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[Guilherme das Neves Seguro <question691351@xxxxxxxxxxxxxxxxxxxxx>]

Question #691351 on Yade changed:
https://answers.launchpad.net/yade/+question/691351

Guilherme das Neves Seguro posted a new comment:
Hello mr Scholtès;

> You want to measure the permeability of a fracture contained inside a
"rock" sample and, for that, you want to relate the flux inside the
fracture to the pressure difference along its extension. Am I right?

Yes, exactly. Also all 5 considerations you did were all correct.


> If all points above are right, your problem is the difference you get between Qin and Qout. 

Yes. That's the trouble I'm facing and got stuck.

> I think I (i.e., someone I worked with) experienced such problem
before and It may comes from the getBoundaryFlux() function and the way
it works. [...] To see if the problem is coming from the
getBoundaryFlux() function, you could check the flow velocity (or the
flux) at different points located inside the fracture. If the velocity
is the same everywhere, you could even use it to compute the
permeability of your fracture without using the Qin and Qout.

About measuring the velocity on different points of the fracture should
I use averageVelocity() or is there any other more suitable function for
this purpose?

> Instead, you should look into the cubic law [1]

Thanks for this, I'll read the work and change it on the code. Thanks
for all others advices as well, I'm gonna try all the suggestions.

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