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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

>  
> My Question:
> >>By radius expansion method particle radius increased until to desire 
> mean pressure ...where Minimum density state obtained.
I'm sorry, I don't understand this question.


> >>What about the REFD(Radius Expansion Friction Decrease) that was 
> implemented for Maximum density?In REFD friction reaches to zero 
> maintaining the desired mean pressure.When particle generated with 
> high porosity and when REFD implemented---what are the difference?For 
> more specific I want to know REFD and its Implementation.
>  

REFD :

contact_friction = friction_initial;
while (porosity > porosity0)
{
      contact_friction *= 0.99999; //or anything lower but close to 1
      keep stress constant;
      run a few cycles;
}
contact_friction = friction_final;// recommended at that point : 
contact_friction < friction_final, or the sample will be unstable.

This method can give you many different density values, depending on 
friction_initial and porosity0.

Bruno





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