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There are a total of 19 record(s) matching your query.
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Positivity-preserving numerical schemes for multidimensional advection
Author(s): Leonard, B. P.; Macvean, M. K.; Lock, A. P.
Abstract: This report describes the construction of an explicit, single time-step, conservative, finite-volume method for multidimensional advective flow, based on a uniformly third-order polynomial interpolation algorithm (UTOPIA). ...
NASA Center: Glenn Research Center
Publication Year: 1993
Added to NTRS: 2008-02-04
Accession Number: 93N27091; Document ID: 19930017902; Report Number: E-7656, ICOMP-93-05, NAS 1.15:106055, NASA-TM-106055
Cost-effective accurate coarse-grid method for highly convective multidimensional unsteady flows
Author(s): Leonard, B. P.; Niknafs, H. S.
Abstract: A fundamentally multidimensional convection scheme is described based on vector transient interpolation modeling rewritten in conservative control-volume form. Vector third-order upwinding is used as the basis of the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1991
Added to NTRS: 2008-01-29
Accession Number: 91N21075; Document ID: 19910011762
Development of an algebraic turbulence model for analysis of propulsion flows
Author(s): Georgiadis, N. J.; Drummond, J. E.; Leonard, B. P.
Abstract: A simple turbulence model that will be applicable to propulsion flows having both wall bounded and unbounded regions was developed and installed within the PARC Navier-Stokes code by linking two existing algebraic turbulence ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N27517; Document ID: 19920018274; Report Number: AIAA PAPER 92-3861, E-7089, NAS 1.15:105701, NASA-TM-105701
Universal limiter for transient interpolation modeling of the advective transport equations: The ULTIMATE conservative difference scheme
Author(s): Leonard, B. P.
Abstract: A fresh approach is taken to the embarrassingly difficult problem of adequately modeling simple pure advection. An explicit conservative control-volume formation makes use of a universal limiter for transient interpolation ...
NASA Center: Glenn Research Center
Publication Year: 1988
Added to NTRS: 2005-08-25
Accession Number: 89N14794; Document ID: 19890005423; Report Number: E-4169, ICOMP-88-11, NAS 1.15:100916, NASA-TM-100916
ULTRA-SHARP nonoscillatory convection schemes for high-speed steady multidimensional flow
Author(s): Leonard, B. P.; Mokhtari, Simin
Abstract: For convection-dominated flows, classical second-order methods are notoriously oscillatory and often unstable. For this reason, many computational fluid dynamicists have adopted various forms of (inherently stable) ...
NASA Center: Glenn Research Center
Publication Year: 1990
Added to NTRS: 2005-08-25
Accession Number: 90N21570; Document ID: 19900012254; Report Number: E-5320, ICOMP-90-12, NAS 1.15:102568, NASA-TM-102568
A modified mixing length turbulence model for zero and adverse pressure gradients
Author(s): Conley, Julianne M.; Leonard, B. P.
Abstract: The modified mixing length (MML) turbulence model was installed in the Proteus Navier-Stokes code, then modified to make it applicable to a wider range of flows typical of aerospace propulsion applications. The modifications ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2005-08-25
Accession Number: 95N14607; Document ID: 19950008193; Report Number: E-9220, NAS 1.15:106772, NASA-TM-106772
Order of accuracy of QUICK and related convection-diffusion schemes
Author(s): Leonard, B. P.
Abstract: This report attempts to correct some misunderstandings that have appeared in the literature concerning the order of accuracy of the QUICK scheme for steady-state convective modeling. Other related convection-diffusion ...
NASA Center: Glenn Research Center
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 94N21588; Document ID: 19940017115; Report Number: E-8236, ICOMP-93-47, NAS 1.15:106402, NASA-TM-106402
A cost-effective strategy for nonoscillatory convection without clipping
Author(s): Leonard, B. P.; Niknafs, H. S.
Abstract: Clipping of narrow extrema and distortion of smooth profiles is a well known problem associated with so-called high resolution nonoscillatory convection schemes. A strategy is presented for accurately simulating highly ...
NASA Center: Glenn Research Center
Publication Year: 1990
Added to NTRS: 2005-08-25
Accession Number: 90N21291; Document ID: 19900011975; Report Number: E-5336, ICOMP-90-09, NAS 1.15:102538, NASA-TM-102538
Comparison of truncation error of finite-difference and finite-volume formulations of convection terms
Author(s): Leonard, B. P.
Abstract: Judging by errors in the computational-fluid-dynamics literature in recent years, it is not generally well understood that (above first-order) there are significant differences in spatial truncation error between ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 93N11531; Document ID: 19930002343; Report Number: E-7321, ICOMP-92-19, NAS 1.15:105861, NASA-TM-105861
The flux-integral method for multidimensional convection and diffusion
Author(s): Leonard, B. P.; Macvean, M. K.; Lock, A. P.
Abstract: The flux-integral method is a procedure for constructing an explicit, single-step, forward-in-time, conservative, control volume update of the unsteady, multidimensional convection-diffusion equation. The convective plus ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2005-08-25
Accession Number: 95N11245; Document ID: 19950004832; Report Number: E-9019, ICOMP-94-13, NAS 1.15:106679, NASA-TM-106679
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