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  • FLUID MECHANICS AND HEAT TRANSFER  (4)
  • Numerical Analysis
  • Space Sciences (General)
  • 1985-1989  (4)
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  • 1
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    A fast efficient implicit scheme for the gasdynamic equations using a matrix reduction technique (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An efficient implicit finite-difference algorithm for the gasdynamic equations utilizing matrix reduction techniques is presented. A significant reduction in arithmetic operations is achieved without loss of the stability characteristics generality found in the Beam and Warming approximate factorization algorithm. Steady-state solutions to the conservative Euler equations in generalized coordinates are obtained for transonic flows and used to show that the method offers computational advantages over the conventional Beam and Warming scheme. Existing Beam and Warming codes can be retrofit with minimal effort. The theoretical extension of the matrix reduction technique to the full Navier-Stokes equations in Cartesian coordinates is presented in detail. Linear stability, using a Fourier stability analysis, is demonstrated and discussed for the one-dimensional Euler equations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 85-0439
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of implicit local linearization techniques for upwind and TVD algorithms (1987)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An attempt is made to investigate local time linearization techniques for implicit flux-difference splitting and flux-vector splitting schemes in the simplest settings (i.e., first-order spatial schemes and one-dimensional Euler flows). It is noted that first-order spatial schemes provide the simplest examples of schemes which are collective extensions of scalar TVD schemes. Simple analytical results concerning the local linearizations are highlighted and subsequently verified using a numerical fixed-point analysis on selected problems. It is noted that while primary emphasis is on asymptotic behavior, many of the results have implications for time-accurate calculations as well.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 87-0595
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Navier-Stokes computations for exotic airfoils (1986)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A hyperbolic grid generator with improvements for handling sharp corners and concave surfaces combined with a Navier-Stokes flow solver is applied to complex two dimensional airfoil configurations. Steady separated flow about an iced leading edge of an airfoil is presented. Unsteady viscous separated flows past an airfoil at two angles of attack with a spoiler deployed at 60 deg are compared with experiment. The spoiler computations are performed with two different topological maps of the physical domain to the computational domain. Graphical techniques for the static and unsteady display of the flow fields are discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 85-0109 , AIAA Aerospace Science Meeting; Jan 14, 1985 - Jan 17, 1985; Reno, NV; United States|Von Karman Inst. for Fluid Dynamics Numerical Techniques for Viscous Flow Calculations in Turbomachinery Bladings; 17 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Navier-Stokes computations for circulation controlled airfoils (1986)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Navier-Stokes computations of subsonic to transonic flow past airfoils with augmented lift due to rearward jet blowing over a curved trailing edge are presented. The approach uses a spiral grid topology. Solutions are obtained using a Navier-Stokes code which employs an implicit finite difference method, an algebraic turbulence model, and developments which improve stability, convergence, and accuracy. Results are compared against experiments for no jet blowing and moderate jet pressures and demonstrate the capability to compute these complicated flows.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 85-1587 , AIAA Fluid Dynamics and Plasmadynamics and Lasers Conference; Jul 16, 1985 - Jul 18, 1985; Cincinnati, OH; United States|Von Karman Inst. for Fluid Dynamics Numerical Techniques for Viscous Flow Calculations in Turbomachinery Bladings; 18 p
    Format: text
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    NASA TECHNICAL REPORTS
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