The authors provide observations from the AIAA Drag Prediction Workshops that have spanned over a decade and from a recent validation experiment at NASA Langley. These workshops provide an assessment of the predictive capability of forces and moments, focused on drag, for transonic transport. It is very difficult to manage the consistency of results in a workshop setting to perform verification and validation at the scientific level, but it may be sufficient to assess it at the level of practice. Observations thus far: (1) due to simplifications in the workshop test cases, wind tunnel data are not necessarily 'correct' results that CFD should match; (2) an average of core CFD data are not necessarily a better estimate of the true solution as it is merely an average of other solutions and has many coupled sources of variation; (3) outlier solutions should be investigated and understood; and (4) the DPW series does not have the systematic build up and definition on both the computational and experimental side that is required for detailed verification and validation. Several observations regarding the importance of the grid, effects of physical modeling, benefits of open forums, and guidance for validation experiments are discussed. The increased variation in results when predicting regions of flow separation and increased variation due to interaction effects, e.g., fuselage and horizontal tail, point out the need for validation data sets for these important flow phenomena. Experiences with a recent validation experiment at NASA Langley are included to provide guidance on validation experiments.
Observations on CFD Verification and Validation from the AIAA Drag Prediction Workshops
2014
21 pages
Report
No indication
English
British Library Conference Proceedings | 2014
|Drag Prediction Workshops IV and V
AIAA | 2014
SPECIAL SECTION: DRAG PREDICTION WORKSHOP - Drag Prediction Workshops IV and V
Online Contents | 2014
|