First close-ups of accretion onto secondary

New Work

  • I created movies of the previous run that follow the secondary point particle, keeping it at the centre of the frame.

Summary of New Results

  • The new movies reveal structure around the accreting secondary.

Detailed Results

Binary run 96/116 with half softening length of old run 062/088
Damp116) Extrapolated hydro BCs, Multipole expansion Poisson BCs, ambient dyne/cm, ambient density g/cc.
(Stampede 1 normal 1024 cores, ~4 days wall time)
( cm, , 5 levels AMR)

Reference frame of secondary:
​2d density slice (zoomed)
​2d density slice (zoomed), edge-on

Note: I tried to make a similar movie of face-on temperature, but visit could not handle it (don't understand reason)

Now sliced through secondary:
​2d density slice (zoomed)
​2d density slice now with velocity vectors (zoomed)
​2d density slice edge-on (zoomed)

Now sliced through secondary, zoomed in 4x again:
​2d density slice (extra zoomed)
​2d density slice (extra zoomed)

Box frame (as shown in previous post):
​2d density slice zoomed
​2d density slice with mesh

Discussion

  • Something resembling an accretion disk forms.

Next Steps

  • Long run with maxlevel restricted to vicinity of primary and secondary (running on bluehive)
  • Run with maxlevel restricted to vicinity of primary and secondary AND max resolution doubled (relaxation run almost completed on stampede)
  • Output diagnostics including accretion rate onto secondary, drag force on secondary
  • Make AMR maxlevel region a function of time
  • Experiment with variations to "fiducial parameter values": initial separation, primary spin, accretion onto primary

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