An accurate and efficient method for automatic deformation of unstructured polyhedral grids to simulate the flow induced by the motion of solid objects
by Seongwon Kang; Sang Hyuk Lee; Nahmkeon Hur
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 13, No. 3/4, 2013

Abstract: In the present study, an efficient numerical method to deform an unstructured polyhedral grid for accurate simulations of a flow induced by a moving solid object is proposed. In order to overcome inefficiency of the existing methods based on the vertices of a computational cell, the present approach deforms the polyhedral grids adaptively using a network based on the centre of each computational cell. It is shown that the proposed method provides with an improved efficiency for an arbitrary Lagrangian-Eulerian (ALE) simulation of a flow with a moving solid object compared to the existing methods based on the vertices. It is also shown that a polyhedral grid results in a better numerical accuracy than a triangular grid. The present numerical methods were applied to flows around a fixed and oscillating circular cylinder with various Reynolds numbers and oscillating frequencies. The produced numerical results were verified against aerodynamic characteristics of the previous numerical studies.

Online publication date: Thu, 31-Oct-2013

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