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  • 1
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    Development and application of a 3D Cartesian grid Euler method (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report describes recent progress in the development and application of 3D Cartesian grid generation and Euler flow solution techniques. Improvements to flow field grid generation algorithms, geometry representations, and geometry refinement criteria are presented, including details of a procedure for correctly identifying and resolving extremely thin surface features. An initial implementation of automatic flow field refinement is also presented. Results for several 3D multi-component configurations are provided and discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Lewis Research Center, Surface Modeling, Grid Generation, and Related Issues in Computational Fluid Dynamic (CFD) Solutions; p 225-249
    Format: application/pdf
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  • 2
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    Adaptive finite difference methods in fluid dynamics (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An adaptive method to solve partial differential equations in fluid mechanics is presented. The approach requires internal boundary conditions that must be conservative, data structures for keeping track of several layers of fine grid patches, error estimation, and heuristics for automatic grid generation. In practical calculations gains in computer efficiency up to 10 over nonadaptive methods are observed. The whole procedure takes 3000 lines of FORTRAN code.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Von Karman Inst. for Fluid Dynamics, Computational Fluid Dynamics; 50 p
    Format: text
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  • 3
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    Modeling Issues in Asteroid-Generated Tsunamis (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This report studies tsunamis caused by asteroids, both those that arise from atmospheric blast waves moving across the water surface from airburst asteroids, and those that arise when the asteroid reaches the water and forms a crater. We perform numerical experiments that compare simulations using depth-averaged models (shallow water and several forms of Boussinesq) with linearized Euler (acoustics plus gravity) and ALE hydrocode simulations. We find that neither of the depth-averaged models do a good job of initiating the tsunami, but in some cases can be used to propagate a solution generated by a higher-fidelity method. A list of our conclusions and recommendations for further study is given in Section 5.
    Keywords: Oceanography
    Type: NASA/CR-2018-219786 , ARC-E-DAA-TN53167
    Format: application/pdf
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