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  • 1
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    Software for Refining or Coarsening Computational Grids (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A computer program performs calculations for refinement or coarsening of computational grids of the type called structured (signifying that they are geometrically regular and/or are specified by relatively simple algebraic expressions). This program is designed to facilitate analysis of the numerical effects of changing structured grids utilized in computational fluid dynamics (CFD) software. Unlike prior grid-refinement and -coarsening programs, this program is not limited to doubling or halving: the user can specify any refinement or coarsening ratio, which can have a noninteger value. In addition to this ratio, the program accepts, as input, a grid file and the associated restart file, which is basically a file containing the most recent iteration of flow-field variables computed on the grid. The program then refines or coarsens the grid as specified, while maintaining the geometry and the stretching characteristics of the original grid. The program can interpolate from the input restart file to create a restart file for the refined or coarsened grid. The program provides a graphical user interface that facilitates the entry of input data for the grid-generation and restart-interpolation routines.
    Keywords: Man/System Technology and Life Support
    Type: SSC-00167 , NASA Tech Briefs, October 2003; 17
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Software for Refining or Coarsening Computational Grids (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A computer program performs calculations for refinement or coarsening of computational grids of the type called "structured" (signifying that they are geometrically regular and/or are specified by relatively simple algebraic expressions). This program is designed to facilitate analysis of the numerical effects of changing structured grids utilized in computational fluid dynamics (CFD) software. Unlike prior grid-refinement and -coarsening programs, this program is not limited to doubling or halving: the user can specify any refinement or coarsening ratio, which can have a noninteger value. In addition to this ratio, the program accepts, as input, a grid file and the associated restart file, which is basically a file containing the most recent iteration of flow-field variables computed on the grid. The program then refines or coarsens the grid as specified, while maintaining the geometry and the stretching characteristics of the original grid. The program can interpolate from the input restart file to create a restart file for the refined or coarsened grid. The program provides a graphical user interface that facilitates the entry of input data for the grid-generation and restart-interpolation routines.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA/NP-2002-10-00035-SSC , SSC-00167-SM
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Computational Analysis of Cryogenic Flow Through a Control Valve (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The initial efforts to develop the capability to model valves used in rocket engine component testing at Stennis Space Center are documented. An axisymmetric model of a control valve with LN2 as the working fluid was developed. The goal was to predict the effect of change in the plug/sear region of the valve prior to testing. The valve flow coefficient was predicted for a range of plug positions. Verification of the calculations was carried out to quantify the uncertainty in the numerical answer. The modeled results compared well qualitatively to experimental trends. Additionally, insights into the flow processes in the valve were obtained. Benefits from the verification process included the ability to use coarser grids and insight into ways to reduce computational time by using double precision accuracy and non-integer grid ratios. Future valve modeling activities will include shape optimization of the valve/seat region and dynamic grid modeling.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: SE-2003-06-00044-SSC , Proceedings of FEDSM''03 4th ASME-JSME Joint Fluids Engineering Conference; Jul 06, 2003 - Jul 11, 2003; Honolulu, HI; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Progress in Valve Modeling at Stennis Space Center (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Efforts to develop the capability to model values used in testing rocket engine components are documented. Cryogenic liquid and gas valves models are presented.
    Keywords: Spacecraft Propulsion and Power
    Type: SE-2002-12-00080-SSC , 14th Annual Symposium on Propulsion; Dec 10, 2002 - Dec 11, 2002; State College, PA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 5
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    Progress in Valve Modeling at Stennis Space Center (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Understanding valve behavior will aid testing of rocket components at Stennis Space Center. The authors of this viewgraph presentation have developed a computational model for a cryogenic liquid control valve, and a gas pressure regulator valve. The model is a compressible/incompressible pressure-based FDNS code from Marshall Space Flight Center (MSFC). It is a k-epsilon turbulence model with wall functions.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: SE-2002-12-00081-SSC , 14th Annual Symposium on Propulsion; Dec 10, 2002 - Dec 11, 2002; State College, PA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unknown
    Software for Refining or Coarsening Computational Grids (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A computer program performs calculations for refinement or coarsening of computational grids of the type called 'structured' (signifying that they are geometrically regular and/or are specified by relatively simple algebraic expressions). This program is designed to facilitate analysis of the numerical effects of changing structured grids utilized in computational fluid dynamics (CFD) software. Unlike prior grid-refinement and -coarsening programs, this program is not limited to doubling or halving: the user can specify any refinement or coarsening ratio, which can have a noninteger value. In addition to this ratio, the program accepts, as input, a grid file and the associated restart file, which is basically a file containing the most recent iteration of flow-field variables computed on the grid. The program then refines or coarsens the grid as specified, while maintaining the geometry and the stretching characteristics of the original grid. The program can interpolate from the input restart file to create a restart file for the refined or coarsened grid. The program provides a graphical user interface that facilitates the entry of input data for the grid-generation and restart-interpolation routines.
    Keywords: Computer Programming and Software
    Type: NASA/NP-2002-10-00035-SSC
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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