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Simulation of high speed flows

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Title
Simulation of high speed flows
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Kianvashrad
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Nadia
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Kianvashrad, Nadia
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author
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Prosenjit Bagchi
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Advisory Committee
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internal member
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Shan
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Jerry
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Jerry Shan
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Yan
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Hong
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Hong Yan
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Advisory Committee
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outside member
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Rutgers University
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degree grantor
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School of Graduate Studies
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theses
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2020
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2020-05
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English
Abstract (type = abstract)
There is a reinterest in hypersonic flow. There are several programs all around the world to produce hypersonic aircraft. Computational fluid dynamics (CFD) is an essential tool for high speed aerodynamics. However, it is still under investigation that how reliable is this tool especially at high stagnation enthalpies at high speed flows where non-equilibrium effects are important. For assessment of the CFD capability in the prediction of the aerothermodynamic loading (surface pressure and surface heat transfer) on a hypersonic vehicle, three sample experiments are examined in this dissertation. The models include a hollow cylinder flare, a double cone, and a hemisphere at Mach number range of 10.9 to 14.6. The laminar shock wave boundary layer interaction is investigated at high enthalpy ranges of 9.65 to 21.85 MJ/kg. It is shown that the formation of a supersonic jet as a result of the interaction of the shock waves prevented the highly dissociated gas to reach to the surface and thus the thermally perfect gas model has the best prediction of surface pressure and heat transfer. For hollow cylinder flare, the shock wave boundary layer interaction is weak and therefore, the effect of non-equilibrium modeling is negligible.

The Edney III type shock-shock interaction is studied over a hemisphere at low enthalpy of 2.1 MJ/kg. Edney III interaction can create a region of high pressure and heat transfer over the surface. Therefore, accurate prediction of this phenomenon is essential. The study in this dissertation shows that the interaction is very sensitive to the location of the interaction of the impinging shock and the bow shock. This can change even the flow regime from laminar to turbulent.

Another challenge facing scientists in producing a hypersonic vehicle is how to rapidly maneuver the vehicle. The common controlling methods are too slow and during their actuation time, the vehicle moves several times its length. One option is to use energy discharge to change the flow structure around the body. This changes the pressure distribution over the body which can create pitching moments for steering the vehicle. Drag reduction is also another benefit that can achieve from energy deposition. If the energy discharge is on the axis of symmetry of the body, only drag reduction is acquired; however, off axis energy discharge provides drag reduction, side force and thus pitching moment. This dissertation has shown that the drag reduction and pitching moment depend on the amount of energy deposited, the location of the discharge, and the shape of the body.
Subject (authority = local)
Topic
High speed flow
Subject (authority = RUETD)
Topic
Mechanical and Aerospace Engineering
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Rutgers University Electronic Theses and Dissertations
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ETD_10736
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application/pdf
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Extent
1 online resource (xix, 201 pages)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
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School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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Identifier (type = doi)
doi:10.7282/t3-b3q3-3g45
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

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The author owns the copyright to this work.
RightsHolder (type = personal)
Name
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Kianvashrad
GivenName
Nadia
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Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2020-04-14 14:32:39
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Name
Nadia Kianvashrad
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Affiliation
Rutgers University. School of Graduate Studies
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Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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Type
Embargo
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2020-05-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2020-11-30
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after November 30th, 2020.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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