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  • 1
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    ME8373 Spring 2015 ICME Proposal ICME Analysis of Fatigue Crack Growth Through a Weld in SA-516 Grade 70 Plate (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This paper describes work accomplished to predict the service life of a flexure joint design which is a component of a diffuser duct in the A3 Test Stand, an altitude simulation rocket engine test facility at NASA's Stennis Space Center. The duct has two pressure shells separated by cooling water passages and connected by stiffening ribs and flexure joints. Rocket exhaust flows within the duct and heats the inner pressure shell while the outer pressure shell remains at ambient temperature. The flexure joints allow for differential thermal expansion of the inner and outer pressure shells and are subject to in-service loading by this thermal expansion along with water pressure in the cooling water passage, atmospheric pressure outside the duct, near vacuum conditions within the duct, and vibrational loads from operation of the facility and rocket engine. Figure 1 shows a schematic axisymmetric cross section of the diffuser pressure shells and flexure joints with a zoomed in view of the flexure joint. The flexure joints are expected to eventually fail by fatigue cracking leading to leaks from the cooling water passages to the outside. The zoomed in view in Figure 1 indicates where cracking is expected to occur, namely through a weld bead between two plates of SA-516 Grade 70 steel. This weld bead acts as the fulcrum of the flexure joint and it is clear from inspection of the geometry and loading represented in the zoomed in portion of Figure 1 that inherent in the design there is a severe notch formed between the flexure plate, weld bead, and stiffening ring that will be the site of crack initiation and location from which the crack grows to the outer surface of the weld bead.
    Keywords: Mechanical Engineering; Aircraft Design, Testing and Performance
    Type: IS-2015-03-00031-SSC
    Format: application/pdf
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  • 2
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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
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  • 3
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    MSU Mechanical Engineering Proposed PhD Research for: Jody L. Woods (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: No abstract available
    Keywords: Mechanical Engineering
    Type: ET-2011-07-00007-SSC
    Format: application/pdf
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  • 4
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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
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  • 5
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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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  • 6
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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
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  • 7
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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
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  • 8
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    Application of ANSYS Workbench and CFX at NASA's John C. Stennis Space Center (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This viewgraph presentation reviews the overall work of the Stennis Space Center, with particular attention paid to the systems analysis and modeling being done with ANSYS Workbench and CFX. Examples of the analyses done with ANSYS Workbench and CFX and planned analyses are reviewed.
    Keywords: Numerical Analysis
    Type: 2007 ANSYS U.S. Regional Conference Series Texas; Feb 20, 2007 - Feb 22, 2007; Houston, TX; United States
    Format: application/pdf
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  • 9
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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: Computer Programming and Software
    Type: NASA/NP-2002-10-00035-SSC
    Format: text
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  • 10
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    Modeling Potential Carbon Monoxide Exposure Due to Operation of a Major Rocket Engine Altitude Test Facility Using Computational Fluid Dynamics (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This viewgraph presentation reviews computational fluid dynamics as a tool for modelling the dispersion of carbon monoxide at the Stennis Space Center's A3 Test Stand. The contents include: 1) Constellation Program; 2) Constellation Launch Vehicles; 3) J2X Engine; 4) A-3 Test Stand; 5) Chemical Steam Generators; 6) Emission Estimates; 7) Located in Existing Test Complex; 8) Computational Fluid Dynamics; 9) Computational Tools; 10) CO Modeling; 11) CO Model results; and 12) Next steps.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: SSTI-1840-0001 , American Industrial Hygiene Conference and Exposition; Jun 01, 2009 - Jun 04, 2009; Toronto, Ontario; Canada
    Format: application/pdf
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