Implementation and assessment of the renormalization group (RNG), quadratic and cubic non-linear eddy viscosity k-ε models in GOTHIC

摘要

In GOTHIC, the standard k-ε model is used to model turbulence. However, for practical reasons, one usually employs relatively large meshes near physical boundaries (walls). In an attempt to enhance the turbulence modelling in the code for simulation of mixing driven by highly buoyant discharges, in the framework of this simplified approach appropriate for containment analysis code, we have implemented three additional models which are modifications/extensions of the standard k-ε model: the renormalization group k-ε model, and the non-linear (quadratic and cubic) eddy viscosity k-εmodels.