RANS Simulation of the Transitional Flow Around Airfoils at Low Reynolds Numbers for Steady and Unsteady Onset Conditions

摘要

RANS computations around airfoils are presented for flows where transition takes place across a laminar separation bubble. Transition locations are found employing the e(exp N)-method and a linear stability solver that uses the velocity and temperature profiles from the RANS-solution. Hereby, the known e(exp N)-method is applied for the flows with steady onset conditions, whereas a new temporal scheme for the e(exp N)-method is used for the flow around a plunging airfoil. Obtained numerical results are compared to hotwire-, pressure- and PIV- measurements of laminar separation bubbles.