Hello Hossein,
I don't know. We would have to ask a developer and compare the contact routines (SMP vs MPP).
If you intend to use MPP, I recommend you build, calibrate, and validate your model with MPP and stick to the same number of cores. For example, always use 32 cores with this model.
For the negative volume problem, you need to troubleshoot it with MPP. Please create a new post if you need help with negative volume error.
Reno.
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