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arXiv 1203.6799math.AP
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一类粘性流体问题解存在性的注记

A note about existence for a class of viscous fluid problems

Hermenegildo Borges de Oliveira

摘要:

研究了一类非牛顿粘性流体问题的弱解的存在性。该问题由广义斯托克斯方程的稳态情况建模,其中表征流动的指数$q$取决于空间变量:$q=q(\mathbf{x})$。对于相关的边值问题,我们证明了在某些情况下,$q$上的log-Hölder连续性条件可以被抛弃,并且弱解的存在性结果对任何变指数$q\geqα>\frac{2N}{N+2}$仍然有效,其中$α=\mathrm{ess}\inf q$ .

英文摘要:

In this work the existence of weak solutions for a class of non-Newtonian viscous fluid problems is analyzed. The problem is modeled by the steady case of the generalized Navier-Stokes equations, where the exponent $q$ that characterizes the flow depends on the space variable: $q=q(\mathbf{x})$. For the associated boundary-value problem we show that, in some situations, the log-Hölder continuity condition on $q$ can be dropped and the result of the existence of weak solutions still remain valid for any variable exponent $q\geqα>\frac{2N}{N+2}$, where $α=\mathrm{ess}\inf q$.

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