Sensitivity Analysis of Unsteady Flow Fields and Numerical Experiments for Optimal Measurement

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5th Symposium on Integrating CFD and Experiments in Aerodynamics (October 3-5, 2012, Chofu Aerospace Center, Japan Aerospace Exploration Agency (JAXA)), Chofu, Tokyo, Japan

Difficulty of data assimilation arises from a large difference between the sizes of a state vector to be determined, i.e., the number of spatiotemporal grid points of a discretized numerical model, and a measurement vector, i.e., amount of measurement data. Flow variables on a large number of grid points are hardly defined by spatiotemporally limited amount of measurement data that poses an underdetermined problem. In this study we conduct sensitivity analysis of a vortex flow field by the use of an adjoint method. The idea of optimal/targeted observation in meteorology which aim to effectively determine a flow state by limited observations is interpreted in fluid dynamic problems where unsteady flows of much smaller scales are of interest.

形態: カラー図版あり

Physical characteristics: Original contains color illustrations

資料番号: AA0062070015

レポート番号: JAXA-SP-13-001E

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