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  • Aerodynamics; Computer Programming and Software  (1)
  • Condensed Matter: Structure, etc.  (1)
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  • 1
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    Complex Low Energy Tetrahedral Polymorphs of Group IV Elements from First Principles (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-10-27
    Description: Author(s): Chaoyu He, Xizhi Shi, S. J. Clark, Jin Li, Chris J. Pickard, Tao Ouyang, Chunxiao Zhang, Chao Tang, and Jianxin Zhong The energy landscape of carbon is exceedingly complex, hosting diverse and important metastable phases, including diamond, fullerenes, nanotubes, and graphene. Searching for structures, especially those with large unit cells, in this landscape is challenging. Here we use a combined stochastic search... [Phys. Rev. Lett. 121, 175701] Published Fri Oct 26, 2018
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Direct Numerical Simulation Database for Hypersonic Turbulent Boundary Layers (2018)
    In:  CASI
    Details
    Publication Date: 2019-11-16
    Description: This paper presents a direct numerical simulation database of high-speed zero-pressure-gradient turbulent boundary layers developing spatially over a flat plate with nominal freestream Mach number ranging from 2.5 to 14 and wall-to-recovery temperature ranging from 0.18 to 1.0. The flow conditions of the DNS are representative of the operational conditions of the Purdue Mach 6 quiet tunnel, the Sandia Hypersonic Wind Tunnel at Mach 8, and the AEDC Hypervelocity Tunnel No. 9 at Mach 14. The DNS database is used to gauge the performance of compressibility transformations, including the classical Morkovins scaling and strong Reynolds analogy as well as the newly proposed mean velocity and temperature scalings that explicitly account for wall heat flux. Several insights into the effect of direct compressibility are gained by inspecting the thermodynamic fluctuations and the Reynolds stress budget terms. Precomputed flow statistics, including Reynolds stresses and their budgets, will be available at the website of the NASA Langley Turbulence Modeling Resource, allowing other investigators to query any property of interest.
    Keywords: Aerodynamics; Computer Programming and Software
    Type: NF1676L-29540 , AIAA Journal (ISSN 0001-1452) (e-ISSN 1533-385X); 56; 11; 4297-4311
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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