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DEM collision model parameters

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Old   January 5, 2021, 10:59
Default DEM collision model parameters
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Wim Kleermaker
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Hello everyone,

Currently, I am working on a project related to the numerical estimation of erosion in a centrifugal dredge pump. Since the volume fraction of the sand in this problem is between 0.01 and 0.1, I intended to use a four-way coupled (fluid-solid, solid-fluid, particle-wall, particle-particle) Eulerian-Lagrangian model as implemented in ANSYS Fluent (DPM model).

For the collisions I want to use the DEM collision model, more specifically the linear spring-dashpot model with friction. For this model, a number of parameters have to be specified, including the coefficient of restitution, the friction coefficients (mu_stick, mu_glide and mu_limit) and characteristic velocities (v_glide, v_limit and slope_limit). Since there is no description in Fluent’s theory or user’s guide how to determine these parameters, I was wondering if anyone knows how to find the values for these parameters?

Thanks in advance,
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Old   January 18, 2021, 08:00
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you can search for them in the relevant literature
but in my case I had to select most of these parameters empirically based on physical experiments
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Old   January 21, 2021, 09:30
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Wim Kleermaker
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Hey sfn,

Thanks for your reply!

On what kind of experiments did you base the values of these parameters?

Kind regards,
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collision, dem, dpm, erosion, restitution

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