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  • Aerodynamics  (3)
  • Polymers  (3)
  • General relativity, alternative theories of gravity  (2)
  • 2015-2019  (8)
  • 1
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    Efficient simulation of semiflexible polymers (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-09-30
    Description: Author(s): Debabrata Panja, Gerard T. Barkema, and J. M. J. van Leeuwen Using a recently developed bead-spring model for semiflexible polymers that takes into account their natural extensibility, we report an efficient algorithm to simulate the dynamics for polymers like double-stranded DNA (dsDNA) in the absence of hydrodynamic interactions. The dsDNA is modeled with o… [Phys. Rev. E 92, 032603] Published Tue Sep 29, 2015
    Keywords: Polymers
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Astrometric effects of gravitational wave backgrounds with non-Einsteinian polarizations (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-06-23
    Description: Author(s): Deyan P. Mihaylov, Christopher J. Moore, Jonathan R. Gair, Anthony Lasenby, and Gerard Gilmore The Gaia mission offers a new opportunity to search for the low-frequency gravitational wave background using astrometric measurements. In this paper, the astrometric effect of gravitational waves is reviewed, with a particular focus on the effect of non-Einsteinian gravitational wave polarizations.... [Phys. Rev. D 97, 124058] Published Fri Jun 22, 2018
    Keywords: General relativity, alternative theories of gravity
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Dynamics of a double-stranded DNA segment in a shear flow (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-04-09
    Description: Author(s): Debabrata Panja, Gerard T. Barkema, and J. M. J. van Leeuwen We study the dynamics of a double-stranded DNA (dsDNA) segment, as a semiflexible polymer, in a shear flow, the strength of which is customarily expressed in terms of the dimensionless Weissenberg number Wi. Polymer chains in shear flows are well known to undergo tumbling motion. When the chain leng… [Phys. Rev. E 93, 042501] Published Thu Apr 07, 2016
    Keywords: Polymers
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Rotating magnetized black diholes (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-11-06
    Description: Author(s): Gérard Clément We analyze a four-parameter class of asymptotically flat magnetized solutions to the Einstein-Maxwell equations constructed by Manko et al. and show that these represent systems of two corotating extreme black holes with equal masses and electric charges, and opposite magnetic and NUT charges, conne... [Phys. Rev. D 98, 104003] Published Mon Nov 05, 2018
    Keywords: General relativity, alternative theories of gravity
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Efficient simulation of semiflexible polymers with stiff bonds (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-01-12
    Description: Author(s): Gerard T. Barkema and J. M. J. van Leeuwen We investigate the simulation of stiff (extensible) and rigid (inextensible) semiflexible polymers in solution. In particular, we focus on polymers represented as chains of beads, interconnected by bonds with a low to zero extensibility, and significant persistence in the bond orientations along the… [Phys. Rev. E 95, 012502] Published Fri Jan 06, 2017
    Keywords: Polymers
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Complementary Aerodynamic Performance Datasets for Variable Speed Power Turbine Blade Section from Two Independent Transonic Turbine Cascades (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two independent experimental studies were conducted in linear cascades on a scaled, two-dimensional mid-span section of a representative Variable Speed Power Turbine (VSPT) blade. The purpose of these studies was to assess the aerodynamic performance of the VSPT blade over large Reynolds number and incidence angle ranges. The influence of inlet turbulence intensity was also investigated. The tests were carried out in the NASA Glenn Research Center Transonic Turbine Blade Cascade Facility and at the University of North Dakota (UND) High Speed Compressible Flow Wind Tunnel Facility. A large database was developed by acquiring total pressure and exit angle surveys and blade loading data for ten incidence angles ranging from +15.8deg to 51.0deg. Data were acquired over six flow conditions with exit isentropic Reynolds number ranging from 0.05106 to 2.12106 and at exit Mach numbers of 0.72 (design) and 0.35. Flow conditions were examined within the respective facility constraints. The survey data were integrated to determine average exit total-pressure and flow angle. UND also acquired blade surface heat transfer data at two flow conditions across the entire incidence angle range aimed at quantifying transitional flow behavior on the blade. Comparisons of the aerodynamic datasets were made for three "match point" conditions. The blade loading data at the match point conditions show good agreement between the facilities. This report shows comparisons of other data and highlights the unique contributions of the two facilities. The datasets are being used to advance understanding of the aerodynamic challenges associated with maintaining efficient power turbine operation over a wide shaft-speed range.
    Keywords: Aerodynamics
    Type: GRC-E-DAA-TN27685 , ISABE Conference; Oct 25, 2015 - Oct 30, 2015; Phoenix, AZ; United States
    Format: application/pdf
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  • 7
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    Complementary Aerodynamic Performance Datasets for Variable Speed Power Turbine Blade Section from Two Independent Transonic Turbine Cascades (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two independent experimental studies were conducted in linear cascades on a scaled, two-dimensional mid-span section of a representative Variable Speed Power Turbine (VSPT) blade. The purpose of these studies was to assess the aerodynamic performance of the VSPT blade over large Reynolds number and incidence angle ranges. The influence of inlet turbulence intensity was also investigated. The tests were carried out in the NASA Glenn Research Center Transonic Turbine Blade Cascade Facility and at the University of North Dakota (UND) High Speed Compressible Flow Wind Tunnel Facility. A large database was developed by acquiring total pressure and exit angle surveys and blade loading data for ten incidence angles ranging from +15.8deg to 51.0deg. Data were acquired over six flow conditions with exit isentropic Reynolds number ranging from 0.05106 to 2.12106 and at exit Mach numbers of 0.72 (design) and 0.35. Flow conditions were examined within the respective facility constraints. The survey data were integrated to determine average exit total-pressure and flow angle. UND also acquired blade surface heat transfer data at two flow conditions across the entire incidence angle range aimed at quantifying transitional flow behavior on the blade. Comparisons of the aerodynamic datasets were made for three "match point" conditions. The blade loading data at the match point conditions show good agreement between the facilities. This report shows comparisons of other data and highlights the unique contributions of the two facilities. The datasets are being used to advance understanding of the aerodynamic challenges associated with maintaining efficient power turbine operation over a wide shaft-speed range.
    Keywords: Aerodynamics
    Type: ISABE 2015-20163 , GRC-E-DAA-TN23722 , International Symposium on Air Breathing Engines (ISABE 2015); Oct 25, 2015 - Oct 30, 2015; Phoenix, AZ; United States
    Format: application/pdf
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  • 8
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    Aerodynamic Performance of a Compact, High Work-Factor Centrifugal Compressor at the Stage and Subcomponent Level (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The measured aerodynamic performance of a compact, high work-factor, single-stage centrifugal compressor, comprising an impeller, diffuser, 90deg-bend, and exit guide vane is reported. Performance levels are based on steady-state total-pressure and total-temperature rake and angularity-probe data acquired at key machine rating planes during recent testing at NASA Glenn Research Center. Aerodynamic performance at the stage level is reported for operation between 70 to 105 percent of design corrected speed, with subcomponent (impeller, diffuser, and exit-guide-vane) flow field measurements presented and discussed at the 100 percent design-speed condition. Individual component losses from measurements are compared with pre-test CFD predictions on a limited basis.
    Keywords: Aerodynamics
    Type: NASA/TM-2015-218455 , AIAA Paper 2014-3632 , E-19013 , GRC-E-DAA-TN17236 , Joint Propulsion Conference; Jul 28, 2014 - Jul 30, 2014; Cleveland, OH; United States
    Format: application/pdf
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