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  • 1
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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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  • 2
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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
  • 3
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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
  • 4
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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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  • 5
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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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