I suspect the fact you're using a CFF for volume fraction means the particles don't actually exist in the continuous phase as a volume. Looking at the Theory Guide I suspect something else is done (it's good bedtime reading) so you may find that you either check it's not already defined in the CFF list or need to create another CFF of (1- mpm-volume-fraction).
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New Post - Reply To: A volume fraction of particles by using MPM technique