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High Resolution Wake Capturing Methodology for Hovering Rotors Karthikeyan Duraisamy

Summary: High Resolution Wake Capturing Methodology for Hovering Rotors
Karthikeyan Duraisamy
James D. Baeder
Research Scientist Associate Professor
Alfred Gessow Rotorcraft Center
University of Maryland at College Park
College Park, MD
A high-resolution Reynolds-averaged Navier­Stokes (RANS) solver is applied to study the evolution of tip vortices from
rotary blades. The numerical error is reduced by using high-order accurate schemes on appropriately refined meshes. To
better resolve the vortex evolution, the equations were solved on multiple overset grids that ensured adequate resolution in
an efficient manner. For the RANS closure, a one equation wall-based turbulence model was used with a correction to the
production term to account for the stabilizing effects of rotation in the core of the tip vortex. While experimental comparison
of the computed vortex structure beyond a few chord lengths downstream of the trailing edge is lacking in the literature,
reasonable validation of the vortex velocity profiles is demonstrated up to a distance of 50 chord lengths of evolution for a
single-bladed rotor. For the two-bladed rotor case, the tip vortex could be tracked up to two rotor revolutions with minimal
diffusion. The accuracy of the computed blade pressures and vortex trajectories confirm that the inflow distribution and
blade-vortex interaction are represented correctly. The accuracy achieved in the validation studies establishes the viability
of the methodology as a reliable tool that can be used to predict vortex evolution and the aerodynamic performance of
hovering rotors.


Source: Alonso, Juan J. - Department of Aeronautics and Astronautics, Stanford University


Collections: Engineering