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[Daizong Meng <question703948@xxxxxxxxxxxxxxxxxxxxx>]

Question #703948 on Yade changed:
https://answers.launchpad.net/yade/+question/703948

    Status: Needs information => Open

Daizong Meng gave more information on the question:
Hi Jan,

>>For density, jduriez's answer is helpful for me  but like he said

Mass density is stored in
b.mat.density # with b a Body and I also need to manually update mass.

I want to know how to alter it with time step. I would highly appreciate
it if you can write  a small piece of code or give me a related example
to show how to achieve that.

>> Drag coefficient is used to calculate the drag force, a kind of fluid
force on the particles. You can find the in the description of
HydroForceEngine from https://yade-dem.org/doc/Yade.pdf, page 360-361.
it is influenced by the roughness of particle.

Roughness is expressed as eps(=0.00001) defined as a fraction of
particles size in the Yade document https://yade-dem.org/doc/Yade.pdf.
that is what I mean for k/d because d is the size of particle and for
sphere it is diameter (d).

For surface-covering ratio, you can image a sphere that part of its
surface is smooth and part is rough and surface-covering ratio is rough
surface area/total surface area.

I want to control the variation of roughness over time based on the
surface-covering ratio. I mean there is a kind of material attached to
the sphere and this process change with time. In this process, for the
rough part surface the eps is a constant but the surface-covering ratio
increases, i.e. rough surface area increases. However, I did not find
the definition of surface-covering ratio in Yade document.  Do you know
some related expression of that?

Because roughness can influence the drag coefficient so I want to set
drag coefficient directly and let it change with time. Can you give me
some coding inspiration?

Sincerely,

DZ

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