A new point-locating algorithm under three-dimensional hybrid meshes

Kuang, Shibo; Yu, Aibing; Zong-shu, Zou

doi:10.1016/j.ijmultiphaseflow.2008.06.007

Cited by 34 publications

(20 citation statements)

References 31 publications

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“…Chu and Yu 54 integrated a 3-D DEM model into the commercial CFD package Fluent for the study of gas-solid flow through a bend. Kuang et al 55 developed a 3-D CFD-DEM model to study flow phenomena in pneumatic conveying. The model has been applied to the study of flow regimes in vertical pneumatic conveying.…”

Section: Introductionmentioning

confidence: 99%

Micromechanic modeling and analysis of the flow regimes in horizontal pneumatic conveying

Kuang

2011

AIChE Journal

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Pneumatic conveying is an important technology for industries to transport bulk materials from one location to another. Different flow regimes have been observed in such transportation processes, but the underlying fundamentals are not clear. This article presents a three-dimensional (3-D) numerical study of horizontal pneumatic conveying by a combined approach of discrete element model for particles and computational fluid dynamics for gas. This particle scale, micromechanic approach is verified by comparing the calculated and measured results in terms of particle flow pattern and gas pressure drop. It is shown that flow regimes usually encountered in horizontal pneumatic conveying, including slug flow, stratified flow, dispersed flow and transition flow between slug flow and stratified flow, and the corresponding phase diagram can be reproduced. The forces governing the behavior of particles, such as the particleparticle, particle-fluid and particle-wall forces, are then analyzed in detail. It is shown that the roles of these forces vary with flow regimes. A general phase diagram in terms of these forces is proposed to describe the flow regimes in horizontal pneumatic conveying.

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Section: Introductionmentioning

confidence: 99%

Micromechanic modeling and analysis of the flow regimes in horizontal pneumatic conveying

Kuang

2011

AIChE Journal

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“…Furthermore, we proposed a simple solution to the virtual gap problem that was addressed by Kuang et al (16), obtaining a very robust and efficient point-locating scheme. The particle tracking method is then implemented in an in-house finite-volume based CFD code for unstructured geometries.…”

Section: Discussionmentioning

confidence: 99%

“…volume elements that are not enclosed within any of the tetrahedra) can be created due to the decomposition, as observed in Kuang et al (16). However, this problem is easy to solve, as is explained in the next sections.…”

Section: Tetrahedral Decompositionmentioning

confidence: 96%

“…This renders a mesh only consisting of tetrahedra, which has the advantage that the host cells of the particles can be easily identified (Kenwright et al (11)). Kuang et al (16) mention that this method needs a sophisticated way of decomposing the cells and that it does not need to consider non-planarity of a grid. However, both these statements are not true.…”

Section: Tetrahedral Decompositionmentioning

confidence: 99%

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An efficient and robust method for Lagrangian magnetic particle tracking in fluid flow simulations on unstructured grids

2011

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In this paper we report on a newly developed particle tracking scheme for fluid flow simulations on 3D unstructured grids, aiming to provide detailed insights in the particle behaviour in complex geometries. A possible field of applications is the Magnetic Drug Targeting (MDT) technique, on which this paper will be focused. MDT is a promising medical technique that uses locally applied magnetic fields to capture magnetic drug carriers at the desired locations in the human body, strongly increasing the efficiency of medical drugs. The new particle tracking scheme combines the advantages of existing methods and is easy for implementation in a generic numerical code.The scheme is tested and validated for simple MDT cases that include effects of a non-homogeneous magnetic field on deposition of magnetic particles in laminar flow. The first test case is a validation study of the magnetic particle trajectories released in a horizontal circular pipe flow with a current- * Corresponding author Email address: S.Kenjeres@tudelft.nl (S. Kenjereš) Preprint submitted to Computers & Fluids September 1, 2010carrying wire parallel to the flow, for which analytical solutions are reported in literature. The second test case involves particle capture efficiencies in a 90 o bent tube for different configurations of the imposed magnetic field.This configuration corresponds more closely to the conditions inside blood vessels, because of the presence of secondary motions. These results are compared with numerical studies from literature too. The obtained results demonstrate that the developed particle tracking scheme is a very robust, efficient and accurate method, which can give detailed insights in particle behaviour in complex geometries. As such it is a good candidate for future applications and optimisations of MDT technique for loco-regional cancer treatment or treatment of cardiovascular diseases.

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“…The method of interest here follows from work by Haselbacher et al (2007), Kuang et al (2008) and Macpherson et al (2009) simultaneously in a single step has escaped attention, with methods tacitly assuming this would not be worthwhile. Different work by Nielson and Jung (1999), and later Kipfer et al (2003) explored using local analytical integration, which was then combined with face intersection to give points along the trajectory.…”

Section: Droplet Trajectoriesmentioning

confidence: 99%

Finite-volume droplet trajectories for icing simulation

Rendall

Allen

2014

International Journal of Multiphase Flow

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During a Lagrangian icing simulation a large number of droplet trajectories are calculated to determine the water catch, and as a result it is important that this procedure is as rapid as possible. In order to arrive at a method with minimum complexity, a finite volume representation is developed for streamlines and extended to incorporate the equations of motion for a droplet, with all cells being crossed in a single timestep.However, since cells vary greatly in size, the method must be implicit to avoid an awkward stability restriction that would otherwise degrade performance. An implicit method is therefore implemented by carrying out iterations to solve for the crossing of each CFD cell, so that the droplet motion is tightly coupled to the underlying flow and mesh. By crossing every cell in a single step, and by using the mesh connectivity to track the droplet motion between cells, any need for costly searches or containment checks is eliminated and the resulting method is efficient. The implicit system is solved using functional iteration, which is feasible for the droplet system (which can be stiff) by using a particular factorisation. Stability of this iteration is explored and seen to depend primarily on the maximum power used in the empirical relationship for droplet drag coefficient C D = C D (R e ), while numerical tests confirm the theoretical orders of accuracy for the different discretisations. Final results are validated against experimental and alternative numerical water catch data for a NACA 23012 aerofoil.

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A new point-locating algorithm under three-dimensional hybrid meshes

Cited by 34 publications

References 31 publications

Micromechanic modeling and analysis of the flow regimes in horizontal pneumatic conveying

Micromechanic modeling and analysis of the flow regimes in horizontal pneumatic conveying

An efficient and robust method for Lagrangian magnetic particle tracking in fluid flow simulations on unstructured grids

Finite-volume droplet trajectories for icing simulation

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