Efficient computation of dendritic growth with r-adaptive finite element methods

Efficient computation of dendritic growth with r-adaptive finite element methods
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使用 r 自适应有限元方法有效计算枝晶生长

DOI:
10.1016/j.jcp.2008.02.016
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发表时间:
2008-06
影响因子:
4.1
通讯作者:
Li, Ruo
Li, Ruo
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tang, Tao;Wang, Heyu;Li, Ruo

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本文讨论了移动网格法在二维和三维树突生长相场模型求解中的应用。网格是自动包含边界条件的优化问题的解,并使用多网格方法进行求解。控制方程通过线性有限元在空间上离散化,并使用分割时间水平方案在时间上进行数值积分。该方法的一个新颖之处是正则化监控函数的选择。移动网格方法使我们能够以较小的自由度获得精确的数值解。数值证明我们的方法获得的尖端速度与之前发表的结果非常吻合。
This paper deals with the application of a moving grid method to the solution of a phase-field model for dendritic growth in two- and three-dimensions. A mesh is found as the solution of an optimization problem that automatically includes the boundary conditions and is solved using a multi-grid approach. The governing equations are discretized in space by linear finite elements and a split time-level scheme is used to numerically integrate in time. One novel aspect of the method is the choice of a regularized monitor function. The moving grid method enables us to obtain accurate numerical solutions with much less degree of freedoms. It is demonstrated numerically that the tip velocity obtained by our method is in good agreement with the previously published results.
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