On the  slip with linear friction boundary
conditions for the Navier-Stokes equations

Luigi C. Berselli, Dept. of Applied Math.  University of Pisa, Via
Bonanno 25/b, I-56126 Pisa, ITALY.

We consider the Navier-Stokes equation with linear friction boundary
conditions and oscillating inflow. We prove existence of weak solutions
for rather general boundary data, by resorting to suitable energy type
estimates.