Wind turbine rotor blades in operation have been observed to undergo stall-induced lead-lag instabilities resulting in dramatic reduction of blade life, due to structural fatigue. Previous attempts to numerically simulate the flow past a translatoric oscillating airfoil have been few and feeble at the high angle of attacks often experienced by the individual rotor blade. The present paper covers simulation of a translatoric oscillating NACA 0015 airfoil at a Reynolds number of 555,000, corresponding to avialable experimental data, using the newly adopted Detached Eddy Simulation (DES) approach. The DES method difines a hybrid method combining Reynolds Averaged Navier-Stokes (RANS) in the attached boundary layer with Large Eddy Simulation (LES) in the outer separated regions, thus resolving largescaled transient turbulent motion. Comparison to existing unsteady k-w-SST RANS simulations and detailed experiments shows that DES improves the lift- and drag prediction along with improved realism in resolved flow fields.Results are presented for angel of attack of 15 eg. and translatoric oscillation angle of 5 deg. about the chord wise direction.See Figure 1. Low-frequency vortex shedding, corresponding to Strouhal numer St=0.02, were found from the DES, which is comparable to numerical and experimental results obtianed by others.
|Title of host publication||European Wind Energy Conference & Exhibition|
|Number of pages||9|
|Place of Publication||Proc. CD-ROM, www.ewea.org|
|Publisher||European Wind Energy Association (EWEA)|
|Publication status||Published - 2003|
|Event||2003 European Wind Energy Conference and Exhibition - Madrid, Spain|
Duration: 16 Jun 2003 → 19 Jun 2003
|Workshop||2003 European Wind Energy Conference and Exhibition|
|Period||16/06/2003 → 19/06/2003|
Reck, M., Hansen, M. O. L., & Sørensen, J. N. (2003). Investigation of flow past a translatoric oscillating airfoil using detached eddy simulation. In European Wind Energy Conference & Exhibition Proc. CD-ROM, www.ewea.org: European Wind Energy Association (EWEA).