Vortex Preserving and Consistent Large Eddy Simulations for Naval Applications

An integrated program of fundamental research, software development and technology transition to Navy target platforms for computationally efficient yet accurate prediction of turbulence interactions involving disparate length scales has been proposed and is underway. The fundamental research will be conducted at Purdue University and provide a critical modeling component for turbulence resolving simulation in Navy relevant but challenging applications. The fundamental research focuses on assessing the suitability of existing prominent subgrid scale models and enhancing them for Navy applications, and developing new models that better meet these challenges. Central to the present study is sustaining the strength and structure of vortices in the midst of artificial dissipation and dispersion of the underlying numerical schemes. Moreover, grid coarsening in regions of large scale turbulence adds to the dissipative property of the schemes and undesired grid dependency of conventional turbulence models. In this program, a consistent Large Eddy Simulation (LES) turbulence model that is grid independent and numerical scheme independent will be further enhanced to meet more challenging applications. Parallel to this effort, an adaptive discretization method that counteracts the dissipation of the numerical schemes will be extended to function in concert with the novel consistent LES method, either in a zonal