Numerical simulation of explosion phenomena in industrial environments (original) (raw)

The code REACFLOW developed at the JRC Ispra combines advanced numerical techniques for the simulation of transient, multi-dimensional, multi-component gas flows undergoing chemical reactions to a unique tool. It uses a true 2-D discretisation with an unstructured triangular grid to ensure a maximum of flexibility for the representation of complex geometries. The numerical discretisation uses a finite volume scheme based on an approximate Riemann solver. Explicit, implicit and semi-implicit methods cover the whole range of time scales. Compressible and incompressible flow is treated with an arbitrary number of components. Chemical reactions are calculated fully implicitly. Diffusion processes are also modelled using a finite volume equivalence to the finite element Galerkin method. A k-e turbulence model is currently being implemented. A system for dynamic grid adaptation automatically detects locations of refinement and coarsement based on local gradients of flow variables. The code capability will be demonstrated by various applications, including a hydrogen/air explosion in a containment and a 'tulip' flame calculation.