

Preprint 12/2009
Nonstationary Stokes System with Variable Viscosity in Bounded and Unbounded Domains
Helmut Abels
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Submission date: 27. Feb. 2009 (revised version: March 2009)
Pages: 23
published in: Discrete and continuous dynamical systems / S, 3 (2010) 2, p. 141-157
DOI number (of the published article): 10.3934/dcdss.2010.3.141
Bibtex
MSC-Numbers: 35Q30, 76D07, 47F05
Keywords and phrases: Stokes equation, Stokes operator, unbounded domains, maximal regularity, domains of fractional powers
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Abstract:
We consider a generalization of the nonstationary Stokes system, where the
constant viscosity is replaced by a general given positive function. Such a system
arises in many situations as linearized system, when the viscosity of
an incompressible, viscous fluid depends on some other quantities.
We prove unique solvability of the nonstationary system with optimal regularity in -Sobolev spaces, in particular for an exterior force
. Moreover, we characterize the domains of fractional powers of some associated Stokes operators
and obtain a corresponding result for
.
The result holds for a general class of domains including bounded domain, exterior domains, aperture domains, infinite cylinder and asymptotically flat layer with
-boundary for some r>d with
.