Size distribution in gengeo

Asked by René Gómez Puigpinos on 2018-08-30

Hello,

Is it considered in future upgrades of GenGeo to incorporate particle size distribution?

King regards,

René GP.

Question information

Language:
English Edit question
Status:
Answered
For:
ESyS-Particle Edit question
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Last query:
2018-08-30
Last reply:
2018-08-30
Dion Weatherley (d-weatherley) said : #1

Hi Rene,

We don't have plans at this stage to add capacity to specify a particle size distribution in GenGeo.

The core algorithm of GenGeo is a space-filling sphere packing algorithm that has been optimised to permit construction of particle assemblies of quite complex, arbitrary geometry. To ensure that adjacent particles are touching one-another, it is not (to my knowledge) possible to select particles sizes from a prescribed size-distribution.

Typically authors wishing to construct particle assemblies with a prescribed size distribution will execute some form of initialisation simulation wherein the particles are loosely inserted into the simulation domain then allowed to settle or compacted as required. It is common to use numerical "tricks" to accelerate such simulations e.g. very high particle densities or soft contacts with large damping coefficients. Either approach allows use of an unrealistically large timestep increment to reduce the total number of timesteps to be computed. Generally the method of initialising the particle assembly depends on the specific application of interest and careful parameter tuning is required to achieve an acceptable initial particle assembly. Such initialisation methods can be simulated using ESyS-Particle but it is not easy to envisage a tool (like GenGeo) that can cover all the possible starting configurations users may require.

I hope this helps.

Cheers,

Dion

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