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  • 1
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    Retooling CFD for hypersonic aircraft (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The CFD facility requirements of hypersonic aircraft configuration design development are different from those thus far employed for reentry vehicle design, because (1) the airframe and the propulsion system must be fully integrated to achieve the desired performance; (2) the vehicle must be reusable, with minimum refurbishment requirements between flights; and (3) vehicle performance must be optimized for a wide range of Mach numbers. An evaluation is presently made of flow resolution within shock waves, transition and turbulence phenomenon tractability, chemical reaction modeling, and hypersonic boundary layer transition, with state-of-the-art CFD.
    Keywords: AERONAUTICS (GENERAL)
    Type: Aerospace America (ISSN 0740-722X); 25; 32-35
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    NASA TECHNICAL REPORTS
  • 2
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    Yesterday, today and tomorrow: A perspective of CFD at NASA's Ames Research Center (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The opportunity to reflect on the computational fluid dynamics (CFD) progam at the NASA Ames Research Center (its beginning, its present state, and its direction for the future) is afforded. Essential elements of the research program during each period are reviewed, including people, facilities, and research problems. The burgeoning role that CFD is playing in the aerospace business is discussed, as is the necessity for validated CFD tools. The current aeronautical position of this country is assessed, as are revolutionary goals to help maintain its aeronautical supremacy in the world.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Supercomputing in Aerospace; p 49-61
    Format: application/pdf
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  • 3
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    A perspective of computational fluid dynamics (1986)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Computational fluid dynamics (CFD) is maturing, and is at a stage in its technological life cycle where it is now routinely applied to complex problems. It is starting to create an impact on the design cycle of aerospace flight vehicles and their components. CFD is also being used to better understand the fluid physics of flows heretofore not understood, such as three-dimensional separation. CFD is also being used to complement and is complemented by experiments. In this paper, the primary and secondary pacing items that have governed CFD in the past are reviewed and updated. The future prospects of CFD are explored, which will offer people working in the discipline challenges that should extend the technological life cycle to further increase the capabilities of a proven and demonstrated technology.
    Keywords: AERODYNAMICS
    Type: National Aerospace Lab., Proceedings of the 4th NAL Symposium on Aircraft Computational Aerodynamics; p 203-213
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  • 4
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    Supercomputing in Aerospace (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Topics addressed include: numerical aerodynamic simulation; computational mechanics; supercomputers; aerospace propulsion systems; computational modeling in ballistics; turbulence modeling; computational chemistry; computational fluid dynamics; and computational astrophysics.
    Keywords: AERODYNAMICS
    Type: NASA-CP-2454 , A-87082 , NAS 1.55:2454
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  • 5
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    Multidisciplinary computational aerosciences (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: As the challenges of single disciplinary computational physics are met, such as computational fluid dynamics, computational structural mechanics, computational propulsion, computational aeroacoustics, computational electromagnetics, etc., scientists have begun investigating the combination of these single disciplines into what is being called multidisciplinary computational aerosciences (MCAS). The combination of several disciplines not only offers simulation realism but also formidable computational challenges. The solution of such problems will require computers orders of magnitude larger than those currently available. Such computer power can only be supplied by massively parallel machines because of the current speed-of-light limitation of conventional serial systems. Even with such machines, MCAS problems will require hundreds of hours for their solution. To efficiently utilize such a machine, research is required in three areas that include parallel architectures, systems software, and applications software. The main emphasis of this paper is the applications software element. Examples that demonstrate application software for multidisciplinary problems currently being solved at NASA Ames Research Center are presented. Pacing items for MCAS are discussed such as solution methodology, physical modeling, computer power, and multidisciplinary validation experiments.
    Keywords: AERONAUTICS (GENERAL)
    Type: NASA-TM-103946 , A-92127 , NAS 1.15:103946
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  • 6
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    NAS: The first year (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Discussed are the capabilities of NASA's Numerical Aerodynamic Simulation (NAS) Program and its application as an advanced supercomputing system for computational fluid dynamics (CFD) research. First, the paper describes the NAS computational system, called the NAS Processing System Network, and the advanced computational capabilities it offers as a consequence of carrying out the NAS pathfinder objective. Second, it presents examples of pioneering CFD research accomplished during NAS's first operational year. Examples are included which illustrate CFD applications for predicting fluid phenomena, complementing and supplementing experimentation, and aiding in design. Finally, pacing elements and future directions for CFD and NAS are discussed.
    Keywords: COMPUTER SYSTEMS
    Type: NASA-TM-101006 , A-88187 , NAS 1.15:101006
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  • 7
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    Progress and future directions in computational fluid dynamics (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Computational fluid dynamics (CFD) has made great strides in the detailed simulation of complex fluid flows, including the fluid physics of flows heretofore not understood. It is now being routinely applied to some rather complicated problems, and starting to impact the design cycle of aerospace vehicles and their components. In addition, it is being used to complement and is being complemented by experimental studies. In this paper some major elements of contemporary CFD research, such as code validation, turbulence physics, and hypersonic flows are discussed, along with a review of the principal pacing items that currently govern CFD. Several examples are presented to illustrate the current state of the art. Finally, prospects for the future of the development and application of CFD are suggested.
    Keywords: AERONAUTICS (GENERAL)
    Type: NASA-TM-100091 , A-88128 , NAS 1.15:100091
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  • 8
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    CFD in design - A government perspective (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Some of the research programs involving the use of CFD in the aerodynamic design process at government laboratories around the United States are presented. Technology transfer issues and future directions in the discipline or CFD are addressed. The major challengers in the aerosciences as well as other disciplines that will require high-performance computing resources such as massively parallel computers are examined.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 89-0094
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  • 9
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    Status of computational fluid dynamics in the United States (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: CFD-related progress in U.S. aerospace industries and research institutions is evaluated with respect to methods employed, their applications, and the computer technologies employed in their implementation. Goals for subsonic CFD are primarily aimed at greater fuel efficiency; those of supersonic CFD involve the achievement of high sustained cruise efficiency. Transatmospheric/hypersonic vehicles are noted to have recently become important concerns for CFD efforts. Attention is given to aspects of discretization, Euler and Navier-Stokes general purpose codes, zonal equation methods, internal and external flows, and the impact of supercomputers and their networks in advancing the state-of-the-art.
    Keywords: MATHEMATICAL AND COMPUTER SCIENCES (GENERAL)
    Type: AIAA PAPER 87-1135
    Format: text
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  • 10
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    Numerical Simulation of Flow Through an Artificial Heart (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A solution procedure was developed that solves the unsteady, incompressible Navier-Stokes equations, and was used to numerically simulate viscous incompressible flow through a model of the Pennsylvania State artificial heart. The solution algorithm is based on the artificial compressibility method, and uses flux-difference splitting to upwind the convective terms; a line-relaxation scheme is used to solve the equations. The time-accuracy of the method is obtained by iteratively solving the equations at each physical time step. The artificial heart geometry involves a piston-type action with a moving solid wall. A single H-grid is fit inside the heart chamber. The grid is continuously compressed and expanded with a constant number of grid points to accommodate the moving piston. The computational domain ends at the valve openings where nonreflective boundary conditions based on the method of characteristics are applied. Although a number of simplifing assumptions were made regarding the geometry, the computational results agreed reasonably well with an experimental picture. The computer time requirements for this flow simulation, however, are quite extensive. Computational study of this type of geometry would benefit greatly from improvements in computer hardware speed and algorithm efficiency enhancements.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-TM-102183 , A-89099 , NAS 1.15:102183
    Format: application/pdf
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