Triangular mesh generation on free-form surfaces based on bubble dynamics simulation. Issue 2 (21st January 2019)

• Record Type: Journal Article
• Authors: Wang, Qisheng; Gao, Boqing; Wu, Hui
• Is Part Of: Engineering computations. Volume 36:Issue 2(2019)
• Page Start: 646
• Page End: 663
• Publication Date: 2019-01-21
• Subjects: Free-form surface -- Grid structure -- Mesh generation -- Mesh relaxation -- Bubble-like method -- Delaunay triangulation; Computer-aided engineering -- Periodicals; Computer graphics -- Periodicals; 620.00285
• DOI: 10.1108/EC-09-2017-0352
• Languages: English
• ISSNs: 0264-4401

Abstract

Abstract : Purpose: Modern CAD systems facilitate the creation of any surface geometry imaginable, and complex surfaces for free-form grid shells are often represented by a set of Non-Uniform Rational B-Splines surface patches. But it remains an intractable issue how to generate high-quality grids on complex surfaces efficiently. To solve this issue, an automatic triangular mesh generation method is presented, based on bubble dynamics simulation and a modified Delaunay method. Design/methodology/approach: A moderate amount of points are first distributed on a given surface. Next, by regarding the points as elastic bubbles with the same size and introducing the forces acting on bubbles, the motion control equations of bubbles are established. The equilibrium state of the bubble system is found by Verlet algorithm. Then, the Voronoi diagram on the surface is obtained by calculating the intersection between the surface and the three-dimensional (3D) Voronoi diagram of the centers of bubbles. Finally, a triangular mesh, Delaunay triangulation on the surface, is determined based on the dual change of the Voronoi diagram. Findings: This method generates meshes on the surface directly, unlike mapping-based methods, avoiding the mapping distortion. Examples are given to demonstrate the successful execution of this method. The result also illustrates that this method is applicable to various surfaces in high automation level and resultant meshes are highly uniform and well-shaped. Originality/value: Thus, this method provides the convenience for the geometry design of complex free-form grid structure.