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titleSensitivity Analysis of Unsteady Flow Fields and Numerical Experiments for Optimal Measurement
Author(jpn)三坂, 孝志; 大林, 茂
Author(eng)Misaka, Takashi; Obayashi, Shigeru
Author Affiliation(jpn)東北大学流体科学研究所; 東北大学流体科学研究所
Author Affiliation(eng)Institute of Fluid Science, Tohoku University; Institute of Fluid Science, Tohoku University
Issue Date2013-11-30
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構特別資料
JAXA Special Publication
Start page209
End page215
Publication date2013-11-30
AbstractDifficulty 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.
Description形態: カラー図版あり
Meeting Information: 5th Symposium on Integrating CFD and Experiments in Aerodynamics (October 3-5, 2012, Chofu Aerospace Center, Japan Aerospace Exploration Agency (JAXA)), Chofu, Tokyo, Japan
Physical characteristics: Original contains color illustrations
Keywordssensitivity analysis; 4D-Var; large-eddy simulation
Document TypeConference Paper
JAXA Category特別資料
NASA Subject CategoryFluid Mechanics and Thermodynamics
Report NoJAXA-SP-13-001E

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