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June  2010, 3(2): 141-157. doi: 10.3934/dcdss.2010.3.141

Nonstationary Stokes system with variable viscosity in bounded and unbounded domains

Helmut Abels 1,

1. 

NWF I - Mathematik, Universität Regensburg, D-93040 Regensburg, Germany

Received  February 2009 Revised  May 2009 Published  April 2010

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 $L^q$-Sobolev spaces, in particular for an exterior force $f\in L^q(Q_T)$. Moreover, we characterize the domains of fractional powers of some associated Stokes operators $A_q$ and obtain a corresponding result for $f\in L^q(0,T;\mathcal{D}(A_q^\alpha))$. The result holds for a general class of domains including bounded domain, exterior domains, aperture domains, infinite cylinder and asymptotically flat layer with $W^{2-\frac1r}_r$-boundary for some $r>d$ with $r\geq \max(q,q')$.
Keywords: Stokes equation, Stokes operator, domains of fractional powers., unbounded domains, maximal regularity.
Mathematics Subject Classification: Primary: 76D07, 35Q30; Secondary: 47F0.
Citation: Helmut Abels. Nonstationary Stokes system with variable viscosity in bounded and unbounded domains. Discrete & Continuous Dynamical Systems - S, 2010, 3 (2) : 141-157. doi: 10.3934/dcdss.2010.3.141
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