TNG

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Tree algorithm parameters

Arti Flinkerbusch
  • 6 Sep

Hi,

I have some questions about TNG-Cluster's tree algorithm which is used to compute gravity at short range. To what order is the multipole expansion applied to tree nodes? What is the threshold number of particles that a tree node may have, above which it's split into smaller nodes? Are these parameters the same as for the other IllustrisTNG simulations?

Thanks in advance,
Arti

Dylan Nelson
  • 8 Sep

Yes all these parameters are the same for TNG-Cluster as for all IllustrisTNG simulations, and also for most other simulations run with AREPO and GADGET over the past decade. You can find details in e.g. the AREPO (or GADGET) code paper(s) and public code release(s). The relevant numerical parameters are, for example,

TypeOfOpeningCriterion                1
ErrTolTheta                           0.7
ErrTolForceAcc                        0.0025
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