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How to fix the velocity of selected particles while preparing straw so that it act as base of straw?

I am working on the modeling of rice straws for impact cutting. To accomplish this it is required to keep the straw in a standing position. I want particle velocity and the position of a few bottom particles should be fixed so that they will stand firmly during impact cutting. Is there any way to do this in EDEM?

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EDEM

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v2022

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jpmorr

If you want to fix the position and velocity of a subset of particles you can do this via a custom particle body force model. You could specify a unique particle type for those to be fixed and then set velocity and angular velocity to be zero for those specific particles in the body force model.

This works quite well and I've used previously for setting end constraints on beams.

Stephen Cole

Hi, just to add there is actually now a new in-built feature to EDEM which replicates the custom model JP mentions. Under Particle>Properties you can choose 'fixed velocity' which means the particle gets generated with a velocity set by the factory (which can be 0 m/s) and if fixed velocity is selected the particle velocity never changes from it's generated value regardless of the forces on it. This was designed to help to create a base for cutting particles.

We have an e-learning lesson which includes this feature (lesson 4.4):

https://learn.altair.com/course/view.php?id=147&section=4

Community-Pasted-Attachment-1665411319349.png

jpmorr

Hi, just to add there is actually now a new in-built feature to EDEM which replicates the custom model JP mentions. Under Particle>Properties you can choose 'fixed velocity' which means the particle gets generated with a velocity set by the factory (which can be 0 m/s) and if fixed velocity is selected the particle velocity never changes from it's generated value regardless of the forces on it. This was designed to help to create a base for cutting particles.

We have an e-learning lesson which includes this feature (lesson 4.4):

https://learn.altair.com/course/view.php?id=147&section=4

Thanks Stephen, realy useful to know this is now inbuilt. Missed that!