Structured, overset computational fluid dynamics methods are used to simulate a water-tunnel experiment of flow over a rotating, 4-bladed rotor hub at Reynolds numbers near that of full scale. A hybrid RANS/LES method is employed with fifth-order discretization of convective flux terms and second-order time integration to resolve largescale turbulent flow features in the wake. Preliminary simulations on a baseline grid system revealed inadequate grid resolution in the wake region along with contamination from inflow and outflow boundaries being too close to the region of interest. An improved grid system was made based on the lessons learned, and results obtained for this grid are described in detail. Comparison of time-averaged velocities in the wake show an underprediction of the velocity deficit in the mid and far wakes. Frequency spectra of the hub drag loads and downstream wake velocities are presented and compared with experiment.
|Original language||English (US)|
|Number of pages||10|
|Journal||Annual Forum Proceedings - AHS International|
|State||Published - 2017|
|Event||73rd American Helicopter Society International Annual Forum and Technology Display 2017 - Fort Worth, United States|
Duration: May 9 2017 → May 11 2017
All Science Journal Classification (ASJC) codes