Question #665293 on Yade changed:
https://answers.launchpad.net/yade/+question/665293

Jérôme Duriez proposed the following answer:
Regarding your questions in post #2:

1.
For a narrow psd I guess rRatioVec includes enough values close to 1 to have 
"good" results, but I never really looked into this.
If you wish, you have MATLAB files in #4 of 
https://bugs.launchpad.net/yade/+bug/1440887 that could help you dig into the 
capillary files data (plotting them) and check how critical a change in rRatio 
is.

3.
It is exactly "to define a comprehensive lookup table [..] to be used with 
several user-set capillary pressures"

4.
You may consider there is a limit through the maximum capillary pressure which 
appears in the capillary files. This maximum value (in the normalized fashion) 
is automatically computed by the MATLAB scripts in "Preliminary C" [*]

If you would impose an even greater value in 
Law2_ScGeom_CapillaryPhys_Capillarity during your YADE simulations, including 
Law2_ScGeom_CapillaryPhys_Capillarity would go unnoticed : no capillary bridges 
would be computed because you're outside the bounds of the lookup table.
You would get a corresponding warning message in your YADE terminal during 
simulation.

This corresponds neglecting so tiny bridges we may consider this is not
a problem (even though this may not be true because capillary force has
a non zero limit value when the bridge volume tends to zero)


Regarding your question in #4, the value of 
Law2_ScGeom_CapillaryPhys_Capillarity.capillaryPressure also has to ensure a 
pendular regime with distinct bridges. 
You may check whether bridges are distinct or overlap with 
Law2_ScGeom_CapillaryPhys_Capillarity.fusionDetection and 
CapillaryPhys.fusionNumber


[*]
https://github.com/yade/trunk/blob/master/examples/capillaryLaplaceYoung/writesCapFile.m#L84

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