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[Robert Caulk <question632800@xxxxxxxxxxxxxxxxxxxxx>]

Question #632800 on Yade changed:
https://answers.launchpad.net/yade/+question/632800

    Status: Open => Answered

Robert Caulk proposed the following answer:
Hello Cheng,

>Which Viscosity is used in FlowEngine, dynamic viscosity or kinematic
viscosity?

FlowEngine computes flow between cells using Poiseuilles law [1], so it
is using the dynamic viscosity of the fluid.

>I know some parameter value is just for a test, but I am not sure
whether any parameters are using SI Unit.

YADE is (generally) unitless. You decide which units you want your
system to adhere to, and assuming you are consistent, your results will
remain in the system you have chosen. I did not author oedometer.py, but
most of these examples are just demonstrations of functionality, I
wouldn't take the numbers to mean anything special if I were you (but
maybe they do, without comments I guess you need to really inspect it to
find out what unit system it is in). Same goes for default values in
general, these are values that worked for someone's simulation but you
will need to change them to obtain accurate behavior in your specific
model.

>And how can I find the FlowEngine source codes.

YADE source code is hosted on Github. The FlowEngine itself is contained
in [2], but it relies on [3] and [4] for permeability calculations and
the solver.


[1]Chareyre, B., Cortis, A., Catalano, E., & Barthélemy, E. (2012). Pore-Scale Modeling of Viscous Flow and Induced Forces in Dense Sphere Packings. Transport in Porous Media, 94(2), 595–615. http://doi.org/10.1007/s11242-012-0057-2

[2]https://github.com/yade/trunk/blob/master/pkg/pfv/FlowEngine.ipp.in
[3]https://github.com/yade/trunk/blob/master/lib/triangulation/FlowBoundingSphere.ipp
[4]https://github.com/yade/trunk/blob/master/lib/triangulation/FlowBoundingSphereLinSolv.ipp

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