Damping coefficient and contact duration relations for continuous nonlinear spring-dashpot contact model in DEM

The soft-sphere model design of the discrete element method is based on types of dynamic systems for determining the contact forces. These forces are computed considering the solution of equation of motion for the overlap between the particles during the contact. The dynamic systems can be modeled a...

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Bibliographic Details
Published in:Powder technology 2016-11, Vol.302, p.462-479
Main Authors: Jordam Caserta, Alice, Navarro, Hélio A., Cabezas-Gómez, Luben
Format: Article
Language:English
Subjects:
Bubbling
Computation
Computer applications
Computer simulation
Contact duration
Contact force
Continuous contact model
Damping
Damping coefficient
Discrete element method
Discrete element method (DEM)
Dynamical systems
Equations of motion
Fluidized beds
Particulates
Polymers
Powder metallurgy
Spring stiffness coefficient
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Summary:The soft-sphere model design of the discrete element method is based on types of dynamic systems for determining the contact forces. These forces are computed considering the solution of equation of motion for the overlap between the particles during the contact. The dynamic systems can be modeled as linear or nonlinear mass-spring-damper. In the present work we derive two new approximate relations for determining the damping coefficient and duration of contact for a specific non-linear soft-sphere contact model where the contact force is continuous at the start and end of the contact. The proposed relations are applied in three different problems: single freely falling particle, 3D bubbling fluidized bed and 3D hopper. All results are obtained using the MFIX computational code and are compared with literature data showing good agreement. In these simulations, when we compare the nonlinear contact force models, the proposed approximate relations reduced the computational time. This behavior is caused because the proposed contact model simulates better the contact process between particles. Relationships for damping coefficient and contact duration. [Display omitted] •It is proposed the use of a continuous damping force model for DEM simulations.•New relations for damping coefficient and contact duration are presented.•The continuous contact model is applied in gas-solid and granular flows.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2016.07.032