Unsteady airloads predictions from a hybrid Navier-Stokes/full-potential code for a model UH-60A rotor in forward flight are presented. The code splits the physical domain into a near blade viscous region surrounded by an inviscid potential region. The two regions are coupled through boundary conditions on the interface surface seperating them. In addition, the interface surface has been modified to dynamically adjust its position normal to the blade surface depending on the instantaneous distribution of vorticity in the viscous region. This allows roughly a 50 percent reduction of CPU time usage when compared with a standalone Navier-Stokes code. Comparison of the hybrid code surface pressures with the standalone Navier-Stokes results shows good agreement in quadrants one, two, and four. The hybrid code overpredicts the extent of a separated region in the third quadrant which suggests further improvements to the unsteady interface boundary conditions are needed.
Forward flight rotor airloads predictions using a coupled Navier-Stokes/full-potential analysis
Die Voraussage der Rotorbelastungen im Vorwärtsflug durch eine gekoppelte Navier-Stokes/Vollbelastungs-Analyse
1995
10 Seiten, 11 Bilder, 13 Quellen
Aufsatz (Konferenz)
Englisch
Forward Flight Rotor Airloads Predictions using a Coupled Navier-Stokes/Full-Potential Analysis
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