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arXiv 1904.09528math.AP
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二维正则化Stokes浸入边值问题:适定性、奇异极限和误差估计

Regularized Stokes Immersed Boundary Problems in Two Dimensions: Well-posedness, Singular Limit, and Error Estimates

Jiajun Tong

摘要:

受数值浸入边界方法的启发,我们引入了二维正则Stokes浸入边界问题来描述二维Stokes流中一维封闭弹性弦的正则运动,其中正则$δ$ -函数用来缓和流场和奇异强迫。我们建立了正则化问题的全局适定性,并证明了随着正则化参数的减小,正则化问题中的弦动力学收敛于没有正则化的Stokes浸入边界问题中的弦动力学.以非正则化问题为基准,推导了弦动力学在各种规范下的误差估计。我们严格的分析表明,正则化的问题,如果正则化的$δ$ -函数被适当地选择,实现更高的精度。这可能意味着潜在的改进,在数值方法,这是值得进一步研究。

英文摘要:

Inspired by the numerical immersed boundary method, we introduce regularized Stokes immersed boundary problems in two dimensions to describe regularized motion of a 1-D closed elastic string in a 2-D Stokes flow, in which a regularized $δ$-function is used to mollify the flow field and singular forcing. We establish global well-posedness of the regularized problems, and prove that as the regularization parameter diminishes, string dynamics in the regularized problems converge to that in the Stokes immersed boundary problem with no regularization. Viewing the un-regularized problem as a benchmark, we derive error estimates under various norms for the string dynamics. Our rigorous analysis shows that the regularized problems achieve improved accuracy if the regularized $δ$-function is suitably chosen. This may imply potential improvement in the numerical method, which is worth further investigation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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