1.2. Code Approach

1) Governing Equations

GASFLOW is a parallel multiphase all-speed CFD code that solves the time-dependent, 3D, compressible Navier-Stokes equations using the finite volume method. Transport equations for the internal energy and for gas species, chemical reactions, liquid droplet species, and multi aerosol sizes are also solved.

2) Solution Algorithm

A linearized Arbitrary-Lagrangian-Eulerian method is used for approximating the solution to the coupled mass, momentum, and energy conservation equations. The implicit, iterative pressure computation in this method, which uses the efficient linear solvers and pre-conditioners, allows simulations of low Mach number, sonic and supersonic flows without the time-step restrictions that are caused by the fluid sound speed.