulent pipe, nozzle, and diffuser flows
Velocity gradient tensor (VGT) analysis of high-order accurate direct numerical simulation data of supersonic pipe, nozzle, and diffuser flows at computationally moderate Reynolds numbers is performed. Joint probability density functions of second and third invariants of the VGT conditioned on posit...
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| Veröffentlicht in: | Physics of fluids (1994) 2018-01, Vol.30 (1) |
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| container_title | Physics of fluids (1994) |
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| creator | Kumari, Komal Mahapatra, Susila Ghosh, Somnath Mathew, Joseph |
| description | Velocity gradient tensor (VGT) analysis of high-order accurate direct numerical simulation data of supersonic pipe, nozzle, and diffuser flows at computationally moderate Reynolds numbers is performed. Joint probability density functions of second and third invariants of the VGT conditioned on positive and negative dilatation levels are presented in the near-wall viscous layer, buffer layer, log layer, and core region of these flows. For flow regions with positive dilatation, there is a preference for unstable flow topologies, while regions with negative dilatation show a preference for stable flow topologies. |
| doi_str_mv | 10.1063/1.5004468 |
| format | Article |
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Joint probability density functions of second and third invariants of the VGT conditioned on positive and negative dilatation levels are presented in the near-wall viscous layer, buffer layer, log layer, and core region of these flows. For flow regions with positive dilatation, there is a preference for unstable flow topologies, while regions with negative dilatation show a preference for stable flow topologies.</description><identifier>ISSN: 1070-6631</identifier><identifier>EISSN: 1089-7666</identifier><identifier>DOI: 10.1063/1.5004468</identifier><identifier>CODEN: PHFLE6</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Buffer layers ; Computational fluid dynamics ; Computer simulation ; Conditioning ; Diffusers ; Direct numerical simulation ; Fluid dynamics ; Invariants ; Nozzles ; Physics ; Pipes ; Probability density functions ; Stretching ; Topology ; Velocity gradient</subject><ispartof>Physics of fluids (1994), 2018-01, Vol.30 (1)</ispartof><rights>Author(s)</rights><rights>2018 Author(s). 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For flow regions with positive dilatation, there is a preference for unstable flow topologies, while regions with negative dilatation show a preference for stable flow topologies.</description><subject>Buffer layers</subject><subject>Computational fluid dynamics</subject><subject>Computer simulation</subject><subject>Conditioning</subject><subject>Diffusers</subject><subject>Direct numerical simulation</subject><subject>Fluid dynamics</subject><subject>Invariants</subject><subject>Nozzles</subject><subject>Physics</subject><subject>Pipes</subject><subject>Probability density functions</subject><subject>Stretching</subject><subject>Topology</subject><subject>Velocity gradient</subject><issn>1070-6631</issn><issn>1089-7666</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9kEtLAzEUhYMoWKsL_0HAleLUJDPJzCxFfBQKbroPeUrKmIxJptL-elPatatzL_fjXM4B4BajBUasfsILilDTsO4MzDDq-qpljJ0f5hZVjNX4ElyltEEI1T1hM8CXfiuiEz4nGCzcmiEol3fwKwrtjM8wG59ChM7DNI0mpuCdgnmKchoO59GN5hH6sN8PRYXXUDtrp2QitEP4TdfgwoohmZuTzsH67XX98lGtPt-XL8-rSpGe5MpIgSzGijVUEUr7TlHKSgzat6ZFZe2kRLaxtsa1JNTKliihdd9IrVHd1nNwd7QdY_iZTMp8E6boy0dOMKZdsSCkUPdHSsWQUjSWj9F9i7jjGPFDfRzzU32FfTiyqfQhsgv-H_gPUtFwJg</recordid><startdate>201801</startdate><enddate>201801</enddate><creator>Kumari, Komal</creator><creator>Mahapatra, Susila</creator><creator>Ghosh, Somnath</creator><creator>Mathew, Joseph</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-0887-9641</orcidid></search><sort><creationdate>201801</creationdate><title>Invariants of velocity gradient tensor in supersonic turbulent pipe, nozzle, and diffuser flows</title><author>Kumari, Komal ; Mahapatra, Susila ; Ghosh, Somnath ; Mathew, Joseph</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c292t-eba0f11c645c25598c556446597e7098c8bb0f4ff313b25fb72cadd94bdd0373</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Buffer layers</topic><topic>Computational fluid dynamics</topic><topic>Computer simulation</topic><topic>Conditioning</topic><topic>Diffusers</topic><topic>Direct numerical simulation</topic><topic>Fluid dynamics</topic><topic>Invariants</topic><topic>Nozzles</topic><topic>Physics</topic><topic>Pipes</topic><topic>Probability density functions</topic><topic>Stretching</topic><topic>Topology</topic><topic>Velocity gradient</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kumari, Komal</creatorcontrib><creatorcontrib>Mahapatra, Susila</creatorcontrib><creatorcontrib>Ghosh, Somnath</creatorcontrib><creatorcontrib>Mathew, Joseph</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physics of fluids (1994)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kumari, Komal</au><au>Mahapatra, Susila</au><au>Ghosh, Somnath</au><au>Mathew, Joseph</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Invariants of velocity gradient tensor in supersonic turbulent pipe, nozzle, and diffuser flows</atitle><jtitle>Physics of fluids (1994)</jtitle><date>2018-01</date><risdate>2018</risdate><volume>30</volume><issue>1</issue><issn>1070-6631</issn><eissn>1089-7666</eissn><coden>PHFLE6</coden><abstract>Velocity gradient tensor (VGT) analysis of high-order accurate direct numerical simulation data of supersonic pipe, nozzle, and diffuser flows at computationally moderate Reynolds numbers is performed. Joint probability density functions of second and third invariants of the VGT conditioned on positive and negative dilatation levels are presented in the near-wall viscous layer, buffer layer, log layer, and core region of these flows. For flow regions with positive dilatation, there is a preference for unstable flow topologies, while regions with negative dilatation show a preference for stable flow topologies.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.5004468</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-0887-9641</orcidid></addata></record> |
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| ispartof | Physics of fluids (1994), 2018-01, Vol.30 (1) |
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| language | eng |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Buffer layers Computational fluid dynamics Computer simulation Conditioning Diffusers Direct numerical simulation Fluid dynamics Invariants Nozzles Physics Pipes Probability density functions Stretching Topology Velocity gradient |
| title | Invariants of velocity gradient tensor in supersonic turbulent pipe, nozzle, and diffuser flows |
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