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As we have previously pointed out the final porosity of the packing
depends on the PSD and on the value of friction we introduce as input values.
In my case I am using the expansion method but I see that whether I type a
value of compactionFrictionDeg let's say equal to that one of the spheres or a
value equal to zero, the final porosity doesn't modify.
Is that correct or I
should expect a change?