EDEM question

Anas Alhatim
Anas Alhatim Altair Community Member
edited October 12 in Community Q&A

Hello Sir/Madam

I have a question about EDEM simulation and would appreciate if you answer it.

As a part of project, I have to simulate the detachment of olive fruit from tree branch by a shaking harvester. I have the CAD geometry of shaker which gets in contact to the branch and shake it to drop the fruit.

Could you please give me some hints on how to simulate the tree model? I know that it should be produced by a series of particles but am not sure how to bond them to form a rigid solid tree. I am thinking about linear elastic or linear cohesion v2 models but not sure.

In addition, could you please explain about the connection of fruit to branch? Is bonding v2 model suitable for this?

Thanks in advance for your response.

Regards 
Anas

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Answers

  • jerrinjobs
    jerrinjobs
    Altair Employee
    edited October 10

    Hi Anas

    I think this tutorial would be helpful for you: https://community.altair.com/community/en/edem-tutorial-8-flexible-particles?id=kb_article&sysparm_article=KB0037194

    Thanks,
    Jerrin Job

  • Anas Alhatim
    Anas Alhatim Altair Community Member
    edited October 11
    Hello Jerrin

    Thanks for your answer,

    Can I use both binding v2 model and linear elastic model at the same time for a simulation?

    Regards - Anas

  • jerrinjobs
    jerrinjobs
    Altair Employee
    edited October 11
    Anas Alhatim said:

    Hello Jerrin

    Thanks for your answer,

    Can I use both binding v2 model and linear elastic model at the same time for a simulation?

    Regards - Anas

    Hi Anas

    Unfortunately, I do not think that is possible! It would have to be one or the other.

  • Eric Veikle_22252
    Eric Veikle_22252
    Altair Employee
    edited October 11
    Jerrin Job Sibychan said:

    Hi Anas

    Unfortunately, I do not think that is possible! It would have to be one or the other.

    Hi Anas,

    I would suggest using the Bonding V2 model to form the tree, and bond the olives to the tree.  You mention a rigid solid tree - just to be sure you want to model a tree that can deform / move or you want it fixed with no movement?  If you want it to move under load then bond model is the way to go.  If you want a fixed tree that does not deform under load then you could create a multi-sphere particle that approximately match the shape of the tree.

    Hope this helps! 
    Let us know if you need further guidance!

    Kind Regards,

    Eric

  • Anas Alhatim
    Anas Alhatim Altair Community Member
    edited October 12
    Hello Eric,

    Thanks for your answer. Actually I want to model the tree including a trunk and branch in a way that to be rigid and fragile and the branch has elastic resilient like in actual case when the shaker machine contact the branch and shake it. This shaking movement imposes a force that is higher than the attachment force of fruit to branch and causes to detach the fruit.

    So if I want to produce the whole model including trunk, branch and fruit with sphere particles, you mean I should define a contact radius for the whole sphere particles and then bond them together with binding v2 model?

    Actually I have tried this process before and when the shaker contact the branch, the fruit is detached but the whole branch particles (spheres) are also separated from each other, which is not consistent with reality in which the branch is a rigid body.

    I believe the branch should behave like a fixed end support beam which is free from another end and has a movement.

    I attached to figure from EDEM simulation for ear detachment and maize harvesting simulations. In both cases, the body stands static and the machine cut the fruit. I think this is exactly what I need for my simulation case. The tree stands static and shaker machine vibrates the branch until the fruit is detached.

    Thanks again for your time and appreciate your hints.

    Regards - Anas

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