DEM collision model parameters

wim_1996 · January 5, 2021, 11:59

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,
Wim

sfn · January 18, 2021, 09:00

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

wim_1996 · January 21, 2021, 10:30

Hey sfn,

Thanks for your reply!

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

Kind regards,
Wim

January 5, 2021, 11:59	DEM collision model parameters	#1
wim_1996 New Member Wim Kleermaker Join Date: Jan 2021 Posts: 2 Rep Power: 0	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, Wim

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January 18, 2021, 09:00		#2
sfn New Member Alexander Join Date: Dec 2016 Posts: 24 Rep Power: 9	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

January 21, 2021, 10:30		#3
wim_1996 New Member Wim Kleermaker Join Date: Jan 2021 Posts: 2 Rep Power: 0	Hey sfn, Thanks for your reply! On what kind of experiments did you base the values of these parameters? Kind regards, Wim