Some of the rdfs go very abruptly to 1, so you might want to try:
- increasing the cutoff
- using a bigger system
- doing a PBC correction as in http://dx.doi.org/10.1063/1.4742067

Another option is to
- add extra exclusion
- use a fudge factor for the 1-4 interactions
- adding a couple of special 1-4 interactions
for that I would split the rdfs in inter-molecular and intra-molecular
pairs and check if the parts agree to the atomistic case separately.

Christoph

2016-09-18 3:10 GMT-06:00 Zidan Zhang <zhangzi...@gmail.com>:
> The possible reason of mistaken the exclusions can be ignored, I have
> already checked!
>
>
> On Sunday, 18 September 2016 11:07:09 UTC+2, Zidan Zhang wrote:
>>
>> Dear All,
>> As shown in enclosed material, I prepared a monomer system and a
>> coresponding decamer system. For the coarse-grained level, I made the
>> solvent implicit, and using three-beads mapping scheme for each structural
>> unit. The IBI for monomer system and for bonded interactions of decamer
>> system works well, but for the nonbonded interactions of decamer, all
>> interactions have deviations from their atomistic targets.
>> I have tried:
>> 1. using different initial CG configuration;
>> 2. change the temperature to modify the initial guess of the potential;
>> 3. scale factor during the iteration;
>> 4. a five-beads mapping scheme.
>> All of these couldn't solve the problem, for some cases listed above, the
>> decamers in the box get phase separation.
>> Any suggestions? Thank you very much!
>>
>> Best regards,
>> Zidan
>>
>>
>>
>>
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-- 
Christoph Junghans
Web: http://www.compphys.de

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