Abstract
Aerodynamic performance of an aircraft is affected when it is flying close to the ground, for example during take-off or landing. In order to estimate this effect, CFD simulations have been carried out over the SARAS Mk II aircraft configuration using an open source CFD solver with Spalart Allmaras (SA) turbulence model. The simulations were done for aircraft at different heights above the ground with flaps deployed and at different angles of attack with propeller power on. The take-off flap deflections of 15° and 20° and landing flap deflections of 30° and 35° were considered for the simulations. Power effects were modelled by using actuator disc model available in SU2. From the simulations, it is observed that, for all flap configurations and at all angles of attack studied, flying close to ground increases the lift of the aircraft, reduces drag and pitching moment. The factors of increase/reduction are used by the design group for better estimation of aircraft performance.
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