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http://dx.doi.org/10.3744/SNAK.2004.41.4.017

Internal Wave Computations based on a Discontinuity in Dynamic Pressure  

신상묵 (국방과학연구소)
김동훈 (국방과학연구소)
Publication Information
Journal of the Society of Naval Architects of Korea / v.41, no.4, 2004 , pp. 17-29 More about this Journal
Abstract
Internal waves are computed using a ghost fluid method on an unstructured grid. Discontinuities in density and dynamic pressure are captured in one cell without smearing or oscillations along a multimaterial interface. A time-accurate incompressible Navier-Stokes/Euler solver is developed based on a three-point backward difference formula for the physical time marching. Artificial compressibility is introduced with respect to pseudotime and an implicit method is used for the pseudotime iteration. To track evolution of an interface, a level set function is coupled with the governing equations. Roe's flux difference splitting method is used to calculate numerical fluxes of the coupled equations. To get higher order accuracy, dependent variables are reconstructed based on gradients which are calculated using Gauss theorem. For each edge crossing an interface, dynamic pressure is assigned for a ghost node to enforce the continuity of total pressure along the interface. Solitary internal waves are computed and the results are compared with other computational and experimental results.
Keywords
Ghost fluid method; Unstructured grids; Level set; incompressible multimaterial flow; Solitary internal waves;
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Times Cited By KSCI : 4  (Citation Analysis)
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