Posts for the month of January 2022
CEE
Computing
- Extension on Frontera — no news, write an email to Chris Hempel?
- Parallel HDF5 (currently only being used for post-processing)
- Bug has been identified and debugging ongoing (Jonathan)
Jet paper
- Waiting for the OK to submit
- Do another run? Or two? If so, what?
- WD (as Run J6) but with flat profile? 10 x higher Mdot? Accretion off for simplicity? — but WD is almost order of magnitude more expensive because of jet speed
- MS star with flat profile? 10 x higher Mdot as with Run J5? Accretion off for simplicity?
EOS paper
New analysis
- Did unbound mass calculation for production runs 277 (MESA EoS without radiation) and 282 (gamma 5/3 ideal gas)
- Results are generally consistent with the previous results from Run 271 (higher ambient density, lower resolution MESA EOS) and Run 143 (old gamma 5/3 ideal gas run from our other papers)
- However, the difference between MESA EOS and gamma 5/3 runs is a bit larger
- Also, unbinding remains flatter and goes up more at the end — this must be due to the 7 times decrease in ambient density
- Note that these are not the final graphs because they include ambient gas, but the overall conclusions are unlikely to change
- Did the energy conservation analysis for both runs — we are under ~2% percent change
- This is what their separation curves look like
Status of runs
The plan is to compare 3 runs (277,282,283) which are identical except for the EOS:
- Run 277: MESA EOS (completed up to frame 247 on Stampede2)
- Run 282: Ideal gas gamma=5/3 EOS (completed up to frame 250 on Stampede2)
- Run 283: MESA EOS with recombination energy removed from EOS tables (completed up to frame 109 on Frontera)
- Run 276: MESA EOS with maxlevel increased by 1 compared to Run 277 (for convergence study — completed up to frame 47 on Frontera)
- Run 28?: MESA EOS with maxlevel reduced by 1 compared to Run 277 (for convergence study — not yet started on Frontera)
Next steps
- Mass unbinding analysis of Runs 277 and 282, as above but now with star material only (i.e. excluding the ambient)
- Extend Runs 277 and 282 — but for how long?
- Energy conservation
- Available SUs
- What more will we learn?
- Outflow through boundaries
- Do we trust it as much after reductions in softening radius?
- Extend Run 283 (but needs Frontera extension)
- Ionization/recombination analysis as done with Run 271, now for Run 277
Fermi Project Update January 2022
The journal article on overleaf is at: https://www.overleaf.com/3756433924fzhskcnhbkmz
What Else I Need to Do?
Results Section: fix labels on parameter sweep (Fig 2). Use the parameter names on the paper rather than in the code- Appendix B: currently has the relevant timescales and ratios written down, what I need to do is figure out which 4/5 parameters or ratios uniquely determine the output. Or influence the output the most.
- Appendix C: currently has density calculations (as function of radius). I need to copy my results showing technology as function of density. Then I need to use both of those to figure out technology as a function of radius.
What Is Left?
- send out the paper to collaborators for review
- write introduction, conclusion, and abstract