Abstract
► NLR7301 airfoil limit cycle oscillation studied using dettached eddy simulation. ► Hihg order low diffusion schemes used. ► Fully coupled fluid-Structural Interaction model employed. ► Predicted LCO amplitude and frequency agree excellently with experiments. ► No flow separation is found in the LCO.
This paper is to investigate the NLR7301 airfoil limit cycle oscillation (LCO) caused by the flow nonlinearity of the fluid-structural interaction using detached eddy simulation (DES) of turbulence. A low diffusion E-CUSP (LDE) scheme with 5th order WENO scheme is employed to calculate the inviscid fluxes. A fully conservative 4th order central differencing is used for the viscous terms. A fully coupled fluid-structural model is employed. The limited cycle oscillation (LCO) of the NLR7301 airfoil is simulated using DES method developed by Spalart et al. For the case computed in this paper, the predicted LCO agrees excellently with the experiment performed by Schewe et al. The solutions also show bifurcation and are dependent on the initial fields or initial perturbation. The developed computational fluid dynamics (CFD)/computational structure dynamics (CSD) simulation is able to capture the LCO with very small amplitudes measured in the experiment under the same conditions except that the computation is conducted in an unbounded field. This is attributed to the high order low diffusion schemes, fully coupled FSI model, and the DES method used.
