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http://dx.doi.org/10.5139/IJASS.2009.10.2.125

Navier-Stokes Simulation of Unsteady Rotor-Airframe Interaction with Momentum Source Method  

Kim, Young-Hwa (Department of Aerospace Engineering, KAIST)
Park, Seung-O (Department of Aerospace Engineering, KAIST)
Publication Information
International Journal of Aeronautical and Space Sciences / v.10, no.2, 2009 , pp. 125-133 More about this Journal
Abstract
To numerically simulate aerodynamics of rotor-airframe interaction in a rigorous manner, we need to solve the Navier-Stokes system for a rotor-airframe combination as a whole. This often imposes a serious computational burden since rotating blades and a stationary body have to be simultaneously dealt with. An efficient alternative is to adopt a momentum source method in which the action of rotor is approximated as momentum source over a rotor disc plane in a stationary computational domain. This makes the simulation much simpler. For unsteady simulation, the instantaneous momentum sources are assigned only to a portion of disk plane corresponding to blade passage. The momentum source is obtained by using blade element theory with dynamic inflow model. Computations are carried out for the simple rotor-airframe model (the Georgia Tech model) and the results of the simulation are compared with those of the full Navier-Stokes simulation with moving mesh system for rotor and with experimental data. It is shown that the present simulation yields results as good as those of the full Navier-Stokes simulation.
Keywords
Momentum Source Method; Rotor-Airframe Interaction; Unsteady Navier-Stokes Simulation; Blade Element Theory; Moving Mesh;
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