Journal article
Modeling collisions of arbitrary-shaped particles in simulations of particulate flows
Powder technology, Vol.344, pp.756-772
02/15/2019
DOI: 10.1016/j.powtec.2018.12.062
Abstract
Simulations of dense suspensions containing arbitrary-shaped particles must deal with particle collision models. This paper deals with the wet collisional interactions between particles in a carrier fluid, in the context of immersed boundary treatment of fully resolved particles. When collisions of non-spherical particles occur, several parameters that govern collisional mechanics are challenging to obtain: these include collision point, normal and tangential forces, degree of overlapping between particles, the local relative velocity and the local curvatures at the collision point. These challenges are overcome in this paper by defining a field variable, i.e. a distance function that describes the particle on a regular Cartesian grid. A Simplified Spring Collision Method (SSCM) is proposed to model wet collision forces. The Stokes number at the collision point is computed from the particle's relative velocities and local curvatures and is used to calculate the restitution coefficient; damping is incorporated into the model by modifying the restitution coefficient when the rebound phase starts. The methods are validated against experiments and other benchmarks and shown to provide good results over a wide range of Stokes numbers. The capability of the method is also tested successfully for non-circular particle shapes.
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•A collision model for resolved collision of arbitrary shape particles is proposed.•The collision parameters i.e. contact point, force, … were calculated using the level-set field.•A spring system with no dashpot or lubrication model applies the collision force.•Collision forces are applied without creating stiff numerical schemes.
Details
- Title: Subtitle
- Modeling collisions of arbitrary-shaped particles in simulations of particulate flows
- Creators
- Fazlolah MohagheghH.S Udaykumar
- Resource Type
- Journal article
- Publication Details
- Powder technology, Vol.344, pp.756-772
- DOI
- 10.1016/j.powtec.2018.12.062
- ISSN
- 0032-5910
- eISSN
- 1873-328X
- Publisher
- Elsevier B.V
- Language
- English
- Date published
- 02/15/2019
- Academic Unit
- Injury Prevention Research Center; Mechanical Engineering
- Record Identifier
- 9984121964802771
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