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Title: Extension of local domain-free discretization method to simulate 3D flows with complex moving boundaries
Authors: Zhou, C.H.
Shu, C. 
Keywords: Carangiform swimming
Domain-free discretization
Immersed boundary
Moving boundary
Non-boundary-conforming method
Unsteady flows
Issue Date: 15-Jul-2012
Citation: Zhou, C.H., Shu, C. (2012-07-15). Extension of local domain-free discretization method to simulate 3D flows with complex moving boundaries. Computers and Fluids 64 : 98-107. ScholarBank@NUS Repository.
Abstract: This paper is the first endeavor to present the local domain-free discretization (DFD) method for the solution of the three-dimensional Navier-Stokes equations. The computational domain may contain complex moving boundaries. The strategy of DFD is that the discrete form of partial differential equations at an interior point may involve some points outside the solution domain. The functional values at the exterior dependent points are evaluated by the approximate form of solution near the boundary. Compared to the previous work, the tedious task of constructing new interpolation tetrahedrons is eliminated, and this reduces the complexity of DFD implementation. An efficient algorithm for classifying mesh points is also presented. Simulation of flow around a stationary sphere is used to validate the numerical method, and three distinct flow regimes have been obtained with varied Reynolds numbers of up to 300. The ability of the method for flows with complex moving boundary is demonstrated by simulating flows over an undulating fish-like body. The results of force coefficient, structure of wake patterns and propulsive efficiency at critical Strouhal number have been presented. All predictions show a good agreement with the reference data. © 2012 Elsevier Ltd.
Source Title: Computers and Fluids
ISSN: 00457930
DOI: 10.1016/j.compfluid.2012.05.012
Appears in Collections:Staff Publications

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