Sat, 26 Jul 2008 07:23:50 BST CiteULike: matthewhflamm's dla http://www.citeulike.org/user/matthewhflamm/tag/dla CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/matthewhflamm/article/2599439 <i>International Journal of Modern Physics C: Computational Physics & Physical Computation, Vol. 14, No. 9. (November 2003), pp. 1171-1182.</i><br /><br />In the diffusion-limited aggregation (DLA) model, pioneered by Witten and Sander (Phys. Rev. Lett.47, 1400 (1981)), diffusing particles irreversibly attach to a growing cluster which is initiated with a single solid seed. This process generates clusters with a branched morphology. Advection–diffusion-limited aggregation (ADLA) is a straightforward extension to this model, where the transport of the aggregating particles not only depends on diffusion, but also on a fluid flow. The authors studying two-dimensional and three-dimensional ADLA in laminar flows reported that clusters grow preferentially against the flow direction. The internal structure of the clusters was mostly reported to remain unaffected, except by Kaandorp et al. (Phys. Rev. Lett.77, 2328 (1996)) who found compact clusters "as the flow becomes more important". In the present paper we present three-dimensional simulations of ADLA. We did not find significant effects of low Reynolds-number advection on the cluster structure. The contradicting results by Kaandorp et al. (1996) were recovered only when the relaxation into equilibrium of the advection–diffusion field was too slow, in combination with the synchronous addition of multiple particles. DIFFUSION-LIMITED AGGREGATION IN LAMINAR FLOWS RMH Merks AG Hoekstra JA Kaandorp PMA Sloot International Journal of Modern Physics C: Computational Physics & Physical Computation, Vol. 14, No. 9. (November 2003), pp. 1171-1182. 2008-03-26T18:25:32-00:00 2003 International Journal of Modern Physics C: Computational Physics & Physical Computation 14 9 1171 1182 dla flow http://www.citeulike.org/user/matthewhflamm/article/2599420 <i>Physical Review A, Vol. 43, No. 6. (15 March 1991), 2970.</i><br /><br />The effect of hydrodynamic flow upon diffusion-limited deposition on a line is investigated using a Monte Carlo model. The growth process is governed by the convection and diffusion field. The convective diffusion field is simulated by the biased-random walker resulting from a superimposed drift that represents the convective flow. The development of distinct morphologies is found with varying direction and strength of drift. By introducing a horizontal drift parallel to the deposition plate; the diffusion-limited deposit changes into a single needle inclined to the plate. The width of the needle decreases with increasing strength of drift. The angle between the needle and the plate is about 45° at high flow rate. In the presence of an inclined drift to the plate; the convection-diffusion-limited deposit leads to the formation of a characteristic columnar morphology. In the limiting case where the convection dominates; the deposition process is equivalent to ballistic deposition onto an inclined surface. Morphological changes in convection-diffusion-limited deposition Takashi Nagatani Francesc Sagués doi:10.1103/PhysRevA.43.2970 Physical Review A, Vol. 43, No. 6. (15 March 1991), 2970. 2008-03-26T18:17:10-00:00 1991 Physical Review A 43 6 2970 American Physical Society convection dla dld