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  • NUMERICAL ANALYSIS  (4)
  • Fluid Mechanics and Thermodynamics; Computer Programming and Software  (2)
  • 9781839105722  (1)
  • 1
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    Chapter 13: Methods development in evidence synthesis: a dialogue between science and society (2024)
    Edward Elgar Publishing | Edward Elgar Publishing
    Details
    Publication Date: 2024-02-23
    Description: This chapter is about the science of evidence synthesis: the way that academics bring together knowledge from across multiple studies into a whole, to present the state of current understanding about a given area. While scientists have been doing this for centuries in the form of literature reviews, the advent of ‘evidence informed’ decision-making over the past 30-40 years has forced academics to develop a form of literature review that was demonstrably the sum of available knowledge in its area (rather than providing a partial and potentially biased picture). The key challenge methodologically has been in providing useful and useable evidence that can inform decisions, whilst not compromising on the high standards that usually need to be met to make claims about causality. Addressing this challenge has required the evolution of new research methods across multiple disciplines - something that seems likely to continue into the future.
    Description: Published
    Keywords: Evidence synthesis; Systematic reviews; Methodology; Evidence-based medicine; Evidence informed policy and practice ; 9781839105722
    Language: English
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    E-BOOK
  • 2
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    An efficient iteration strategy for upwind/relaxation solutions to the thin-layer Navier-Stokes equations (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A previously developed upwind/relaxation algorithm for solving the unsteady, compressible, thin-layer Navier-Stokes equations is presently modified so that the downstream influence of the subsonic part of the boundary layer in an otherwise supersonic flow is suppressed by restricting the streamwise pressure gradient. A 'parabolized' solution is then efficiently obtained by marching downstream and iterating locally in each crossflow plane until achieving convergence. This parabolized solution is an excellent final one for problems without large adverse streamwise pressure gradients.
    Keywords: NUMERICAL ANALYSIS
    Type: AIAA PAPER 87-1113
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Three-dimensional multigrid algorithms for the flux-split Euler equations (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Full Approximation Scheme (FAS) multigrid method is applied to several implicit flux-split algorithms for solving the three-dimensional Euler equations in a body fitted coordinate system. Each of the splitting algorithms uses a variation of approximate factorization and is implemented in a finite volume formulation. The algorithms are all vectorizable with little or no scalar computation required. The flux vectors are split into upwind components using both the splittings of Steger-Warming and Van Leer. The stability and smoothing rate of each of the schemes are examined using a Fourier analysis of the complete system of equations. Results are presented for three-dimensional subsonic, transonic, and supersonic flows which demonstrate substantially improved convergence rates with the multigrid algorithm. The influence of using both a V-cycle and a W-cycle on the convergence is examined.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-TP-2829 , L-16416 , NAS 1.60:2829
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A comparison of numerical flux formulas for the Euler and Navier-Stokes equations (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Numerical flux formulas for the convection terms in the Euler or Navier-Stokes equations are analyzed with regard to their accuracy in representing steady nonlinear and linear waves (shocks and entropy/shear waves, respectively). Numerical results are obtained for a one-dimensional conical Navier-Stokes flow including both a shock and a boundary layer. Analysis and experiments indicate that for an accurate representation of both layers the flux formula must include information about all different waves by which neighboring cells interact, as in Roe's flux-difference splitting. In comparison, Van Leer's flux-vector splitting, which ignores the linear waves, badly diffuses the boundary layer. The results of MacCormack's scheme, if properly tuned, are significantly better. The use of a sufficiently detailed flux formula appears to reduce the number of cells required to resolve a boundary layer by a factor 1/2 to 1/4 and thus pays off.
    Keywords: NUMERICAL ANALYSIS
    Type: AIAA PAPER 87-1104
    Format: text
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  • 5
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    FUN3D Manual: 12.7 (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This manual describes the installation and execution of FUN3D version 12.7, including optional dependent packages. FUN3D is a suite of computational fluid dynamics simulation and design tools that uses mixed-element unstructured grids in a large number of formats, including structured multiblock and overset grid systems. A discretely-exact adjoint solver enables efficient gradient-based design and grid adaptation to reduce estimated discretization error. FUN3D is available with and without a reacting, real-gas capability. This generic gas option is available only for those persons that qualify for its beta release status.
    Keywords: Fluid Mechanics and Thermodynamics; Computer Programming and Software
    Type: NASA/TM2015218761 , L-20558 , NF1676L-21337
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    NASA TECHNICAL REPORTS
  • 6
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    Iteration strategy for upwind/relaxation solutions to the thin-layer Navier-Stokes equations (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: NUMERICAL ANALYSIS
    Type: AIAA Journal (ISSN 0001-1452); 27; 1165
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    FUN3D Manual: 12.6 (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This manual describes the installation and execution of FUN3D version 12.6, including optional dependent packages. FUN3D is a suite of computational fluid dynamics simulation and design tools that uses mixed-element unstructured grids in a large number of formats, including structured multiblock and overset grid systems. A discretely-exact adjoint solver enables efficient gradient-based design and grid adaptation to reduce estimated discretization error. FUN3D is available with and without a reacting, real-gas capability. This generic gas option is available only for those persons that qualify for its beta release status.
    Keywords: Fluid Mechanics and Thermodynamics; Computer Programming and Software
    Type: NASA/TM2015-218690 , L-20538 , NF1676L-20842
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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