Castro

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Diffusion of species concentration in Castro

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My understanding is that Castro currently implements [diffusion of temperature](https://amrex-astro.github.io/Castro/docs/diffusion.html) (i.e. a fluid with areas of hot and cold temperatures will evolve towards a uniform temperature eventually), but not yet...

RemiLehe

[WIP] Inflow bcs

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## PR summary This implements inflow BCs using the one-sided stencils at the inflow boundary. ## PR motivation ## PR checklist - [ ] test suite needs to be run...

zingale

this switches to piecewise constant interpolation at jumps also use the EOS for the transverse fluxes ## PR summary ## PR motivation ## PR checklist - [ ] test suite...

zingale

consider bumping language standard to C++20

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There are some nice string features, ranges, and the format library that we could use with C++20. We should not rely on these in GPU code at the moment. Testing...

zingale