+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + NASA Center + Publication Year + Subject + Availability Options + Item/Media Type Selected Navigations: Author > Leveque, R. J. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 9 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order Intermediate boundary conditions for LOD, ADI and approximate factorization methods Author(s): Leveque, R. J. Abstract: A general approach to determining the correct intermediate boundary conditions for dimensional splitting methods is presented. The intermediate solution U is viewed as a second order accurate approximation to a modified ... NASA Center: Langley Research Center Publication Year: 1985 Added to NTRS: 2008-02-19 Accession Number: 85N29626; Document ID: 19850021314; Report Number: ICASE-85-21, NAS 1.26:172591, NASA-CR-172591 Fourier analysis of the SOR iteration Author(s): Leveque, R. J.; Trefethen, L. N. Abstract: The SOR iteration for solving linear systems of equations depends upon an overrelaxation factor omega. It is shown that for the standard model problem of Poisson's equation on a rectangle, the optimal omega and corresponding ... NASA Center: Langley Research Center Publication Year: 1986 Added to NTRS: 2005-10-13 Accession Number: 87N14055; Document ID: 19870004622; Report Number: AD-A211571, ICASE-86-63, NAS 1.26:178191, NASA-CR-178191 Numerical Methods For Chemically Reacting Flows Author(s): Leveque, R. J.; Yee, H. C. Abstract: Issues related to numerical stability, accuracy, and resolution discussed. Technical memorandum presents issues in numerical solution of hyperbolic conservation laws containing "stiff" (relatively large and rapidly changing) ... NASA Center: Ames Research Center Publication Year: 1990 Added to NTRS: 2005-09-30 Accession Number: 90B10627; Document ID: 19900000627; Report Number: ARC-12282 Stable boundary conditions for Cartesian grid calculations Author(s): Berger, M. J.; Leveque, R. J. Abstract: The inviscid Euler equations in complicated geometries are solved using a Cartesian grid. This requires solid wall boundary conditions in the irregular grid cells near the boundary. Since these cells may be orders of ... NASA Center: NASA (non Center Specific) Publication Year: 1990 Added to NTRS: 2005-08-25 Accession Number: 90N23139; Document ID: 19900013823; Report Number: AD-A223152, ICASE-90-37, NAS 1.26:182048, NASA-CR-182048 A study of numerical methods for hyperbolic conservation laws with stiff source terms Author(s): Leveque, R. J.; Yee, H. C. Abstract: The proper modeling of nonequilibrium gas dynamics is required in certain regimes of hypersonic flow. For inviscid flow this gives a system of conservation laws coupled with source terms representing the chemistry. Often a ... NASA Center: Ames Research Center Publication Year: 1988 Added to NTRS: 2005-08-25 Accession Number: 88N18343; Document ID: 19880008959; Report Number: A-88110, NAS 1.15:100075, NASA-TM-100075 A study of numerical methods for hyperbolic conservation laws with stiff source terms Author(s): Leveque, R. J.; Yee, H. C. Abstract: In the present study of the behavior of typical numerical methods in the case of a model advection equation having a parameter-dependent source term, two approaches to the incorporation of the source terms are used: ... NASA Center: Ames Research Center Publication Year: 1990 Added to NTRS: 2004-11-03 Accession Number: 90A21942; Document ID: 19900034887 A geometric approach to high resolution TVD schemes Author(s): Goodman, J. B.; Leveque, R. J. Abstract: A geometric approach, similar to Van Leer's MUSCL schemes, is used to construct a second-order accurate generalization of Godunov's method for solving scalar conservation laws. By making suitable approximations, a scheme is ... NASA Center: Langley Research Center Publication Year: 1984 Added to NTRS: 2004-11-03 Accession Number: 85N15449; Document ID: 19850007140; Report Number: ICASE-84-55, NAS 1.26:172484, NASA-CR-172484 Stable boundary conditions for Cartesian grid calculations Author(s): Berger, M. J.; Leveque, R. J. Abstract: The inviscid Euler equations in complicated geometries are solved using a Cartesian grid. This requires solid wall boundary conditions in the irregular grid cells near the boundary. Since these cells may be orders of ... NASA Center: NASA (non Center Specific) Publication Year: 1990 Added to NTRS: 2004-11-03 Accession Number: 91A42717; Document ID: 19910058094 On the resolvent condition in the Kreiss matrix theorem Author(s): Leveque, R. J.; Trefethen, L. N. Abstract: The Kreiss Matrix Theorem asserts the uniform equivalence over all N x N matrices of power boundedness and a certain resolvent estimate. It is shown that the ratio of the constants in these two conditions grows linearly with ... NASA Center: Langley Research Center Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 83N34659; Document ID: 19830026388; Report Number: NAS 1.26:172177, NASA-CR-172177, REPT-83-35 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007