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A combined level set/ghost cell immersed boundary representation for floating body simulations
Author(s) -
Bihs H.,
Kamath A.
Publication year - 2016
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.4333
Subject(s) - immersed boundary method , discretization , level set method , computational fluid dynamics , boundary (topology) , benchmark (surveying) , level set (data structures) , grid , fluid–structure interaction , free surface , algorithm , computer science , set (abstract data type) , representation (politics) , marching cubes , mesh generation , flow (mathematics) , mathematics , geometry , mathematical analysis , mechanics , finite element method , physics , artificial intelligence , visualization , law , segmentation , political science , programming language , politics , image segmentation , geodesy , thermodynamics , geography
Summary A six degrees of freedom (6DOF) algorithm is implemented in the open‐source CFD code REEF3D. The model solves the incompressible Navier–Stokes equations. Complex free surface dynamics are modeled with the level set method based on a two‐phase flow approach. The convection terms of the velocities and the level set method are treated with a high‐order weighted essentially non‐oscillatory discretization scheme. Together with the level set method for the free surface capturing, this algorithm can model the movement of rigid floating bodies and their interaction with the fluid. The 6DOF algorithm is implemented on a fixed grid. The solid‐fluid interface is represented with a combination of the level set method and ghost cell immersed boundary method. As a result, re‐meshing or overset grids are not necessary. The capability, accuracy, and numerical stability of the new algorithm is shown through benchmark applications for the fluid‐body interaction problem. Copyright © 2016 John Wiley & Sons, Ltd.