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    An improved ghost-cell immersed boundary method for compressible flow simulations

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    Chi_et_al-2016-International_Journal_for_Numerical_Methods_in_Fluids.pdf
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    Type
    Article
    Authors
    Chi, Cheng cc
    Lee, Bok Jik
    Im, Hong G. cc
    KAUST Department
    Clean Combustion Research Center
    Computational Reacting Flow Laboratory (CRFL)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-06-17
    Online Publication Date
    2016-06-17
    Print Publication Date
    2017-01-20
    Permanent link to this record
    http://hdl.handle.net/10754/610650
    
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    Abstract
    This study presents an improved ghost-cell immersed boundary approach to represent a solid body in compressible flow simulations. In contrast to the commonly used approaches, in the present work ghost cells are mirrored through the boundary described using a level-set method to farther image points, incorporating a higher-order extra/interpolation scheme for the ghost cell values. A sensor is introduced to deal with image points near the discontinuities in the flow field. Adaptive mesh refinement (AMR) is used to improve the representation of the geometry efficiently in the Cartesian grid system. The improved ghost-cell method is validated against four test cases: (a) double Mach reflections on a ramp, (b) smooth Prandtl-Meyer expansion flows, (c) supersonic flows in a wind tunnel with a forward-facing step, and (d) supersonic flows over a circular cylinder. It is demonstrated that the improved ghost-cell method can reach the accuracy of second order in L1 norm and higher than first order in L∞ norm. Direct comparisons against the cut-cell method demonstrate that the improved ghost-cell method is almost equally accurate with better efficiency for boundary representation in high-fidelity compressible flow simulations. Copyright © 2016 John Wiley & Sons, Ltd.
    Citation
    An improved ghost-cell immersed boundary method for compressible flow simulations 2016 International Journal for Numerical Methods in Fluids
    Sponsors
    The work reported in this study was supported by the King Abdullah University of Science and Technology (KAUST).
    Publisher
    Wiley
    Journal
    International Journal for Numerical Methods in Fluids
    DOI
    10.1002/fld.4262
    Additional Links
    http://doi.wiley.com/10.1002/fld.4262
    ae974a485f413a2113503eed53cd6c53
    10.1002/fld.4262
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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