Weak solutions for the Oseen system in 2D and when the given velocity is not sufficiently regular

Abstract The aim of this work is twofold: proving the existence of solution ( u , π ) ∈ H 1 ( Ω ) × L 2 ( Ω ) in bounded domains of R 2 and the whole plane for the Oseen problem ( O ) for solenoidal vector fields v in L 2 ( Ω ) , and analyzing the same problem in bounded domains of R n for n = 2 , 3 when h = 0 , g = 0 and the solenoidal field v belongs to L s ( Ω ) for s n .