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Attendees

Discussion items

Dariel gives presentation.

Thomas' notes:

  • Segregation strength plot: would look better with x-axis log; should have segregation strength 0 at AR=1
  • Clarify labels 1=spheres 2=elongated
  • averaging region is very deep; data. like kinetic stress should not be averaged over inhomogeneous regions
  • density fraction: some asymmetry in x
  • Observation: spheres always have higher kinetic stress ratio (s_k^1/s_k) than 0.5, even higher than (rho^1/rho), ratio is increasing with more extreme AR. But: you are averaging over inhomogeneous region in z
  • d_z=1 characteristic axis perpendicular to surface, d_z increases with AZ more extreme
  • Ant notes upcoming paper comparing volume vs shape segregation, and paper with Mueller Christoph
  • A_eff: uses average angle, thus not accurate; better integrate over psd.

 

Goal of the paper:

  • First show that s_k^1/s_k>phi^1/phi independent of AR
  • Then show R_eff=f(AR), and R_eff=R_sphere=1 are the transition points

Next steps:

  • Plot R_eff=f(AR) for all AR
  • Compare with the Hill Tan theory (see Deepak's paper) by looking at s_k^1/s_k and s_c^1/s_c vs phi^1/phi (using non-averaged values). Use local values, not averages over big regions
  • problem: s_c cannot be computed b/c of nan's. THis is likely b/c SuperQuadricParticle::getInteractionWith does return an interaction if the radii overlap, not if the particles are in contace (Solved)

2020-9-2 Meeting notes Dariel 

  1. problem: s_c cannot be computed b/c of nan's. THis is likely b/c SuperQuadricParticle::getInteractionWith does return an interaction if the radii overlap, not if the particles are in contac (Solved).
    Casually, Jurgen Besten emailed me reporting the same issue yesterday.
    There was a bug in getContactWithSuperQuad; it used to create a contact even when it did not exist.
  2. The spherical particles always have more kinetic energy in relation to the density than non-spherical particles no matter the direction where the segregation occurs. Thus, changes in contact stress gradient depending on the aspect ratio must be the cause of segregation direction flipping. Dariel Hern├índez Delfin will show that in next meeting.  
  3. Dariel Hern├índez Delfin should create smoother colormap fields using more time steps in the coarse-graining calculation. The segregation index will be more accurate.   
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