AMReX-Astro/Microphysics

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common astrophysical microphysics routines with interfaces for the different AMReX codes

Stars: 43
Forks: 46
Open beginner issues: 0
Indexed issues: 64
Avg merge: 2d 18h
Merged PRs (30d): 15

Dominant language: C++
License: No license data
Last GitHub push: Sep 1, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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64 open issues indexed

Debye-Huckel shortcut creates a discontinuous screening factor Open

ai-code-audit screening

Difficulty 4/5 3-5 days Newbie friendliness 55/100

AMReX-Astro/Microphysics#2097 · 1 comment · Opened Sep 14, 2026
Screening temperature derivatives do not differentiate the returned value Open

ai-code-audit screening

Difficulty 4/5 3-5 days Newbie friendliness 72/100

AMReX-Astro/Microphysics#2096 · Opened Sep 14, 2026
Approximate arctangent introduces jumps in screening free energies Open

ai-code-audit screening

Difficulty 4/5 3-5 days Newbie friendliness 66/100

AMReX-Astro/Microphysics#2095 · 1 comment · Opened Sep 14, 2026
Documented Debye-Huckel screening option cannot be built Open

ai-code-audit screening

Difficulty 3/5 1-2 days Newbie friendliness 88/100

AMReX-Astro/Microphysics#2094 · Opened Sep 14, 2026
NSE derivatives remain nonzero outside the clamped table domain Open

ai-code-audit nse

Difficulty 3/5 1-2 days Newbie friendliness 68/100

AMReX-Astro/Microphysics#2075 · Opened Sep 8, 2026
NSE EOS Jacobians use cubic derivatives when linear interpolation is selected Open

ai-code-audit nse

Difficulty 4/5 3-5 days Newbie friendliness 74/100

AMReX-Astro/Microphysics#2074 · Opened Sep 8, 2026
Cubic NSE interpolation can turn neutrino cooling into heating Open

ai-code-audit nse

Difficulty 3/5 1-2 days Newbie friendliness 72/100

AMReX-Astro/Microphysics#2072 · 2 comments · Opened Sep 8, 2026
The default energy inversion does not report iteration exhaustion Open

ai-code-audit nse

AMReX-Astro/Microphysics#2071 · 1 comment · 1 assignee · Opened Sep 7, 2026
nse_solver: The energy Jacobian differentiates at fixed Ye, but the residual does not Open

ai-code-audit nse

AMReX-Astro/Microphysics#2070 · 1 assignee · Opened Sep 7, 2026
SDC cleanup normalizes invalid species before checking for burn failure Open

ai-code-audit integrator sdc

Difficulty 3/5 1-2 days Newbie friendliness 68/100

AMReX-Astro/Microphysics#2066 · Opened Sep 7, 2026
SDC temperature cutoff discards advective sources as well as reactions Open

ai-code-audit integrator

Difficulty 3/5 1-2 days Newbie friendliness 76/100

AMReX-Astro/Microphysics#2059 · Opened Sep 7, 2026
VODE numerical Jacobian corrupts later columns when abundances are renormalized Open

ai-code-audit integrator

Difficulty 3/5 1-2 days Newbie friendliness 72/100

AMReX-Astro/Microphysics#2058 · 1 comment · Opened Sep 7, 2026
Duplicate reactant/product species not accumulated correctly in generic RHS Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

AMReX-Astro/Microphysics#2053 · Opened Sep 5, 2026
experiment with AMReX_CompensatedSum.H Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

AMReX-Astro/Microphysics#2043 · Opened Aug 11, 2026
add state checks for SDC to Rosenbrock Open

integrator

Difficulty 3/5 1-2 days Newbie friendliness 58/100

AMReX-Astro/Microphysics#2019 · Opened Jun 20, 2026
are we filling y_e in the burn_state that get's passed to the nets? Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

AMReX-Astro/Microphysics#1980 · Opened Apr 23, 2026
try QSS for primordial chem Open

enhancement

AMReX-Astro/Microphysics#1972 · 3 comments · 1 assignee · Opened Mar 27, 2026
util/hybrj: invalid xtol currently hard-aborts instead of returning solver status Open

ai-code-audit

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

AMReX-Astro/Microphysics#1961 · Opened Mar 11, 2026
util/hybrj: NaN/Inf handling in enorm can cause false convergence Open

ai-code-audit

Difficulty 4/5 3-5 days Newbie friendliness 35/100

AMReX-Astro/Microphysics#1960 · Opened Mar 11, 2026
RKC: actual_integrator.H and actual_integrator_sdc.H share the same include guard Open

ai-code-audit integrator

Difficulty 1/5 Under an hour Newbie friendliness 68/100

AMReX-Astro/Microphysics#1954 · Opened Mar 5, 2026
he-burn approximate rates need denominator guard Open

ai-code-audit

Difficulty 4/5 3-5 days Newbie friendliness 45/100

AMReX-Astro/Microphysics#1947 · 1 comment · Opened Mar 3, 2026
RHS Jacobian filter includes intermediate reactions Open

ai-code-audit

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

AMReX-Astro/Microphysics#1945 · Opened Mar 3, 2026
cj_detonation density grid mismatch and missing Finalize Open

ai-code-audit

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

AMReX-Astro/Microphysics#1944 · Opened Mar 3, 2026
metal_chem parser OOB on blank/comment lines Open

ai-code-audit

AMReX-Astro/Microphysics#1943 · 1 assignee · Opened Mar 3, 2026
switch NSE to use constexpr_for on bion and mion Open

nse

Difficulty 4/5 3-5 days Newbie friendliness 38/100

AMReX-Astro/Microphysics#1897 · Opened Dec 12, 2025
adopt logo Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

