A new atomic mix model library available in HYDRA*

A new library of Reynolds Averaged Navier Stokes (RANS) mix models is now available in HYDRA.  The RANSBox library, developed at LLNL, currently implements 17 RANS atomic mix models.  These include KL-type models, K-epsilon, BHR-2 and BHR-3.1.  These augment the existing set of atomic mix models available in HYDRA.  These models are intended as an option for modelling instability growth at specific interfaces where stabilization due to ablation is absent.  RANS models have been applied to a variety of experiments where turbulent mix may occur.  For an embedded interface in a cryogenic ICF capsule, in which a variety of stabilization mechanisms reduce instability growth, direct simulation of multimode hydrodynamic instabilities is considered to be the most predictive.  For these targets a RANS model may serve as a reduced model for high mode mix phenomena incorporated in a low-resolution simulation.  These models are available for 1, 2 and 3 dimensional problems for all mesh types.  We will examine how the extent of mixing obtained with particular RANS models compares with high resolution direct simulations for specific capsule designs.