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Japan Aerospace Exploration Agency

Technologies for EFD/CFD integration

Recent advances in measurement and numerical analysis methods have sparked astounding improvements in the productivity of EFD (wind tunnel testing) and CFD (computational fluid dynamics) data. Still, there are few systematic methods that integrate the data and help understand fluid phenomena or facilitate design development. There are also few methods to evaluate the accuracy of the data.

At JAXA, work is presently underway to apply data assimilation technology - a long-standing topic for research and development in statistical mathematics - to make physical models (turbulence models, etc.) more sophisticated and improve the accuracy of aerodynamic characteristic predictions for aircraft and spacecraft. The further objective is analyzing large-scale EFD/CFD data in a complementary, fusion-centric way, extracting useful information, applying findings toward a better understanding of fluid phenomena, and working to guarantee the accuracy of aerodynamic characteristics by estimating maximum likelihood values and uncertainty ranges.

Three-dimensional transonic flow data assimilation using the ensemble Kalman filter
(using surface pressure measurements for assimilation)