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Very Weak Solutions of Stationary and Instationary Navier-Stokes Equations with Nonhomogeneous Data
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 of Evolution Equations – Springer Journals
Published: Jun 1, 2015
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