Optimal time-decay estimates for an Oldroyd-B model with zero viscosity

Optimal time-decay estimates for an Oldroyd-B model with zero viscosity
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零粘度 Oldroyd-B 模型的最佳时间衰减估计

DOI:
10.1016/j.jde.2021.10.046
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发表时间:
2021-11
影响因子:
2.4
通讯作者:
Zi Ruizhao
Zi Ruizhao
中科院分区:
数学2区
文献类型:
--
作者:
Huang Jinrui;Wang Yinghui;Wen Huanyao;Zi Ruizhao

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本文考虑三维扩散Oldroplast-B模型的Cauchy问题。通过分析上、下时间衰减估计,得到了一些最优的解的时间衰减率,条件是初始数据很小,且在低频区域,初始速度的傅里叶变换的绝对值远离零。值得注意的是,最优速率与流体粘度或扩散系数无关,这与不可压Navier-Stokes方程的现象不同。
In this work, we consider the Cauchy problem for a diffusive Oldroyd-B model in three dimensions. Some optimal time-decay rates of the solutions are derived via analysis of upper and lower time-decay estimates provided that the initial data are small and that the absolute value of Fourier transform of the initial velocity is bounded below away from zero in a low-frequency region. It is worth noticing that the optimal rates are independent of the fluid viscosity or the diffusive coefficient, which is a different phenomenon from that for incompressible Navier-Stokes equations.
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