How to restrict particle rolling on simulation?

Mohamed Abdeldayem

To overcome the spherical shape of particle representation, the particle rolling in simulation is restricted. how can I restrict the particle rolling in the simulation

Prasad Avilala_20558

Hi Mohamed,

You can do this in a couple of ways

1) 2 spheres/Multisphere with an aspect ratio of 1.5, however, 2 sphere approach is much simpler and less computationally expensive comparatively.

2) define Rolling friction to be zero or Under the physics section click particle limits and the new browser will open as shown in this you can constrain particle rotational velocity

 

In either of the method, you should verify and take a decision that you achieved you're objective without losing accuracy or behavior

 

Thanks,

Prasad A

Eric Veikle_22252

Prasad Avilala_20558 said:

Hi Mohamed,

You can do this in a couple of ways

1) 2 spheres/Multisphere with an aspect ratio of 1.5, however, 2 sphere approach is much simpler and less computationally expensive comparatively.

2) define Rolling friction to be zero or Under the physics section click particle limits and the new browser will open as shown in this you can constrain particle rotational velocity

 

In either of the method, you should verify and take a decision that you achieved you're objective without losing accuracy or behavior

 

Thanks,

Prasad A

Hi Prasad,

Great Feedback, I certainly agree with your first point!  However, for the second point if Mohamed wants to limit the rolling of the particle then the rolling friction should be set to a value other than zero.  Normally the rolling friction is a calibrated material model input parameters that is adjusted so that the bulk behavior of the virtual material is matched to the physical material.  There are two different built-in rolling friction models that can be used in EDEM; Standard Rolling Friction, or Type C Rolling Friction.  Please have  a look at the help for a description of the two models.

Kind Regards,

Eric

Mohamed Abdeldayem

Prasad Avilala_20558 said:

Hi Mohamed,

You can do this in a couple of ways

1) 2 spheres/Multisphere with an aspect ratio of 1.5, however, 2 sphere approach is much simpler and less computationally expensive comparatively.

2) define Rolling friction to be zero or Under the physics section click particle limits and the new browser will open as shown in this you can constrain particle rotational velocity

 

In either of the method, you should verify and take a decision that you achieved you're objective without losing accuracy or behavior

 

Thanks,

Prasad A

Thank you for your reply

Prasad Avilala_20558

Mohamed Abdeldayem said:

Thank you for your reply

Hi Eric,

Thanks for the comments.

It was a typo, my intention is for angular velocity assign as zero in particle limits but I mentioned zero for rolling friction.

Hi Mohammad,

Point 2 is a special case to control the rolling friction. As Eric mentioned it may deviate calibration principle. these are certain options to control angular velocity. However, as mentioned you should verify the simulation behavior with physical behavior when exploring point 2 as an option.

In addition, EDEM has 2 rolling friction models

1) Standard rolling friction

2) Type C rolling friction

Please go through the documentation and chose the appropriate physics model.

 

 

 

Thanks,

Prasad A