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  • 1
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    Diffusion in periodic potentials with path integral hyperdynamics (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-08-06
    Description: Author(s): T. Ikonen, M. D. Khandkar, L. Y. Chen, S. C. Ying, and T. Ala-Nissila We consider the diffusion of Brownian particles in one-dimensional periodic potentials as a test bench for the recently proposed stochastic path integral hyperdynamics (PIHD) scheme [ Chen and Horing, J. Chem. Phys. 126 , 224103 (2007) ]. First, we consider the case where PIHD is used to enhance the tr... [Phys. Rev. E 84, 026703] Published Fri Aug 05, 2011
    Keywords: Computational physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    An iterative implicit DDADI algorithm for solving the Navier-Stokes equation (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: An algorithm utilizing a first order upwind split flux technique and the diagonally dominant treatment is proposed to be the temporal operator for solving the Navier-Stokes equations. Given the limit of a five point stencil, the right hand side flux derivatives are formulated by several commonly used central and upwind schemes. Their performances are studied through a test case of free vortex convection in a uniform stream. From these results, a superior treatment for evaluating the flux term is proposed and compared with the rest. The application of the proposed algorithm to the full Navier-Stokes equations is demonstrated through a calculation of flow over a backward facing step. Results are compared against the calculation done by using the fourth order central differencing scheme with artificial damping.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Computational Fluid Dynamics; p 29-46
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Three-dimensional adaptive grid generation for body-fitted coordinate system (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report describes a numerical method for generating 3-D grids for general configurations. The basic method involves the solution of a set of quasi-linear elliptic partial differential equations via pointwise relaxation with a local relaxation factor. It allows specification of the grid spacing off the boundary surfaces and the grid orthogonality at the boundary surfaces. It includes adaptive mechanisms to improve smoothness, orthogonality, and flow resolution in the grid interior.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-182192 , E-4331 , NAS 1.26:182192
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Rapid distortion of small-scale turbulence by an axisymmetric contraction (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The rapid distortion of small-scale turbulence by an axisymmetric internal contracting flow has been investigated. The analysis is an example of the modern version of rapid distortion theory in that the effects of vortex bending and tilting are included. On the axis of symmetry, the classical results are recovered. The longitudinal and lateral velocity components are suppressed and amplified, respectively, with increasing contraction ratio. These effects are enhanced with increasing radial position. The numerical calculations also show that the correlation between the streamwise and radial velocity components increases monotonically with respect to both the radial location and the contraction ratio. The longitudinal and lateral one-dimensional spectra show a shift towards higher and lower wavenumbers, respectively, as the contraction ratio increases. Here, these effects become less pronounced for larger radii. These results also show that the downstream longitudinal integral length scale based on the streamwise velocity as well as the one based on the transverse velocity increase with the radial coordinate.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Physics of Fluids; 26; Feb. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Three-dimensional elliptic grid generation technique with application to turbomachinery cascades (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Described is a numerical method for generating 3-D grids for turbomachinery computational fluid dynamic codes. The basic method is general and involves the solution of a quasi-linear elliptic partial differential equation via pointwise relaxation with a local relaxation factor. It allows specification of the grid point distribution on the boundary surfaces, the grid spacing off the boundary surfaces, and the grid orthogonality at the boundary surfaces. A geometry preprocessor constructs the grid point distributions on the boundary surfaces for general turbomachinery cascades. Representative results are shown for a C-grid and an H-grid for a turbine rotor. Two appendices serve as user's manuals for the basic solver and the geometry preprocessor.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-101330 , E-4342 , NAS 1.15:101330
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Three-dimensional adaptive grid generation for body-fitted coordinate system (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This report describes a numerical method for generating 3-D grids for general configurations. The basic method involves the solution of a set of quasi-linear elliptic partial differential equations via pointwise relaxation with a local relaxation factor. It allows specification of the grid spacing off the boundary surfaces and the grid orthogonality at the boundary surfaces. It includes adaptive mechanisms to improve smoothness, orthogonality, and flow resolution in the grid interior.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Intl. Conference on Numerical Grid Generation in Computational Fluid Mechanics ''88; Dec 05, 1988 - Dec 08, 1988; Miami Beach, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Global aspects of the Los Alamos general circulation model hydrologic cycle (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The global hydrologic cycle in the Los Alamos general circulation model (GCM) is compared to available global observations. Global observations of the water vapor, water-vapor flux and water-vapor flux divergence are derived from the National Meteorological Center's final analysis for the period 1986-1989. The new precipitation data set of Legates and Willmott (1990) is used for the global precipitation observations. Global evaporation is derived as a residual of the precipitation and water-vapor flux divergence. There are a number of similarities as well as discrepancies between the GCM and observations. The large-scale nondivergent and divergent GCM circulations are remarkably similar to the observed circulations; the large-scale GCM precipitation and evaporation patterns are also qualitatively similar to observations. Discrepancies are mainly quantitative and small-scale in nature: the GCM atmosphere is relatively dry which results in a slightly greater evaporation and precipitation rate than is observed; the GCM South Pacific convergence zone is displaced too far to the northwest.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; D9 J; 10
    Format: text
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    NASA TECHNICAL REPORTS
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