Stability and convergence of the higher projection method for the time-dependent viscoelastic flow problem

Stability and convergence of the higher projection method for the time-dependent viscoelastic flow problem
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含时粘弹性流动问题高投影法的稳定性和收敛性

DOI:
10.1016/j.cam.2017.12.045
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发表时间:
2018-08
影响因子:
2.4
通讯作者:
Yuan JinYun
Yuan JinYun
中科院分区:
数学2区
文献类型:
--
作者:
张通;千艳霞;蒋涛;Yuan JinYun

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本文提出并分析了时变粘弹性流动问题的时间离散高阶投影法。我们的数值方法是基于时间迭代离散格式。通过投影法,将所考虑的问题解耦为两个线性子问题:一个是速度子问题,另一个是压力子问题。建立了数值格式的无条件稳定性。给出了速度和压力的收敛结果。本文的主要结果是速度的收敛性分析是弱二阶的,压力的收敛性分析是弱一阶的。最后给出了数值算例,验证了所提出的数值算法的性能。
In this paper, the time discrete higher order projection method is proposed and analyzed for the time-dependent viscoelastic flow problem. Our numerical method is based on the time iterative discrete schemes. By the projection method, the considered problem is decoupled into two linear subproblems: One is for the velocity and the other is for the pressure. Unconditional stability of the numerical schemes is established. Convergence results for the velocity and pressure are also derived. Our main results of this paper are that the convergence analysis for the velocity is weakly second order and for the pressure is weakly first order. Finally, some numerical examples are provided to confirm the performances of the developed numerical algorithms.
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