The FLASH code is a publicly available high performance application code which has evolved into a modular, extensible software system from a collection of unconnected legacy codes. FLASH consists of inter-operable modules that can be combined to generate different applications. The FLASH architecture allows arbitrarily many alternative implementations of its components to co-exist and interchange with each other. A simple and elegant mechanism exists for customization of code functionality without the need to modify the core implementation of the source. A built-in unit test framework combined with regression tests that run nightly on multiple platforms verify the code.

FLASH CAPABILITIES

Physics Solvers :
Hydrodynamics: Unsplit PPM and WENO; Split PPM; 2T+Radiation
Magnetohydrodynamics: Unsplit Staggered Mesh; Split 8 wave
Equation of State: Ideal gas; Degenerate Ionized Plasma; Multimaterial
Radiation Transfer: Multigroup Flux-limited Diffusion
Diffusion and Conduction: Implicit with AMR
Laser Energy Deposition: Geometric Optics with Inverse Brensstrahlung
Quiet Start
Opacity: Constant; Multimaterial Tabular
Particles: Tracer; Massive; Sink; Charged
Nuclear Burning
Gravity: Constant; PointMass; Planar; Self Gravity
Cosmology
Magnetic Resistivity, Conductivity
Primordial Chemistry
Simulated Diagnostics: Proton Radiography; Thomson Scattering

Infrastructure :
Driver: Split; Unsplit
Grid: Uniform Grid; AMR (PARAMESH); AMR (Chombo)
GridParticles: Lagrangian Framework
GridSolvers: Multigrid; Multipole; Barnes-Hut Tree; PFFT; Direct Solvers for Uniform Grid
IO: HDF5 ; PnetCDF
Multispecies
RuntimeParameters
Monitor: MPI Timers; Hooks for TAU