The fully discrete fractional-step method for the Oldroyd model

The fully discrete fractional-step method for the Oldroyd model
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Oldroyd 模型的完全离散分步法

DOI:
10.1016/j.apnum.2018.03.003
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发表时间:
2018-07
影响因子:
2.8
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;Yuan JinYun

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在本文中,我们考虑的Oldroyd模型的全离散分数步公式的数值解的稳定性和收敛性结果。该数值方法由粘性系数在时间上的分解和有限元法在空间上的分解构成。通过对精确解的正则性作适当的假设,得到了近似解的无条件稳定性结果。然后,一阶空间收敛的“结束步骤”的速度。在此基础上,得到了在不同网格尺寸下,速度和压力在L2范数下的最优阶近似。最后,给出了两个数值例子来说明所建立的理论分析和测试性能的发展数值方法,并显示记忆项所考虑的问题的影响.
In this paper, we consider the stability and convergence results of numerical solutions in fully discrete fractional-step formulation for the Oldroyd model. The proposed numerical method is constructed by the decompositions of the viscosity in time part and the finite element method in space part. With some mild regularity assumptions on the exact solution, the unconditional stability results of the approximate solutions are established. Then, the first order spatial convergence for the “end-of-step” velocity is shown. Based on the above results, the optimal order approximations for the velocity and pressure in L 2-norm are obtained for the mesh size. Finally, two numerical examples are given to illustrate the established theoretical analysis and test the performances of the developed numerical method and show the influences of the memory term for the considered problem.
DOI: 10.1137/07069609x
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期刊: SIAM J. Numer. Anal.
影响因子: --
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