Reduced-order modeling and analysis of unsteady rotor hub flows

Tristan Wall, James G. Coder

Research output: Contribution to conferencePaperpeer-review

5 Scopus citations


Modal Decomposition is used to characterize high-fidelity flow fields for several different helicopter rotor hub variations in forward flight. Computational Fluid Dynamics (CFD) are carried out using the NASA OVERFLOW 2.2, Reynolds averaged Navier-Stokes solver. The simulated flow conditions and computational grids are based on experiments performed in a water tunnel at flight-relevant Reynolds numbers. The grids and computational methods used are discussed in further detail. Fast Fourier Transforms (FFT) are used to examine the force harmonics on the the surfaces of various hubs, revealing a dependence on geometric forcing. Mean-subtracted, space-only POD of the predicted lift and drag show a slow decay of modal energy, implying that a large number of modes is necessary to model the rotor hub. Space-only POD and Spectral Proper Orthogonal Decomposition (SPOD) are also used in an attempt to isolate and identify coherent flow structures in the rotor hub wake.

Original languageEnglish (US)
StatePublished - 2020
EventVertical Flight Society's 76th Annual Forum and Technology Display - Virtual, Online
Duration: Oct 5 2020Oct 8 2020


ConferenceVertical Flight Society's 76th Annual Forum and Technology Display
CityVirtual, Online

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Control and Systems Engineering


Dive into the research topics of 'Reduced-order modeling and analysis of unsteady rotor hub flows'. Together they form a unique fingerprint.

Cite this