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arXiv 2202.13075math.APcs.NAmath.NA
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非等温非牛顿流体:稳态情形

Non-isothermal non-Newtonian fluids: the stationary case

Maurizio Grasselli, Nicola Parolini, Andrea Poiatti, Marco Verani

AI总结:

本文研究非等温非牛顿流体的稳态耦合问题,证明弱解存在性与正则性,并用有限元法逼近Carreau幂律情形,通过二维数值实验验证误差估计。

摘要:

本文研究了非牛顿不可压缩流体的稳态Navier-Stokes方程与稳态热方程的耦合问题,并施加Dirichlet型边界条件。假设粘度依赖于温度,而应力通过依赖于p∈(1,2)的适当幂律(剪切变稀情形)依赖于应变。对于该问题,我们建立了弱解的存在性,并证明了Navier-Stokes情形和Stokes情形的一些正则性结果。随后,针对Carreau幂律的后者情形,采用有限元(FEM)格式进行逼近,并获得了若干误差估计。最后,通过一些二维数值实验验证了这些估计。

英文摘要:

The stationary Navier-Stokes equations for a non-Newtonian incompressible fluid are coupled with the stationary heat equation and subject to Dirichlet type boundary conditions. The viscosity is supposed to depend on the temperature and the stress depends on the strain through a suit-able power law depending on $p \in (1,2)$ (shear thinning case). For this problem we establish the existence of a weak solution as well as we prove some regularity results both for the Navier-Stokes and the Stokes cases. Then, the latter case with the Carreau power law is approximated through a FEM scheme and some error estimates are obtained. Such estimates are then validated through some two-dimensional numerical experiments.

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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