An accurate and efficient method for automatic deformation of unstructured polyhedral grids to simulate the flow induced by the motion of solid objects

作者：Kang Seongwon; Lee Sang Hyuk; Hur Nahmkeon^*

来源：Progress in Computational Fluid Dynamics, 2013, 13(3-4): 182-190.

DOI：10.1504/PCFD.2013.053659

• unstructured polyhedral grid
• spring analogy
• computational fluid dynamics
• CFD
• arbitrary Lagrangian-Eulerian
• ALE

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.

• 出版日期2013