An improved ghost-cell immersed boundary method for compressible flow simulations
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ArticleAuthors
Chi, Cheng
Lee, Bok Jik
Im, Hong G.

KAUST Department
Clean Combustion Research CenterComputational Reacting Flow Laboratory (CRFL)
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2016-06-17Online Publication Date
2016-06-17Print Publication Date
2017-01-20Permanent link to this record
http://hdl.handle.net/10754/610650
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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 FluidsSponsors
The work reported in this study was supported by the King Abdullah University of Science and Technology (KAUST).Publisher
WileyDOI
10.1002/fld.4262Additional Links
http://doi.wiley.com/10.1002/fld.4262ae974a485f413a2113503eed53cd6c53
10.1002/fld.4262