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arXiv 1009.0249math.AP
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关于Oldrophil-B及相关复杂流体模型的注记

Remarks on Oldroyd-B and Related Complex Fluids Models

Peter Constantin, Weiran Sun

摘要:

我们证明了整体存在性和唯一性的Oldroup-B系统的$\Rr^d$中的相对较小的数据,在一个大的功能设置($C^α\cap L^1$)。这是一个稳定性结果,解选择一个平衡点并指数收敛到它。如果密度和应力的$L^{\infty}$范数足够小,则允许初始密度和应力的大的空间导数。我们证明了大数据的模型,其中潜在的流体中的高应变率的全球规律性。我们还证明了全球存在的一类大数据的教学标量模型,试图以最简单的方式捕捉的本质的耗散性质的耦合到流体。后一种模型在函数空间中具有意想不到的锥不变性,这对全局存在性至关重要。

英文摘要:

We prove global existence and uniqueness of solutions of Oldroyd-B systems with relatively small data in $\Rr^d$, in a large functional setting ($C^α\cap L^1$). This is a stability result, solutions select an equilibrium and converge exponentially to it. Large spatial derivatives of the initial density and stress are allowed, provided the $L^{\infty}$ norm of the density and stress are small enough. We prove global regularity for large data for a model in which the potential responds to high rates of strain in the fluid. We also prove global existence for a class of large data for a didactic scalar model which attempts to capture in the simplest way the essence of the dissipative nature of the coupling to fluid. This latter model has an unexpected cone invariance in function space that is crucial for the global existence.

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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