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- Flow separation
- Bluff bodies
- ** Hover download**
- Dynamic stall
- Vortical flow in rotor wakes
- Wake persistence for large numbers of revolutions**
- Blade/vortex interactions
- Rotor structural dynamics/aerodynamics/controls interactions
- Flexible/deformed rotor blade flows
- Vibratory loads
- Rotor wake/fuselage interactions
- Flow interaction with ground**
- Ground wash**
- Brownout
- ** Rotor/Airframe interaction with ground plane
- Acoustic loading
- Non-harmonic flow/rotor control
- Multi-rotor interactions (coaxial, etc.)
- Laminar to turbulent boundary layer transition flow
- Circulation and flow separation control**
- Active flow control
- Icing
- Ice accretion
- Ice shedding
- Performance impact
- Wind tunnel to flight scaling**
- Reynolds number
- ** Model characteristics
High Speed (Supersonic)
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