Lifting of a ball in a pressure driven Poiseuille flow

Lifting of a ball in a horizontal pipe of circular cross section containing an incompressible viscous fluid driven by pressure drop in the horizontal direction for 0 < t < 40.

The flow is periodic in the horizontal direction.
The dimension of computational domain = (0,1+4h)x(0,2)x(0,1+4h).
The initial position is at the bottom of the pipe.
The radius of the pipe = 0.5.
The radius of the ball = 0.1.
The density of tha ball = 1.001.
The density of fluid = 1.
The viscosity = 1.0
The mesh size for the velocity field = 1/96.
The mesh size for the pressure = 1/48.
The time step=0.001.
The pressure drop = 320 (so the maximal speed of the flow without the ball is 10).
The last five second averaged ball speed = 6.126 (after reaching stable height).
The last five second averaged particle Reynolds number = 1.2252
The stable distance (last five second) from the ball center to the central axis after lifting = 0.30129