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GASFLOW is a finite-volume code based on robust computational fluid dynamics numerical techniques that solve the compressible Navier-Stokes equations for 3D volumes in Cartesian or cylindrical coordinates.
The code can model geometrically complex facilities with multiple compartments and internal structures in a computational domain of multiple 3D blocks of cells connected by one-dimensional flow paths. GASFLOW has transport equations for multiple gas species, liquid water droplets, and total fluid internal energy. A built-in library contains 23 gas species and 1 liquid water species. GASFLOW can simulate the effects of two-phase dynamics with the homogeneous equilibrium model, two-phase heat transfer (steam condensation and water evaporation) to walls and internal structures, chemical kinetics from catalytic hydrogen recombination and combustion processes, and fluid turbulence. The code can model two-phase heat transfer to and from walls and internal structures by convection and mass diffusion. Wall shear stress models are provided for bulk laminar and turbulent flow.
Two turbulence models available: algebraic and κ-ε, which provide zero- and two-transportequation models, respectively, that determine turbulent velocity and length scales needed to compute the turbulent viscosity. Terms for the turbulent diffusion of different species are included in the mass and internal energy equations.
A catalytic hydrogen combination with oxygen is modeled using data from both the Nuclear Ingenieur Service and Siemens recombiner box designs. The aerosol model comprises the following models: Lagrangian discrete particle transport, stochastic turbulent particle diffusion, particle deposition, particle entrainment, and particle cloud. These models incorporate the physics of particle behavior to model discrete particle phenomena and allow the code user to track the transport, deposition, and entrainment of discrete particles, as well as clouds of particles.
Download the complete Theory Manual.