What is the element Velocities after the collision when attachment occurs?

Fatemeh Hosseini_22198
Fatemeh Hosseini_22198 Altair Community Member
edited August 2023 in Community Q&A

Hello everybody,
I have the number of particles in a Fluid (CFD-DEM). I used HM-JKR as a contact force and I saw a lot of agglomerates in the tube. I tried to see the X, Y, and Z elements of two particles' velocities after the collision by EDEMpy. I expect that after collision those particles which attach have the same velocity but when I compare the two vectors, I can't find equal numbers in 2 vectors. (for example Vx for element A and Vx for element B). Could you please guide me on this issue?
The Excel file of the velocity vector has been attached.

Regards,
Fatemeh

 

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Answers

  • Stephen Cole
    Stephen Cole
    Altair Employee
    edited August 2023

    Hi Fatemeh,

     

    The collision velocity is the surface velocity of the particles contact point at the collision time, so this isn't going to be equal especially when taking into account any angular velocity.

    Also it's important to note the collision data is only written out when the collision ends, so if there is an agglomerate you can see the contact info at any point in time but the collision data won't be shown until the collision ends and the particles are no longer in contact.

    Regards

    Stephen 

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