  With the motivation in mind to evaluate the contribution of the cosmological
constant $\Lambda$ on the foam like patterns formation process in the
distribution of galaxies, we investigate the Newtonian dynamics of a spherical
void embedded in an uniform medium which undergoes a Hubble expansion. We use a
covariant approach for deriving the evolution with time of the shell (S) acting
as a boundaries condition for the inside and outside media. As a result, with
the usual values for the cosmological parameters, S expands with a huge initial
burst that freezes up to matching Hubble flow. With respect to Friedmann
comoving frame, its magnification increases nonlinearly with $\Lambda$, with a
maximal growth rate at redshift $z\sim 1.7$. The velocity field inside S shows
an interesting feature which enables us to disentangle a spatially closed from
open universe. Namely, the void region are swept out in the first case, what
can be interpreted as a stability criterion.
