Reply To: Rock drilling

[Reno Genest]

Hello,

You need to tackle these problems one by one and troubleshoot. Ideally, you can reproduce the problem on a small and efficient model to run quickly and troubleshoot faster. You could try to use a coarser mesh and/or scale the size of the model to increase the timestep and run faster.

1. Try to fix the contact problem.
   • Try different contact types (*CONTACT_NODES_TO_SURFACE; *CONTACT_AUTOMATIC_NODES_TO_SURFACE, etc.). Use the node set of the SPG particles as the SURFA and the segment set of the drill surfaces as SURFB.
   • Change the SOFT option. Try SOFT=1 (best for SPG).
   • Increase the contact stiffness. Set SOFSCL=0.9
   • Decrease the bucket sort frequency to 1. Set BSORT=1
   • Refer to the presentation on contacts I sent you earlier.
   • This may require many trials and errors.
2. SPG is a particle method; there is no negative volume. Set ERODE=0 on *CONTROL_TIMESTEP to get rid of those messages. 
3. I don't know. Try to create a new post for this question.
4. You need a TIED contact between the SPG particles and the ring.

 

Reno.