Stability and convergence analysis for a new phase field crystal model with a nonlocal Lagrange multiplier

Stability and convergence analysis for a new phase field crystal model with a nonlocal Lagrange multiplier
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具有非局部拉格朗日乘数的新相场晶体模型的稳定性和收敛性分析

DOI:
10.1002/mma.7080
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发表时间:
2020-06
影响因子:
2.9
通讯作者:
Tao Sun
Tao Sun
中科院分区:
数学4区
文献类型:
--
作者:
Shimin Lin;Junying Cao;Jun Zhang;Tao Sun

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在这项工作中,能量稳定的数值格式提出了解决PFC模型与非局部拉格朗日乘子。数值格式的构造基于不变能量二次化(IEQ)技术,将非线性系统转换为线性系统,而时间变量采用二阶格式离散。新格式中的稳定项可以平衡非线性项的影响。此外,我们还得到了数值解的无条件能量稳定性、唯一性和一致有界性,并且数值格式是O(δt2)阶收敛的.数值试验证实了理论结果。
In this work, an energy stable numerical scheme is proposed to solve the PFC model with a nonlocal Lagrange multiplier. The construction of the numerical scheme is based on invariant energy quadratization (IEQ) technique to transform a nonlinear system into a linear system, while the time variables are discretized by second‐order scheme. The stability term in the new scheme can balance the influence of nonlinear term. Moreover, we obtain the results of unconditional energy stability, uniqueness, and uniform boundedness of numerical solution, and the numerical scheme is convergent with order of O(δt2) . Several numerical tests are conducted to confirm the theoretical results.
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