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We have decided to analyze the accretion onto a neutron star just up until the hydrogen burning begins. We'll first attempt this as an adaptation to the Bondi accretion problem with a solid sphere near the origin (also relevant to the problem of infall onto the proto-neutron star during core collapse). If we're successful, we'll try an accretion disk in 2D with polar geometry.
Determined to be outside scope of project.
* [ ] Determine the input abundances
* [ ] Build the nuclear network for the problem
* [ ] Take output from the codes
* [ ]determine when hydrogen burning begins
* [ ]analyze data values to optimize scale(linear vs log) and ranges(0-?) for visualization
Link to Code on GitHub: External Link
1D on a solid surface was successful so the 2D case was the bulk of the project work. The solid case was unstable and resulted in an non-physical explosion. Both the infall and reflective cases were attempted, we found the [] to be optimal. We were able to model a non-viscous and viscous case using hydronamic force and energy equation. Terms for the extremely large B field (10^7-8 T) were not included. Both accreted around the central mass with a large high pressure/empty barrier for the non-viscous case, as the angular momentum is not dissipated. The viscous case correctly accreted on to the surface.
video of non viscous accretion video of viscous accretion video of accidental zero pressure accretion
References:
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