期刊
SIAM JOURNAL ON SCIENTIFIC COMPUTING
卷 42, 期 1, 页码 B135-B156出版社
SIAM PUBLICATIONS
DOI: 10.1137/18M1213579
关键词
high-order; gradient flow; energy stable; phase field; thermodynamically consistent
资金
- Natural Science Foundation of Jiangsu Province [BK20180413]
- National Natural Science Foundation of China [11801269]
- National Science Foundation [NSF DMS-1816783]
- NSFC [11571032, 91630207, NSAF-U1530401]
- [NSF-DMS-1517347]
- [DMS-1815921]
- [OIA-1655740]
We present a systematic approach to developing arbitrarily high-order, unconditionally energy stable numerical schemes for thermodynamically consistent gradient flow models that satisfy energy dissipation laws. Utilizing the energy quadratization method, we formulate the gradient flow model into an equivalent form with a corresponding quadratic free energy functional. Based on the equivalent form with a quadratic energy, we propose two classes of energy stable numerical approximations. In the first approach, we use a prediction-correction strategy to improve the accuracy of linear numerical schemes. In the second approach, we adopt the Gaussian collocation method to discretize the equivalent form with a quadratic energy, arriving at an arbitrarily high-order scheme for gradient flow models. Schemes derived using both approaches are proved rigorously to be unconditionally energy stable. The proposed schemes are then implemented in four gradient flow models numerically to demonstrate their accuracy and effectiveness. Detailed numerical comparisons among these schemes are carried out as well. These numerical strategies are rather general so that they can be readily generalized to solve any thermodynamically consistent PDE models.
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