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• W642585528 abstract "Transport mechanisms for different substances are vital for our understanding of many important phenomena. One class of transport systems is particle-laden flows. Wake flows behind bluff bodies are a flow class of great interest. They appear in many areas in nature and industry. One very simple geometrical case, however yielding highly complex flow patterns, is flow around circular cylinders. Even at very low Reynolds numbers the flow destabilize and the famous von Karman vortex shedding process is observed. The presence of an unsteady wake can significantly alter the transport of particles. The mechanisms of sedimentation and scour of sand or soil is of special engineering importance in the vicinity of offshore installations, wellheads, piles, sub-sea pipelines and anchor lines. It is vital to be certain that the installation of a pipeline does not trigger any scouring, as this might lead to long, free-hanging spans, in which the pipe might crack or burst due to the increased tension or fatigue damage due to vortex induced vibrations. In this work, the dynamics of solid, spherical particles in the laminar wake behind circular cylinders are studied numerically. The open-source CFD tool OpenFOAM has been used in order to simulate both the flow and the particles, which are treated as point-masses. In order to make sure that the numerical flow solution is suitable for the simulation of the wake, a detailed convergence study is conducted, with special focus on the far-field wake behind the cylinder. It was found that even for a simple 2D laminar case, about 500 000 grid cells were required in order to avoid excessive numerical diffusion of the vortices. The converged flow simulations was in general agreement with the references found. In order to test the particle simulation algorithm and the postprocessing of the data, some simulations of particles in elementary flows, such as potential flow around a circular cylinder or simple laminar shear flow was conducted as a first step. These simulations also displayed some of the particle dynamics, including the effect of the particle mass. The simulations of transient, viscous flow past a circular cylinder with particles were conducted for seven different particle densities, spanning from almost passive particles that is transported with the flow velocity to very heavy particles, that is barely affected by the flow at all due to their large inertia. It was found that the particles were repelled from the vortices, with increasing effect for heavier particles. Only the very lightest particles were observed in the vortex cores. For most of the cases the particle voids corresponded with the isolines for magnitude of vorticity. The lightest particles were also `captured' in the recirculating zone behind the cylinder, and these stayed there for a long time. Each time a vortex was shed from the cylinder, some particles were captured from this zone and transported away with the vortex. For the heavy particle cases, the outlet (wake) length of 60 cylinder diameters downstream of the cylinder was not enough to reach a state in which there were no significant change in the particle distributions. In further simulations this length should be increased." @default.
• W642585528 created "2016-06-24" @default.
• W642585528 creator A5005425537 @default.
• W642585528 date "2013-01-01" @default.
• W642585528 modified "2023-09-28" @default.
• W642585528 title "Numerical Simulations of Wake Flows with and without Discrete Particles" @default.
• W642585528 hasPublicationYear "2013" @default.
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