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Acceleration Strategies Based on an Improved Bubble Packing Method

Published online by Cambridge University Press:  03 June 2015

Nan Qi ,
Yufeng Nie  and
Weiwei Zhang
Nan Qi*
Affiliation:
Department of Applied Mathematics, School of Science, Northwestern Polytechnical University, 127 Youyi West Road, Xi’an 710129, China
Yufeng Nie*
Affiliation:
Department of Applied Mathematics, School of Science, Northwestern Polytechnical University, 127 Youyi West Road, Xi’an 710129, China
Weiwei Zhang*
Affiliation:
Department of Applied Mathematics, School of Science, Northwestern Polytechnical University, 127 Youyi West Road, Xi’an 710129, China
*
Email:appleflowerqn@163.com
Corresponding author.Email:yfnie@nwpu.edu.cn
Email:zhangweiwei@mail.nwpu.edu.cn
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Abstract

The bubble packing method can generate high-quality node sets in simple and complex domains. However, its efficiency remains to be improved. This study is a part of an ongoing effort to introduce several acceleration schemes to reduce the cost of simulation. Firstly, allow the viscosity coefficient c in the bubble governing equations to change according the coordinate of the bubble which are defined separately as odd and normal bubbles, and meanwhile with the saw-shape relationship with time or iterations. Then, in order to relieve the over crowded initial bubble placement, two coefficients w1 and w2 are introduced to modify the insertion criterion. The range of those two coefficients are discussed to be w1 = 1, w2 ∈ [0.5,0.8]. Finally, a self-adaptive termination condition is logically set when the stable system equilibrium is achieved. Numerical examples illustrate that the computing cost can significantly decrease by roughly 80% via adopting various combination of proper schemes (except the uniform placement example), and the average qualities of corresponding Delaunay triangulation substantially exceed 0.9. It shows that those strategies are efficient and can generate a node set with high quality.

Keywords

65L5065B99Bubble packing methodalgorithm efficiencyviscosity coefficientmesh generationDelaunay triangulation.
Type
Research Article
Information
Communications in Computational Physics , Volume 16 , Issue 1 , July 2014 , pp. 115 - 135
Copyright
Copyright © Global Science Press Limited 2014

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