  The dynamics of the Broad Line Region (BLR) in Active galaxies is an open
question, direct observational constraints suggests a predominantly Keplerian
motion, with possible traces of inflow or outflow. In this paper we study in
detail the physically motivated BLR model of (Czerny, 2011) based on the
radiation pressure acting on dust at the surface layers of accretion disk (AD).
We consider here the realistic prescription of radiation coming from the entire
AD acting on a dusty cloud. We use here the realistic description of the dust
opacity, and we introduce two simple geometrical models of the local shielding
of the dusty cloud. We show that the radiation pressure acting on dusty clouds
is strong enough to lead to dynamical outflow from the AD surface, so the BLR
has a dynamical character of (mostly failed) outflow. The dynamics strongly
depend on the Eddington ratio of the source. Large Eddington ratio sources show
a complex velocity field and large vertical velocities with respect to the AD
surface, while for lower Eddington ratio sources vertical velocities are small
and most of the emission originates close to the AD surface. Cloud dynamics
thus determines the 3-D geometry of the BLR.