AMReX-Astro/Microphysics#1838 · Opened Jul 15, 2025
consider implementing Stoichiometry-compatible Reconstruction Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

AMReX-Astro/Microphysics#1816 · Opened Jun 24, 2025
consider simplifying the NSE table integration Open

integrator nse sdc

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1814 · Opened Jun 23, 2025
implement 2nd order RKC with monotone stability Open

integrator

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1800 · 1 comment · Opened Jun 5, 2025
Add new components for radiation energy density Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1775 · 51 comments · Opened Mar 12, 2025
Missing extern_parameters.cpp when compiling burn_cell in DEBUG mode Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

AMReX-Astro/Microphysics#1774 · 5 comments · Opened Mar 5, 2025
Allow using BackwardEuler integrator instead of VODE Open

integrator

Difficulty 3/5 1-2 days Newbie friendliness 45/100

AMReX-Astro/Microphysics#1772 · Opened Mar 3, 2025
burn_cell_[metal,primordial]_chem redefines primary_species_* to be real Open

AMReX-Astro/Microphysics#1748 · 1 assignee · Opened Feb 11, 2025
add the explicit Patankar-Euler-Deflhard integrator Open

integrator

Difficulty 5/5 Over a week Newbie friendliness 20/100

AMReX-Astro/Microphysics#1720 · 1 comment · Opened Jan 15, 2025
loop over cells in order by cost to reduce divergence Open

enhancement GPU reactions

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1683 · Opened Dec 8, 2024
templating integrator functions on NumSpec, actual_rhs Open

enhancement integrator

Difficulty 5/5 Over a week Newbie friendliness 28/100

AMReX-Astro/Microphysics#1657 · 2 comments · Opened Oct 3, 2024
consider adopting SmallMatrix Open

enhancement integrator

Difficulty 5/5 Over a week Newbie friendliness 15/100

AMReX-Astro/Microphysics#1656 · 1 comment · Opened Oct 1, 2024
Implement cosmic ray attenuation Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 20/100

AMReX-Astro/Microphysics#1653 · Opened Sep 18, 2024
Fix bug in primordial chemistry chemical heating Open

bug

AMReX-Astro/Microphysics#1641 · 1 assignee · Opened Aug 21, 2024
lower the default ode_max_steps Open

integrator

Difficulty 3/5 1-2 days Newbie friendliness 35/100

AMReX-Astro/Microphysics#1634 · Opened Jul 29, 2024
add ideal gas EOS with tabulated mean molecular weight Open

enhancement EOS

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1488 · 2 comments · Opened Feb 20, 2024
use std::expected to handle burn failures? Open

enhancement integrator reactions

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1439 · 4 comments · Opened Jan 3, 2024
add option to skip neutrino cooling if it is insignificant Open

reactions student project

Difficulty 4/5 3-5 days Newbie friendliness 42/100

AMReX-Astro/Microphysics#1333 · Opened Sep 12, 2023
Compile-time RHS evaluation should have a pretty print option Open

enhancement reactions

AMReX-Astro/Microphysics#1324 · 1 assignee · Opened Sep 9, 2023
can we operator split within VODE? Open

integrator

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1314 · 1 comment · Opened Aug 19, 2023
regenerate the helmtable without needing std::log10 Open

EOS

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1258 · 3 comments · Opened Jul 5, 2023
what's the purpose of integrate_energy now? Open

integrator

Difficulty 4/5 3-5 days Newbie friendliness 30/100

AMReX-Astro/Microphysics#1215 · 1 comment · Opened Jun 13, 2023
switch Strang integration to work with (rho X, rho e) Open

integrator

Difficulty 4/5 3-5 days Newbie friendliness 35/100

AMReX-Astro/Microphysics#1200 · 3 comments · Opened May 31, 2023
reintroduce the idea of multiple integrators Open

integrator

Difficulty 5/5 Over a week Newbie friendliness 25/100

AMReX-Astro/Microphysics#1197 · 1 reaction · Opened May 24, 2023
consider changing rhs() interface in integrator to pass y instead of integrator type Open

integrator

Difficulty 4/5 3-5 days Newbie friendliness 35/100

AMReX-Astro/Microphysics#1192 · 2 comments · Opened May 21, 2023

AMReX-Astro/Microphysics

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