Linear stability theory-based transition model using local variables for RANS simulations of transitional flow

A new computational fluid dynamics compatible transition model for the natural transition and laminar separation bubble transition is established in the way of twotransport-equation based on linear stability theory. One transport equation is introduced to describe the growth of the laminar kinetic energy in the boundary layer. Another transport equation for intermittency is built to trigger the transition by controlling the source term of turbulent kinetic energy equation. Finally, applying the two transport equations to Shear Stress Transport (SST) turbulence model completes a four-equation transition turbulence model. Comparisons of predictions using the new model with wind tunnel experiments of Schubauer & Klebanoff flat plate, S809 airfoil, Aerospatiale A airfoil and DLR-F5 wing validate the predictive qualities of the new transition turbulence model.