Posts for the month of April 2021

HEDP Simulations

Results

There were 4 sequences of runs to compare the effect of

  • Cooling vs no cooling on fiducial data
  • Effect of magnetic field with cooling
  • Effect of changes in magnetic diffusion length (for cooling and 2X fiducial field)
  • Effect of changing the cooling length from .1 to 10x for the 2X fiducial field with ½ the fiducial diffusion length

Reference Image

First comparison is the fiducial setup but with and without cooling

With cooling
Without cooling

Next we just used cooling but adjusted the magnetic field from 1.75 T to 14 T in multiples of 2

1.75 T
3.5 T
7 T
14 T

We then looked at the 7T case and explored the effect of diffusion comparing the case with no diffusion, ½ the fiducial, the fiducial, and 10X the fiducial lengths

0
.366 mm (½ fiducial)
.732 mm (fiducial)
7.32 mm (10 * fiducial)

And finally we looked at the effect of changing the cooling in the 7T half diffusion length case

.1 cooling
½ cooling
fiducial cooling
2x cooling
10x cooling

Dust in AstroBEAR - Update 2021/04/26

Objectives

  • Thesis stuff
  • Debugging & Testing

Progress:

  • still mainly busy writing/correcting thesis chapters
  • setting up new problem setup to reproduce Slavin+2020. Simulation is currently in the queue, no videos to show yet but I've plotted the initial density profile here. Velocity and temperature profile are still a work in progress, currently trying to find the best fits to reproduce observations.

Next Steps:

  • writing, writing, writing
  • potentially further work with the setup, have to discuss with supervisor

Fermi Project Update: March 2021

As a reminder, we had previously made the probe ranges and velocities normally distributed by introducing another variable called technology, making this normally distributed through random walks, then making the probe range and velocity relativistic functions of technology.  

Click here for a blogpost describing this process in more detail with movies/gifs of the models output.

The current goal we have been working on is introducing a fixed probability of civilization destruction per timestep for the civilizations.  We ended up accomplishing this by making the civilization lifetime exponentially distributed, analogous to how we had previously had the abiogenesis time exponentially distributed.

Click here for a summary of this and some parameter sweeps.