Eilmer: An open-source multi-physics hypersonic flow solver

This paper introduces Eilmer, a general-purpose open-source compressible flow solver developed at the University of Queensland, designed to support research calculations in hypersonics and high-speed aerothermodynamics. Eilmer has broad userbase several university groups wide range capabilities, which are documented on project's website, accompanying reference manuals, an extensive catalogue example simulations. The first part this describes formulation code: equations, physical models, numerical methods that used basic fluid dynamics simulation, as well handful optional multi-physics models commonly added do hypersonic flow. second section processes develop maintain code, documenting our adherence good programming practice endorsing certain techniques seem be particularly helpful for scientific codes. final half-dozen simulations span Eilmer's each consisting some sample results short explanation problem being solved, together will hopefully assist new users beginning use their own projects. Program Title: CPC Library link program files: https://doi.org/10.17632/gy2ds2fyxm.1 Developer's repository link: https://github.com/gdtk-uq/gdtk Code Ocean capsule: https://codeocean.com/capsule/7226427 Licensing provisions: GPLv3 Programming language: D, Lua Supplementary material: https://gdtk.uqcloud.net Nature problem: solves Navier-Stokes equations with particular emphasis flows speeds. code includes modelling high-temperature gas effects such chemical vibrational nonequilibrium. can simulation unsteady steady flows. Solution method: is implemented D [1] built finite-volume capable solving 2D 3D computational domains, discretised structured or unstructured grids. Grids may generated using built-in parametric scripting tool imported from commercial gridding software. inviscid fluxes computed reconstruction-evolution approach. In structured-grid mode, reconstruction stencils up fourth-order spatial accuracy available. unstructured-grid least-squares provides second-order accuracy. A variety flux calculators available code. Viscous compact For flows, explicit time-stepping low-order RK-family schemes available, along point-implicit Backward-Euler update scheme stiff systems equations. convergence greatly accelerated Jacobian-free Newton-Krylov scheme, seeks global minimum residuals series large pseudo-timesteps. Domain decomposition parallel execution both shared memory distributed techniques. Additional comments including restrictions unusual features: programmable interface pre-processing, post-processing user run-time customisations. enabled embedded interpreter language [2]. Run-time customisations include used-defined boundary conditions, source terms grid motion. Language web page: https://dlang.org/. https://www.lua.org/.