Very weak solutions for the stationary Oseen and Navier-Stokes equations.
Résumé
We consider the stationary Oseen and Navier-Stokes equations in a bounded domain of class $C^{1,1}$ of $R^3$. Here we give a new and simpler proof of the existence of very weak solutions $(u, q) \in L^p(\Omega) × W^{−1,p}(\Omega)$ corresponding to boundary data in $W^{−1/p,p}(\Gamma)$. These solutions are obtained without imposing smallness assumptions on the exterior forces. We also obtain regularity results in fractional Sobolev spaces.
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