GROWTH AND FORM OF 2-DIMENSIONAL ROTATING AGGREGATES

We propose a two-dimensional particle-cluster aggregation model which considers explicitly linear and angular momentum conservation. Each ag gregate is grown from a seed of given mass and given initial angular v elocity, to which particles of unitary mass and ballistic trajectories are added. The fractal dimensions of the resulting aggregates are cal culated and Fourier transform analysis is performed. Very different fe atures are found, as initial conditions are varied. Particularly, spir al structures are found for a seed of high mass and high initial angul ar velocity.