A common platform for validation of aircraft drag reduction technologies

Aiming at being able to assess the different solutions, an evaluation of the interference drag and wave drag will be the main objective of the analysis.

Due to the inherent difficulty of assessing interference drag, only wave drag should be considered for the evaluation.

There are several approaches to extract the drag from a flow solution. The suggested methodology consists on evaluating the following shock_wave_flag variable on the flow field.

Then, we consider that all the momentum losses originated in the cells where shock_wave_flag >1.1 are considered wave drag and linked to the dissipation in the shock wave region.

With this methodology, we are not neglecting any drag contribution (the total drag remains unchanged), but we are flagging some regions as the only contributors to a specific drag decomposition.