MPM volume gain during simulation

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Hi,
I was trying to use the MPM solver to simulate sand/soil, but I found it's hard to keep the volume consistent. changing the grid scale to 1 can help but it will make the simulation much slower.
Is there a better solution or it need some solver level change?

Thanks,
Nan
Edited by Nan Guo - Dec. 4, 2025 00:12:26

Attachments:
MPM_volumeIssue.hiplc (385.2 KB)
Recording 2025-12-04 000913.gif (13.6 MB)

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