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OPTIMAL ERROR ESTIMATES FOR A SEMI-IMPLICIT EULER SCHEME FOR INCOMPRESSIBLE FLUIDS WITH SHEAR DEPENDENT VISCOSITIES

机译:具有剪切相关粘度的不可压缩流体的半隐式EULER方案的最佳误差估计

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摘要

Certain rheological behaviors of fluids in engineering sciences are modeled by power law ansatz with p is an element of (1, 2]. In the present paper a semi-implicit time discretization scheme for such fluids is proposed. The main result is the optimal O(k) error estimate, where k is the time step size. Our results hold in the range p is an element of (3/2, 2] (in the three-dimensional setting) for strong solutions of the continuous problem, whose existence is guaranteed under appropriate assumptions on the data. The estimates are uniform with respect to the degeneracy parameter delta is an element of [0, delta(0)] of the extra stress tensor. Additional regularity properties of the solution of the discrete problem are proved.
机译:工程力学中某些流体的流变行为通过幂律ansatz建模,其中p是(1,2]的元素,本文提出了一种半隐式时间离散化方案,主要结果是最优O (k)误差估计,其中k是时间步长,我们的结果在p范围内,是连续问题的强解的(3/2,2](在三维环境中)的元素保证在适当的数据假设下,关于简并性参数的估计是均匀的,δ是额外应力张量的[0,delta(0)]元素,证明了离散问题解的其他正则性质。

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