We present 3D gasdynamical simulations of the interaction of neutral clumps with an impinging external wind+ionizing photon field. In agreement with previous clump/wind interaction models, we show that very weak ionizing photon fields lead to the fragmentation of the clump. On the other hand, stronger ionizing photon fields reduce this fragmentation.

In addition, we present numerical models of the interaction of nonuniform neutral clumps with an external ionizing photon flux, where we show that the clumps develop multiple condensations as the time evolution proceeds.