Hybrid Reynolds-Averaged Navier-Stokes and Kinetic Eddy Simulation of External and Internal Flows

A hybrid Reynolds-averaged Navier-Stokes and kinetic eddy simulation turbulence model is proposed for external and internal flow applications. This hybrid Reynolds-averaged Navier-Stokes and kinetic eddy simulation model solves Menter's k-omega-SST model near walls and switches to a kinetic eddy simulation model away from walls. The kinetic eddy simulation model solves directly for local turbulent kinetic energy and local turbulent length scales, thus alleviating the grid-spacing dependency found in other detached eddy simulation and hybrid Reynolds-averaged Navier-Stokes and large eddy simulation models. Within the hybrid Reynolds-averaged Navier-Stokes and kinetic eddy simulation model, four different options (a combination of two different blending functions and the use of realizability constraints to bound the kinetic eddy simulation model parameters) have been evaluated and studied for flows over airfoils (RAE2822, NACA0015) and a turbine vane configuration. Although all four options showed good correlation with the test data, blending k-omega-SST with kinetic eddy simulation using Menter's k-omega-SST F(2) function showed better predictions in separated flows than using the baseline k-omega-SST model.