COMPUTATIONAL FLUID DYNAMICS DRAG PREDICTION AND DECOMPOSITION FOR PROPULSIVE SYSTEM INTEGRATION

The prediction and decomposition of drag associated to Propulsive System Integration (PSI) is investigated applying a methodology based on entropy variations in the flow and the momentum conservation theorem. This advanced prediction method can decompose the total drag in to viscous, wave, induced and spurious drag, allowing a better understanding of the flow. The spurious drag, due to numerical errors, can be eliminated reducing the dependency of the solution on the grid quality. Four applications are presented: two wing-body configurations, a wing-body-nacelle-pylon with trough-flow-nacelle, and a wing-body-nacelle-pylon with a very-high-bypass-ratio engine in power-on condition. One objective is to minimize grid resolution to enable design optimization