# Aggregate formation in 3D turbulent-like flows

A. Dominguez, H.J.H. Clercx

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

## Abstract

Aggregate formation is an important process in industrial and environmental turbulent flows. In oceans turbulence play an important role on Marine Snow (aggregate) formation. For a proper description, the study of aggregate formation in turbulent flows requires a particle based model i.e. following trajectories of single particles. For these to be done, it is required to model three main processes: the flow, the motion of the particles and the encounter and coalescence of particles. In this study we use 3-D kinematic simulations to model the turbulent flow. A simplified version of the Maxey-Riley equation is used, with Stokes drag, bouyancy and added mass forces. In the collision and aggregate formation module a geometrical collision check is used. When the distance between two particles, is smaller than the sum of their radii, a collision takes place. All the particles that collide stay together to form an aggregate. To account for the porosity of the aggregates a Fractal Growth Model is used. In this study we will explore the effects of different parameters on the aggregate formation (\textit{e.g. St; Wst; $\phi$; Re}) and the effects of two different background populations: constant and decaying.
Original language English Proceedings of the 59th Annual Meeting of the APS Division of Fluid Dynamics, Tampa Bay, Florida, USA, November 19-21, 2006 Tampa Bay, USA American Physical Society Published - 2006 59th Annual Meeting of the APS Division of Fluid Dynamics (DFD06), November 19-21, 2006, Tampa Bay, FL, USA - University of Florida, Tampa Bay, FLDuration: 19 Nov 2006 → 21 Nov 2006http://www.aps.org/meetings/meeting.cfm?name=DFD06

### Conference

Conference 59th Annual Meeting of the APS Division of Fluid Dynamics (DFD06), November 19-21, 2006, Tampa Bay, FL, USA DFD06 Tampa Bay, FL 19/11/06 → 21/11/06 http://www.aps.org/meetings/meeting.cfm?name=DFD06