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Very weak solutions to the Navier–Stokes system in general unbounded domains

Very weak solutions to the Navier–Stokes system in general unbounded domains We consider very weak instationary solutions u of the Navier–Stokes system in general unbounded domains $${\Omega \subset \mathbb{R}^n}$$ Ω ⊂ R n , $${n \geq 3}$$ n ≥ 3 , with smooth boundary, i.e., u solves the Navier–Stokes system in the sense of distributions and $${ u \in L^r (0,T;\tilde{L}^q(\Omega))}$$ u ∈ L r ( 0 , T ; L ~ q ( Ω ) ) where $${\frac{2}{r} + \frac{n}{q} =1}$$ 2 r + n q = 1 , 2 < r < ∞. Solutions of this class have no differentiability properties and in general are not weak solutions in the sense of Leray–Hopf. However, they lie in the so-called Serrin class $${L^r(0,T;\tilde{L}^q(\Omega))}$$ L r ( 0 , T ; L ~ q ( Ω ) ) yielding uniqueness. To deal with the unboundedness of the domain, we work in the spaces $${\tilde{L}^q(\Omega)}$$ L ~ q ( Ω ) (instead of $${L^q(\Omega)}$$ L q ( Ω ) ) defined as $${L^q \cap L^2}$$ L q ∩ L 2 when $${q \geq 2}$$ q ≥ 2 but as L q + L 2 when 1 < q < 2. The proofs are strongly based on duality arguments and the properties of the spaces $${\tilde{L}^q(\Omega)}$$ L ~ q ( Ω ) . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Evolution Equations Springer Journals

Very weak solutions to the Navier–Stokes system in general unbounded domains

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References (33)

Publisher
Springer Journals
Copyright
Copyright © 2015 by Springer Basel
Subject
Mathematics; Analysis
ISSN
1424-3199
eISSN
1424-3202
DOI
10.1007/s00028-014-0258-y
Publisher site
See Article on Publisher Site

Abstract

We consider very weak instationary solutions u of the Navier–Stokes system in general unbounded domains $${\Omega \subset \mathbb{R}^n}$$ Ω ⊂ R n , $${n \geq 3}$$ n ≥ 3 , with smooth boundary, i.e., u solves the Navier–Stokes system in the sense of distributions and $${ u \in L^r (0,T;\tilde{L}^q(\Omega))}$$ u ∈ L r ( 0 , T ; L ~ q ( Ω ) ) where $${\frac{2}{r} + \frac{n}{q} =1}$$ 2 r + n q = 1 , 2 < r < ∞. Solutions of this class have no differentiability properties and in general are not weak solutions in the sense of Leray–Hopf. However, they lie in the so-called Serrin class $${L^r(0,T;\tilde{L}^q(\Omega))}$$ L r ( 0 , T ; L ~ q ( Ω ) ) yielding uniqueness. To deal with the unboundedness of the domain, we work in the spaces $${\tilde{L}^q(\Omega)}$$ L ~ q ( Ω ) (instead of $${L^q(\Omega)}$$ L q ( Ω ) ) defined as $${L^q \cap L^2}$$ L q ∩ L 2 when $${q \geq 2}$$ q ≥ 2 but as L q + L 2 when 1 < q < 2. The proofs are strongly based on duality arguments and the properties of the spaces $${\tilde{L}^q(\Omega)}$$ L ~ q ( Ω ) .

Journal

Journal of Evolution EquationsSpringer Journals

Published: Jun 1, 2015

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