KINETIC ROUGHENING IN FIBER DEPOSITION

We consider the kinetic roughening of growing interfaces in a simple m odel of fiber deposition [K. J. Niskanen and M. J. Alava, Phys. Rev. L ett. 73, 3475 (1994)]. Fibers of length Li are deposited randomly on a lattice and upon deposition allowed to bend down locally by a distanc e determined by the flexibility parameter T-f. For Tf < infinity overh angs are allowed and pores develop in the bulk of the deposit, which l eads to kinetic roughening of the growing surface. We have numerically determined the asymptotic scaling exponents for a one-dimensional ver sion of the model and :find that they are compatible with the Kardar-P arisi-Zhang equation. We study in detail the dependence of the tilt-de pendent growth velocity on T-f and develop analytic arguments to expla in the simulation results in the limit of small and large tilts.