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Flash-X: A multiphysics simulation software instrument - 2022 In this article Flash-X is a highly composable multiphysics software system that can be used to simulate physical phenomena in several scientific domains. It derives some of its solvers from FLASH, which was first released in 2000. Flash-X has a new framework that relies on abstractions and asynchronous communications for performance portability across a range of increasingly heterogeneous hardware platforms. Flash-X is meant primarily for solving Eulerian formulations of applications with compressible and/or incompressible reactive flows. It also has a built-in, versatile Lagrangian framework that can be used in many different ways, including implementing tracers, particle-in-cell simulations, and immersed boundary methods. Flash-X is avaliable here, and documentation is here. Implementation of inheritance. Ye profiles post bounce in core-collapse. FLASH: An Adaptive Mesh Hydrodynamics Code for Modeling Astrophysical Thermonuclear Flashes - 2000 In this article, we report on the completion of the first version of a new-generation simulation code, FLASH. The FLASH code solves the fully compressible, reactive hydrodynamic equations and allows for the use of adaptive mesh refinement. It also contains state-of-the-art modules for the equations of state and thermonuclear reaction networks. The FLASH code was developed to study the problems of nuclear flashes on the surfaces of neutron stars and white dwarfs, as well as in the interior of white dwarfs. We expect, however, that the FLASH code will be useful for solving a wide variety of other problems. This first version of the code has been subjected to a large variety of test cases and is currently being used for production simulations of X-ray bursts, Rayleigh-Taylor and Richtmyer-Meshkov instabilities, and thermonuclear flame fronts. The FLASH code is portable and already runs on a wide variety of massively parallel machines, including some of the largest machines now extant. The first bare-knuckles version of FLASH was created by Kevin Olson (he had PARAMESH and his hands on the keyboard), Bruce Fryxell (he had the hydro), and me (had the local physics) in late 1998 in the Laboratory for Astrophysics and Space Research (LASR) building where Kevin and I shared an office. We had some nifty SGI O2 desktop computers at the time. Shortly thereafter Paul Ricker (had the gravity) and Mike Zingale (had the viz and all-purpose skills) added critical capabilities. Jonathan Dursi and Alan Calder made key contributions and gave the development team a critical mass.