A novel mesh regeneration algorithm for 2D FEM simulations of flows with moving boundary

JOURNAL OF COMPUTATIONAL PHYSICS

卷:230

Article

Yang, F. -L.²  Chen, C. H.¹  Young, D. L.¹ 

[1] Natl Taiwan Univ, Dept Civil Engn, Taipei 10617, Taiwan

[2] Natl Taiwan Univ, Dept Mech Engn, Taipei 10617, Taiwan

关键词: Mesh regeneration;    Moving FEM;    ALE;    Flow-structure interactions;    Vortex-induced vibration;   

DOI  :  10.1016/j.jcp.2011.01.008

来源: Elsevier

【 摘 要 】

A novel mesh regeneration algorithm is proposed to maintain the mesh structure during a finite element simulation of flows with moving solid boundary. With the current algorithm, a new body-fitted mesh can be efficiently constructed by solving a set of Laplace equations developed to specify the displacements of individual mesh elements. These equations are subjected to specific boundary conditions determined by the instantaneous body motion and other flow boundary conditions. The proposed mesh regeneration algorithm has been implemented on an arbitrary Lagrangian-Eulerian (ALE) framework that employs an operator-splitting technique to solve the Navier-Stokes equations. The integrated numerical scheme was validated by the numerical results of four existing problems: a flow over a backward-facing step, a uniform flow over a fixed cylinder, the vortex-induced vibration of an elastic cylinder in uniformly incident flow, and a complementary problem that compares the transient drag coefficient for a cylinder impulsively set into motion to that measured on a fixed cylinder in a starting flow. Good agreement with the numerical or experimental data in the literature was obtained and new transient flow dynamics was revealed. The scheme performance is further examined with respect to the parameter employed in the mesh regeneration algorithm. (c) 2011 Elsevier Inc. All rights reserved.

【 授权许可】

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